fix: mobile adjustments

update: add data-storage warnings to the app

Cargo.lock

@@ -43,6 +43,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "approx"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cab112f0a86d568ea0e627cc1d6be74a1e9cd55214684db5561995f6dad897c6"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "arrayvec"
 version = "0.7.6"
@@ -443,6 +452,7 @@ dependencies = [
  "ryu",
  "serde",
  "serde_json",
+ "statrs",
 ]
 
 [[package]]
@@ -965,6 +975,16 @@ version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "38b58827f4464d87d377d175e90bf58eb00fd8716ff0a62f80356b5e61555d0d"
 
+[[package]]
+name = "statrs"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a3fe7c28c6512e766b0874335db33c94ad7b8f9054228ae1c2abd47ce7d335e"
+dependencies = [
+ "approx",
+ "num-traits",
+]
+
 [[package]]
 name = "subtle"
 version = "2.5.0"

base/Cargo.toml

@@ -19,6 +19,7 @@ regex = { version = "1.0", optional = true}
 regex-lite = { version = "0.1.6", optional = true}
 bitcode = "0.6.3"
 csv = "1.3.0"
+statrs = { version = "0.18.0", default-features = false, features = [] }
 
 [features]
 default = ["use_regex_full"]

base/src/cast.rs

@@ -5,6 +5,7 @@ use crate::{
         token::Error,
         types::CellReferenceIndex,
     },
+    formatter::format::parse_formatted_number,
     model::Model,
 };
 
@@ -14,6 +15,23 @@ pub(crate) enum NumberOrArray {
 }
 
 impl Model {
+    pub(crate) fn cast_number(&self, s: &str) -> Option<f64> {
+        match s.trim().parse::<f64>() {
+            Ok(f) => Some(f),
+            _ => {
+                let currency = &self.locale.currency.symbol;
+                let mut currencies = vec!["$", "€"];
+                if !currencies.iter().any(|e| *e == currency) {
+                    currencies.push(currency);
+                }
+                // Try to parse as a formatted number (e.g., dates, currencies, percentages)
+                if let Ok((v, _number_format)) = parse_formatted_number(s, &currencies) {
+                    return Some(v);
+                }
+                None
+            }
+        }
+    }
     pub(crate) fn get_number_or_array(
         &mut self,
         node: &Node,
@@ -21,9 +39,9 @@ impl Model {
     ) -> Result<NumberOrArray, CalcResult> {
         match self.evaluate_node_in_context(node, cell) {
             CalcResult::Number(f) => Ok(NumberOrArray::Number(f)),
-            CalcResult::String(s) => match s.parse::<f64>() {
+            CalcResult::String(s) => match self.cast_number(&s) {
-                Ok(f) => Ok(NumberOrArray::Number(f)),
+                Some(f) => Ok(NumberOrArray::Number(f)),
-                _ => Err(CalcResult::new_error(
+                None => Err(CalcResult::new_error(
                     Error::VALUE,
                     cell,
                     "Expecting number".to_string(),
@@ -89,16 +107,16 @@ impl Model {
         self.cast_to_number(result, cell)
     }
 
-    fn cast_to_number(
+    pub(crate) fn cast_to_number(
         &mut self,
         result: CalcResult,
         cell: CellReferenceIndex,
     ) -> Result<f64, CalcResult> {
         match result {
             CalcResult::Number(f) => Ok(f),
-            CalcResult::String(s) => match s.parse::<f64>() {
+            CalcResult::String(s) => match self.cast_number(&s) {
-                Ok(f) => Ok(f),
+                Some(f) => Ok(f),
-                _ => Err(CalcResult::new_error(
+                None => Err(CalcResult::new_error(
                     Error::VALUE,
                     cell,
                     "Expecting number".to_string(),

base/src/expressions/parser/static_analysis.rs

@@ -834,6 +834,61 @@ fn get_function_args_signature(kind: &Function, arg_count: usize) -> Vec<Signatu
         Function::Geomean => vec![Signature::Vector; arg_count],
         Function::Networkdays => args_signature_networkdays(arg_count),
         Function::NetworkdaysIntl => args_signature_networkdays_intl(arg_count),
+        Function::Acot => args_signature_scalars(arg_count, 1, 0),
+        Function::Acoth => args_signature_scalars(arg_count, 1, 0),
+        Function::Cot => args_signature_scalars(arg_count, 1, 0),
+        Function::Coth => args_signature_scalars(arg_count, 1, 0),
+        Function::Csc => args_signature_scalars(arg_count, 1, 0),
+        Function::Csch => args_signature_scalars(arg_count, 1, 0),
+        Function::Sec => args_signature_scalars(arg_count, 1, 0),
+        Function::Sech => args_signature_scalars(arg_count, 1, 0),
+        Function::Exp => args_signature_scalars(arg_count, 1, 0),
+        Function::Fact => args_signature_scalars(arg_count, 1, 0),
+        Function::Factdouble => args_signature_scalars(arg_count, 1, 0),
+        Function::Sign => args_signature_scalars(arg_count, 1, 0),
+        Function::Radians => args_signature_scalars(arg_count, 1, 0),
+        Function::Degrees => args_signature_scalars(arg_count, 1, 0),
+        Function::Int => args_signature_scalars(arg_count, 1, 0),
+        Function::Even => args_signature_scalars(arg_count, 1, 0),
+        Function::Odd => args_signature_scalars(arg_count, 1, 0),
+        Function::Ceiling => args_signature_scalars(arg_count, 2, 0),
+        Function::CeilingMath => args_signature_scalars(arg_count, 1, 2),
+        Function::CeilingPrecise => args_signature_scalars(arg_count, 1, 1),
+        Function::Floor => args_signature_scalars(arg_count, 2, 0),
+        Function::FloorMath => args_signature_scalars(arg_count, 1, 2),
+        Function::FloorPrecise => args_signature_scalars(arg_count, 1, 1),
+        Function::IsoCeiling => args_signature_scalars(arg_count, 1, 1),
+        Function::Mod => args_signature_scalars(arg_count, 2, 0),
+        Function::Quotient => args_signature_scalars(arg_count, 2, 0),
+        Function::Mround => args_signature_scalars(arg_count, 2, 0),
+        Function::Trunc => args_signature_scalars(arg_count, 1, 1),
+        Function::Gcd => vec![Signature::Vector; arg_count],
+        Function::Lcm => vec![Signature::Vector; arg_count],
+        Function::Base => args_signature_scalars(arg_count, 2, 1),
+        Function::Decimal => args_signature_scalars(arg_count, 2, 0),
+        Function::Roman => args_signature_scalars(arg_count, 1, 1),
+        Function::Arabic => args_signature_scalars(arg_count, 1, 0),
+        Function::Combin => args_signature_scalars(arg_count, 2, 0),
+        Function::Combina => args_signature_scalars(arg_count, 2, 0),
+        Function::Sumsq => vec![Signature::Vector; arg_count],
+
+        Function::N => args_signature_scalars(arg_count, 1, 0),
+        Function::Sheets => args_signature_scalars(arg_count, 0, 1),
+        Function::Cell => args_signature_scalars(arg_count, 1, 1),
+        Function::Info => args_signature_scalars(arg_count, 1, 1),
+
+        Function::Daverage => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dcount => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dget => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dmax => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dmin => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dsum => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dcounta => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dproduct => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dstdev => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dvar => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dvarp => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
+        Function::Dstdevp => vec![Signature::Vector, Signature::Scalar, Signature::Vector],
     }
 }
 
@@ -1056,5 +1111,59 @@ fn static_analysis_on_function(kind: &Function, args: &[Node]) -> StaticResult {
         Function::Geomean => not_implemented(args),
         Function::Networkdays => not_implemented(args),
         Function::NetworkdaysIntl => not_implemented(args),
+        Function::Acot => scalar_arguments(args),
+        Function::Acoth => scalar_arguments(args),
+        Function::Cot => scalar_arguments(args),
+        Function::Coth => scalar_arguments(args),
+        Function::Csc => scalar_arguments(args),
+        Function::Csch => scalar_arguments(args),
+        Function::Sec => scalar_arguments(args),
+        Function::Sech => scalar_arguments(args),
+        Function::Exp => scalar_arguments(args),
+        Function::Fact => scalar_arguments(args),
+        Function::Factdouble => scalar_arguments(args),
+        Function::Sign => scalar_arguments(args),
+        Function::Radians => scalar_arguments(args),
+        Function::Degrees => scalar_arguments(args),
+        Function::Int => scalar_arguments(args),
+        Function::Even => scalar_arguments(args),
+        Function::Odd => scalar_arguments(args),
+        Function::Ceiling => scalar_arguments(args),
+        Function::CeilingMath => scalar_arguments(args),
+        Function::CeilingPrecise => scalar_arguments(args),
+        Function::Floor => scalar_arguments(args),
+        Function::FloorMath => scalar_arguments(args),
+        Function::FloorPrecise => scalar_arguments(args),
+        Function::IsoCeiling => scalar_arguments(args),
+        Function::Mod => scalar_arguments(args),
+        Function::Quotient => scalar_arguments(args),
+        Function::Mround => scalar_arguments(args),
+        Function::Trunc => scalar_arguments(args),
+        Function::Gcd => not_implemented(args),
+        Function::Lcm => not_implemented(args),
+        Function::Base => scalar_arguments(args),
+        Function::Decimal => scalar_arguments(args),
+        Function::Roman => scalar_arguments(args),
+        Function::Arabic => scalar_arguments(args),
+        Function::Combin => scalar_arguments(args),
+        Function::Combina => scalar_arguments(args),
+        Function::Sumsq => StaticResult::Scalar,
+        Function::N => scalar_arguments(args),
+        Function::Sheets => scalar_arguments(args),
+        Function::Cell => scalar_arguments(args),
+        Function::Info => scalar_arguments(args),
+
+        Function::Dget => not_implemented(args),
+        Function::Dmax => not_implemented(args),
+        Function::Dmin => not_implemented(args),
+        Function::Dcount => not_implemented(args),
+        Function::Daverage => not_implemented(args),
+        Function::Dsum => not_implemented(args),
+        Function::Dcounta => not_implemented(args),
+        Function::Dproduct => not_implemented(args),
+        Function::Dstdev => not_implemented(args),
+        Function::Dvar => not_implemented(args),
+        Function::Dvarp => not_implemented(args),
+        Function::Dstdevp => not_implemented(args),
     }
 }

base/src/expressions/parser/stringify.rs

@@ -520,6 +520,7 @@ fn stringify(
             let x = match **left {
                 BooleanKind(_)
                 | NumberKind(_)
+                | UnaryKind { .. }
                 | StringKind(_)
                 | ReferenceKind { .. }
                 | RangeKind { .. }
@@ -535,7 +536,6 @@ fn stringify(
                 | FunctionKind { .. }
                 | InvalidFunctionKind { .. }
                 | ArrayKind(_)
-                | UnaryKind { .. }
                 | ErrorKind(_)
                 | ParseErrorKind { .. }
                 | OpSumKind { .. }
@@ -630,7 +630,6 @@ fn stringify(
                     | OpRangeKind { .. }
                     | OpConcatenateKind { .. }
                     | OpProductKind { .. }
-                    | OpPowerKind { .. }
                     | FunctionKind { .. }
                     | InvalidFunctionKind { .. }
                     | ArrayKind(_)
@@ -643,7 +642,7 @@ fn stringify(
                     | ParseErrorKind { .. }
                     | EmptyArgKind => false,
 
-                    OpSumKind { .. } | UnaryKind { .. } => true,
+                    OpPowerKind { .. } | OpSumKind { .. } | UnaryKind { .. } => true,
                 };
                 if needs_parentheses {
                     format!(

base/src/expressions/parser/tests/mod.rs

@@ -3,6 +3,7 @@ mod test_arrays;
 mod test_general;
 mod test_implicit_intersection;
 mod test_issue_155;
+mod test_issue_483;
 mod test_move_formula;
 mod test_ranges;
 mod test_stringify;

base/src/expressions/parser/tests/test_issue_483.rs

@@ -0,0 +1,27 @@
+#![allow(clippy::panic)]
+
+use std::collections::HashMap;
+
+use crate::expressions::parser::stringify::to_string;
+use crate::expressions::parser::{Node, Parser};
+use crate::expressions::types::CellReferenceRC;
+
+#[test]
+fn issue_483_parser() {
+    let worksheets = vec!["Sheet1".to_string()];
+    let mut parser = Parser::new(worksheets, vec![], HashMap::new());
+
+    // Reference cell is Sheet1!A1
+    let cell_reference = CellReferenceRC {
+        sheet: "Sheet1".to_string(),
+        row: 2,
+        column: 2,
+    };
+    let t = parser.parse("-(A1^1.22)", &cell_reference);
+    assert!(matches!(t, Node::UnaryKind { .. }));
+    assert_eq!(to_string(&t, &cell_reference), "-(A1^1.22)");
+
+    let t = parser.parse("-A1^1.22", &cell_reference);
+    assert!(matches!(t, Node::OpPowerKind { .. }));
+    assert_eq!(to_string(&t, &cell_reference), "-A1^1.22");
+}

base/src/expressions/utils/mod.rs

@@ -211,15 +211,19 @@ pub fn parse_reference_a1(r: &str) -> Option<ParsedReference> {
 pub fn is_valid_identifier(name: &str) -> bool {
     // https://support.microsoft.com/en-us/office/names-in-formulas-fc2935f9-115d-4bef-a370-3aa8bb4c91f1
     // https://github.com/MartinTrummer/excel-names/
-    // NOTE: We are being much more restrictive than Excel.
-    // In particular we do not support non ascii characters.
     let upper = name.to_ascii_uppercase();
-    let bytes = upper.as_bytes();
+    // length of chars
-    let len = bytes.len();
+    let len = upper.chars().count();
+
+    let mut chars = upper.chars();
+
     if len > 255 || len == 0 {
         return false;
     }
-    let first = bytes[0] as char;
+    let first = match chars.next() {
+        Some(ch) => ch,
+        None => return false,
+    };
     // The first character of a name must be a letter, an underscore character (_), or a backslash (\).
     if !(first.is_ascii_alphabetic() || first == '_' || first == '\\') {
         return false;
@@ -237,21 +241,11 @@ pub fn is_valid_identifier(name: &str) -> bool {
     if parse_reference_r1c1(name).is_some() {
         return false;
     }
-    let mut i = 1;
+    for ch in chars {
-    while i < len {
+        if !(ch.is_alphanumeric() || ch == '_' || ch == '.') {
-        let ch = bytes[i] as char;
-        match ch {
-            'a'..='z' => {}
-            'A'..='Z' => {}
-            '0'..='9' => {}
-            '_' => {}
-            '.' => {}
-            _ => {
             return false;
         }
     }
-        i += 1;
-    }
 
     true
 }
@@ -259,15 +253,23 @@ pub fn is_valid_identifier(name: &str) -> bool {
 fn name_needs_quoting(name: &str) -> bool {
     let chars = name.chars();
     // it contains any of these characters: ()'$,;-+{} or space
-    for char in chars {
+    for (i, char) in chars.enumerate() {
         if [' ', '(', ')', '\'', '$', ',', ';', '-', '+', '{', '}'].contains(&char) {
             return true;
         }
+        // if it starts with a number
+        if i == 0 && char.is_ascii_digit() {
+            return true;
         }
-    // TODO:
+    }
+    if parse_reference_a1(name).is_some() {
         // cell reference in A1 notation, e.g. B1048576 is quoted, B1048577 is not
+        return true;
+    }
+    if parse_reference_r1c1(name).is_some() {
         // cell reference in R1C1 notation, e.g. RC, RC2, R5C, R-4C, RC-8, R, C
-    // integers
+        return true;
+    }
     false
 }
 
@@ -279,3 +281,32 @@ pub fn quote_name(name: &str) -> String {
     };
     name.to_string()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_quote_name() {
+        assert_eq!(quote_name("Sheet1"), "Sheet1");
+        assert_eq!(quote_name("Sheet 1"), "'Sheet 1'");
+        // escape and quote
+        assert_eq!(quote_name("Sheet1'"), "'Sheet1'''");
+        assert_eq!(quote_name("Data(2024)"), "'Data(2024)'");
+        assert_eq!(quote_name("Data$2024"), "'Data$2024'");
+        assert_eq!(quote_name("Data-2024"), "'Data-2024'");
+        assert_eq!(quote_name("Data+2024"), "'Data+2024'");
+        assert_eq!(quote_name("Data,2024"), "'Data,2024'");
+        assert_eq!(quote_name("Data;2024"), "'Data;2024'");
+        assert_eq!(quote_name("Data{2024}"), "'Data{2024}'");
+
+        assert_eq!(quote_name("2024"), "'2024'");
+        assert_eq!(quote_name("1Data"), "'1Data'");
+        assert_eq!(quote_name("A1"), "'A1'");
+        assert_eq!(quote_name("R1C1"), "'R1C1'");
+        assert_eq!(quote_name("MySheet"), "MySheet");
+
+        assert_eq!(quote_name("B1048576"), "'B1048576'");
+        assert_eq!(quote_name("B1048577"), "B1048577");
+    }
+}

base/src/expressions/utils/test.rs

@@ -196,6 +196,7 @@ fn test_names() {
     assert!(is_valid_identifier("_."));
     assert!(is_valid_identifier("_1"));
     assert!(is_valid_identifier("\\."));
+    assert!(is_valid_identifier("truñe"));
 
     // invalid
     assert!(!is_valid_identifier("true"));
@@ -209,7 +210,6 @@ fn test_names() {
     assert!(!is_valid_identifier("1true"));
 
     assert!(!is_valid_identifier("test€"));
-    assert!(!is_valid_identifier("truñe"));
     assert!(!is_valid_identifier("tr&ue"));
 
     assert!(!is_valid_identifier("LOG10"));

base/src/formatter/format.rs

@@ -15,7 +15,7 @@ pub struct Formatted {
 
 /// Returns the vector of chars of the fractional part of a *positive* number:
 /// 3.1415926 ==> ['1', '4', '1', '5', '9', '2', '6']
-fn get_fract_part(value: f64, precision: i32) -> Vec<char> {
+fn get_fract_part(value: f64, precision: i32, int_len: usize) -> Vec<char> {
     let b = format!("{:.1$}", value.fract(), precision as usize)
         .chars()
         .collect::<Vec<char>>();
@@ -30,6 +30,12 @@ fn get_fract_part(value: f64, precision: i32) -> Vec<char> {
     if last_non_zero < 2 {
         return vec![];
     }
+    let max_len = if int_len > 15 {
+        2_usize
+    } else {
+        15_usize - int_len + 1
+    };
+    let last_non_zero = usize::min(last_non_zero, max_len + 1);
     b[2..last_non_zero].to_vec()
 }
 
@@ -154,16 +160,11 @@ pub fn format_number(value_original: f64, format: &str, locale: &Locale) -> Form
         ParsePart::Date(p) => {
             let tokens = &p.tokens;
             let mut text = "".to_string();
-            let date = match from_excel_date(value as i64) {
+            let time_fract = value.fract();
-                Ok(d) => d,
+            let hours = (time_fract * 24.0).floor();
-                Err(e) => {
+            let minutes = ((time_fract * 24.0 - hours) * 60.0).floor();
-                    return Formatted {
+            let seconds = ((((time_fract * 24.0 - hours) * 60.0) - minutes) * 60.0).round();
-                        text: "#VALUE!".to_owned(),
+            let date = from_excel_date(value as i64).ok();
-                        color: None,
-                        error: Some(e),
-                    }
-                }
-            };
             for token in tokens {
                 match token {
                     TextToken::Literal(c) => {
@@ -187,15 +188,44 @@ pub fn format_number(value_original: f64, format: &str, locale: &Locale) -> Form
                     }
                     TextToken::Digit(_) => {}
                     TextToken::Period => {}
-                    TextToken::Day => {
+                    TextToken::Day => match date {
+                        Some(date) => {
                             let day = date.day() as usize;
                             text = format!("{text}{day}");
                         }
+                        None => {
+                            return Formatted {
+                                text: "#VALUE!".to_owned(),
+                                color: None,
+                                error: Some(format!("Invalid date value: '{value}'")),
+                            }
+                        }
+                    },
                     TextToken::DayPadded => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let day = date.day() as usize;
                         text = format!("{text}{day:02}");
                     }
                     TextToken::DayNameShort => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let mut day = date.weekday().number_from_monday() as usize;
                         if day == 7 {
                             day = 0;
@@ -203,6 +233,16 @@ pub fn format_number(value_original: f64, format: &str, locale: &Locale) -> Form
                         text = format!("{}{}", text, &locale.dates.day_names_short[day]);
                     }
                     TextToken::DayName => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let mut day = date.weekday().number_from_monday() as usize;
                         if day == 7 {
                             day = 0;
@@ -210,32 +250,144 @@ pub fn format_number(value_original: f64, format: &str, locale: &Locale) -> Form
                         text = format!("{}{}", text, &locale.dates.day_names[day]);
                     }
                     TextToken::Month => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let month = date.month() as usize;
                         text = format!("{text}{month}");
                     }
                     TextToken::MonthPadded => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let month = date.month() as usize;
                         text = format!("{text}{month:02}");
                     }
                     TextToken::MonthNameShort => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let month = date.month() as usize;
                         text = format!("{}{}", text, &locale.dates.months_short[month - 1]);
                     }
                     TextToken::MonthName => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let month = date.month() as usize;
                         text = format!("{}{}", text, &locale.dates.months[month - 1]);
                     }
                     TextToken::MonthLetter => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         let month = date.month() as usize;
                         let months_letter = &locale.dates.months_letter[month - 1];
                         text = format!("{text}{months_letter}");
                     }
                     TextToken::YearShort => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         text = format!("{}{}", text, date.format("%y"));
                     }
                     TextToken::Year => {
+                        let date = match date {
+                            Some(d) => d,
+                            None => {
+                                return Formatted {
+                                    text: "#VALUE!".to_owned(),
+                                    color: None,
+                                    error: Some(format!("Invalid date value: '{value}'")),
+                                }
+                            }
+                        };
                         text = format!("{}{}", text, date.year());
                     }
+                    TextToken::Hour => {
+                        let mut hour = hours as i32;
+                        if p.use_ampm {
+                            if hour == 0 {
+                                hour = 12;
+                            } else if hour > 12 {
+                                hour -= 12;
+                            }
+                        }
+                        text = format!("{text}{hour}");
+                    }
+                    TextToken::HourPadded => {
+                        let mut hour = hours as i32;
+                        if p.use_ampm {
+                            if hour == 0 {
+                                hour = 12;
+                            } else if hour > 12 {
+                                hour -= 12;
+                            }
+                        }
+                        text = format!("{text}{hour:02}");
+                    }
+                    TextToken::Second => {
+                        let second = seconds as i32;
+                        text = format!("{text}{second}");
+                    }
+                    TextToken::SecondPadded => {
+                        let second = seconds as i32;
+                        text = format!("{text}{second:02}");
+                    }
+                    TextToken::AMPM => {
+                        let ampm = if hours < 12.0 { "AM" } else { "PM" };
+                        text = format!("{text}{ampm}");
+                    }
+                    TextToken::Minute => {
+                        let minute = minutes as i32;
+                        text = format!("{text}{minute}");
+                    }
+                    TextToken::MinutePadded => {
+                        let minute = minutes as i32;
+                        text = format!("{text}{minute:02}");
+                    }
                 }
             }
             Formatted {
@@ -277,7 +429,7 @@ pub fn format_number(value_original: f64, format: &str, locale: &Locale) -> Form
             if value_abs as i64 == 0 {
                 int_part = vec![];
             }
-            let fract_part = get_fract_part(value_abs, p.precision);
+            let fract_part = get_fract_part(value_abs, p.precision, int_part.len());
             // ln is the number of digits of the integer part of the value
             let ln = int_part.len() as i32;
             // digit count is the number of digit tokens ('0', '?' and '#') to the left of the decimal point
@@ -422,6 +574,13 @@ pub fn format_number(value_original: f64, format: &str, locale: &Locale) -> Form
                     TextToken::MonthLetter => {}
                     TextToken::YearShort => {}
                     TextToken::Year => {}
+                    TextToken::Hour => {}
+                    TextToken::HourPadded => {}
+                    TextToken::Minute => {}
+                    TextToken::MinutePadded => {}
+                    TextToken::Second => {}
+                    TextToken::SecondPadded => {}
+                    TextToken::AMPM => {}
                 }
             }
             Formatted {
@@ -591,10 +750,10 @@ fn parse_date(value: &str) -> Result<(i32, String), String> {
 /// "30.34%" => (0.3034, "0.00%")
 /// 100€ => (100, "100€")
 pub(crate) fn parse_formatted_number(
-    value: &str,
+    original: &str,
     currencies: &[&str],
 ) -> Result<(f64, Option<String>), String> {
-    let value = value.trim();
+    let value = original.trim();
     let scientific_format = "0.00E+00";
 
     // Check if it is a percentage
@@ -646,7 +805,8 @@ pub(crate) fn parse_formatted_number(
         }
     }
 
-    if let Ok((serial_number, format)) = parse_date(value) {
+    // check if it is a date. NOTE: we don't trim the original here
+    if let Ok((serial_number, format)) = parse_date(original) {
         return Ok((serial_number as f64, Some(format)));
     }
 

base/src/formatter/lexer.rs

@@ -26,19 +26,23 @@ pub enum Token {
     Scientific,    // E+
     ScientificMinus, // E-
     General,       // General
-    // Dates
+    // Dates and time
     Day,            // d
     DayPadded,      // dd
     DayNameShort,   // ddd
     DayName,        // dddd+
-    Month,          // m
+    Month,          // m (or minute)
-    MonthPadded,    // mm
+    MonthPadded,    // mm (or minute padded)
     MonthNameShort, // mmm
     MonthName,      // mmmm or mmmmmm+
     MonthLetter,    // mmmmm
     YearShort,      // y or yy
     Year,           // yyy+
-    // TODO: Hours Minutes and Seconds
+    Hour,           // h
+    HourPadded,     // hh
+    Second,         // s
+    SecondPadded,   // ss
+    AMPM,           // AM/PM (or A/P)
     ILLEGAL,
     EOF,
 }
@@ -361,8 +365,8 @@ impl Lexer {
                         self.read_next_char();
                     }
                     match m {
-                        1 => Token::Month,
+                        1 => Token::Month,       // (or minute)
-                        2 => Token::MonthPadded,
+                        2 => Token::MonthPadded, // (or minute padded)
                         3 => Token::MonthNameShort,
                         4 => Token::MonthName,
                         5 => Token::MonthLetter,
@@ -381,6 +385,63 @@ impl Lexer {
                         Token::Year
                     }
                 }
+                'h' => {
+                    let mut h = 1;
+                    while let Some('h') = self.peek_char() {
+                        h += 1;
+                        self.read_next_char();
+                    }
+                    if h == 1 {
+                        Token::Hour
+                    } else if h == 2 {
+                        Token::HourPadded
+                    } else {
+                        self.set_error("Unexpected character after 'h'");
+                        Token::ILLEGAL
+                    }
+                }
+                's' => {
+                    let mut s = 1;
+                    while let Some('s') = self.peek_char() {
+                        s += 1;
+                        self.read_next_char();
+                    }
+                    if s == 1 {
+                        Token::Second
+                    } else if s == 2 {
+                        Token::SecondPadded
+                    } else {
+                        self.set_error("Unexpected character after 's'");
+                        Token::ILLEGAL
+                    }
+                }
+                'A' | 'a' => {
+                    if let Some('M') | Some('m') = self.peek_char() {
+                        self.read_next_char();
+                    } else {
+                        self.set_error("Unexpected character after 'A'");
+                        return Token::ILLEGAL;
+                    }
+                    if let Some('/') = self.peek_char() {
+                        self.read_next_char();
+                    } else {
+                        self.set_error("Unexpected character after 'AM'");
+                        return Token::ILLEGAL;
+                    }
+                    if let Some('P') | Some('p') = self.peek_char() {
+                        self.read_next_char();
+                    } else {
+                        self.set_error("Unexpected character after 'AM'");
+                        return Token::ILLEGAL;
+                    }
+                    if let Some('M') | Some('m') = self.peek_char() {
+                        self.read_next_char();
+                    } else {
+                        self.set_error("Unexpected character after 'AMP'");
+                        return Token::ILLEGAL;
+                    }
+                    Token::AMPM
+                }
                 'g' | 'G' => {
                     for c in "eneral".chars() {
                         let cc = self.read_next_char();

base/src/formatter/parser.rs

@@ -27,6 +27,13 @@ pub enum TextToken {
     MonthLetter,
     YearShort,
     Year,
+    Hour,
+    HourPadded,
+    Minute,
+    MinutePadded,
+    Second,
+    SecondPadded,
+    AMPM,
 }
 pub struct NumberPart {
     pub color: Option<i32>,
@@ -45,6 +52,7 @@ pub struct NumberPart {
 
 pub struct DatePart {
     pub color: Option<i32>,
+    pub use_ampm: bool,
     pub tokens: Vec<TextToken>,
 }
 
@@ -101,6 +109,7 @@ impl Parser {
         let mut digit_count = 0;
         let mut precision = 0;
         let mut is_date = false;
+        let mut use_ampm = false;
         let mut is_number = false;
         let mut found_decimal_dot = false;
         let mut use_thousands = false;
@@ -116,6 +125,7 @@ impl Parser {
         let mut number = 'i';
         let mut index = 0;
         let mut currency = None;
+        let mut is_time = false;
 
         while token != Token::EOF && token != Token::Separator {
             let next_token = self.lexer.next_token();
@@ -200,6 +210,9 @@ impl Parser {
                     index += 1;
                 }
                 Token::Literal(value) => {
+                    if value == ':' {
+                        is_time = true;
+                    }
                     tokens.push(TextToken::Literal(value));
                 }
                 Token::Text(value) => {
@@ -236,13 +249,23 @@ impl Parser {
                     tokens.push(TextToken::MonthName);
                 }
                 Token::Month => {
+                    if is_time {
+                        // minute
+                        tokens.push(TextToken::Minute);
+                    } else {
                         is_date = true;
                         tokens.push(TextToken::Month);
                     }
+                }
                 Token::MonthPadded => {
+                    if is_time {
+                        // minute padded
+                        tokens.push(TextToken::MinutePadded);
+                    } else {
                         is_date = true;
                         tokens.push(TextToken::MonthPadded);
                     }
+                }
                 Token::MonthLetter => {
                     is_date = true;
                     tokens.push(TextToken::MonthLetter);
@@ -255,6 +278,32 @@ impl Parser {
                     is_date = true;
                     tokens.push(TextToken::Year);
                 }
+                Token::Hour => {
+                    is_date = true;
+                    is_time = true;
+                    tokens.push(TextToken::Hour);
+                }
+                Token::HourPadded => {
+                    is_date = true;
+                    is_time = true;
+                    tokens.push(TextToken::HourPadded);
+                }
+                Token::Second => {
+                    is_date = true;
+                    is_time = true;
+                    tokens.push(TextToken::Second);
+                }
+                Token::SecondPadded => {
+                    is_date = true;
+                    is_time = true;
+                    tokens.push(TextToken::SecondPadded);
+                }
+
+                Token::AMPM => {
+                    is_date = true;
+                    use_ampm = true;
+                    tokens.push(TextToken::AMPM);
+                }
                 Token::Scientific => {
                     if !is_scientific {
                         index = 0;
@@ -282,7 +331,11 @@ impl Parser {
             if is_number {
                 return ParsePart::Error(ErrorPart {});
             }
-            ParsePart::Date(DatePart { color, tokens })
+            ParsePart::Date(DatePart {
+                color,
+                use_ampm,
+                tokens,
+            })
         } else {
             ParsePart::Number(NumberPart {
                 color,

base/src/formatter/test/mod.rs

@@ -1,2 +1,3 @@
 mod test_general;
 mod test_parse_formatted_number;
+mod test_time;

base/src/formatter/test/test_time.rs

@@ -0,0 +1,32 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{
+    formatter::format::format_number,
+    locale::{get_locale, Locale},
+};
+
+fn get_default_locale() -> &'static Locale {
+    get_locale("en").unwrap()
+}
+
+#[test]
+fn simple_test() {
+    let locale = get_default_locale();
+    let format = "h:mm AM/PM";
+    let value = 16.001_423_611_111_11; // =1/86400 => 12:02 AM
+    let formatted = format_number(value, format, locale);
+    assert_eq!(formatted.text, "12:02 AM");
+}
+
+#[test]
+fn padded_vs_unpadded() {
+    let locale = get_default_locale();
+    let padded_format = "hh:mm:ss AM/PM";
+    let unpadded_format = "h:m:s AM/PM";
+    let value = 0.25351851851851853; // => 6:05:04 AM (21904/(24*60*60)) where 21904 = 6 * 3600 + 5*60 + 4
+    let formatted = format_number(value, padded_format, locale);
+    assert_eq!(formatted.text, "06:05:04 AM");
+
+    let formatted = format_number(value, unpadded_format, locale);
+    assert_eq!(formatted.text, "6:5:4 AM");
+}

base/src/functions/database.rs

@@ -0,0 +1,946 @@
+use chrono::Datelike;
+
+use crate::{
+    calc_result::CalcResult,
+    expressions::{parser::Node, token::Error, types::CellReferenceIndex},
+    formatter::dates::date_to_serial_number,
+    Model,
+};
+
+use super::util::{compare_values, from_wildcard_to_regex, result_matches_regex};
+
+impl Model {
+    // =DAVERAGE(database, field, criteria)
+    pub(crate) fn fn_daverage(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut sum = 0.0f64;
+        let mut count = 0usize;
+
+        let mut row = db_left.row + 1; // skip header
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if let CalcResult::Number(n) = v {
+                    if n.is_finite() {
+                        sum += n;
+                        count += 1;
+                    }
+                }
+            }
+            row += 1;
+        }
+
+        if count == 0 {
+            return CalcResult::Error {
+                error: Error::DIV,
+                origin: cell,
+                message: "No numeric values matched criteria".to_string(),
+            };
+        }
+
+        CalcResult::Number(sum / count as f64)
+    }
+
+    // =DCOUNT(database, field, criteria)
+    // Counts numeric entries in the field for rows that match criteria
+    pub(crate) fn fn_dcount(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut count = 0usize;
+        let mut row = db_left.row + 1; // skip header
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if matches!(v, CalcResult::Number(_)) {
+                    count += 1;
+                }
+            }
+            row += 1;
+        }
+
+        CalcResult::Number(count as f64)
+    }
+
+    // =DGET(database, field, criteria)
+    // Returns the (single) field value for the unique matching row
+    pub(crate) fn fn_dget(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut result: Option<CalcResult> = None;
+        let mut matches = 0usize;
+
+        let mut row = db_left.row + 1;
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                matches += 1;
+                if matches > 1 {
+                    return CalcResult::Error {
+                        error: Error::NUM,
+                        origin: cell,
+                        message: "More than one matching record".to_string(),
+                    };
+                }
+                result = Some(self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                }));
+            }
+            row += 1;
+        }
+
+        match (matches, result) {
+            (0, _) | (_, None) => CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No matching record".to_string(),
+            },
+            (_, Some(v)) => v,
+        }
+    }
+
+    // =DMAX(database, field, criteria)
+    pub(crate) fn fn_dmax(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        self.db_extreme(args, cell, true)
+    }
+
+    // =DMIN(database, field, criteria)
+    pub(crate) fn fn_dmin(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        self.db_extreme(args, cell, false)
+    }
+
+    // =DSUM(database, field, criteria)
+    pub(crate) fn fn_dsum(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut sum = 0.0;
+
+        // skip header
+        let mut row = db_left.row + 1;
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if let CalcResult::Number(n) = v {
+                    if n.is_finite() {
+                        sum += n;
+                    }
+                }
+            }
+            row += 1;
+        }
+
+        CalcResult::Number(sum)
+    }
+
+    // =DCOUNTA(database, field, criteria)
+    // Counts non-empty entries (any type) in the field for rows that match criteria
+    pub(crate) fn fn_dcounta(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut count = 0;
+        for row in (db_left.row + 1)..=db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if !matches!(v, CalcResult::EmptyCell | CalcResult::EmptyArg) {
+                    count += 1;
+                }
+            }
+        }
+
+        CalcResult::Number(count as f64)
+    }
+
+    // =DPRODUCT(database, field, criteria)
+    pub(crate) fn fn_dproduct(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut product = 1.0f64;
+        let mut has_numeric = false;
+
+        let mut row = db_left.row + 1; // skip header
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if let CalcResult::Number(n) = v {
+                    if n.is_finite() {
+                        product *= n;
+                        has_numeric = true;
+                    }
+                }
+            }
+            row += 1;
+        }
+
+        // Excel returns 0 when no rows / no numeric values match for DPRODUCT
+        if has_numeric {
+            CalcResult::Number(product)
+        } else {
+            CalcResult::Number(0.0)
+        }
+    }
+
+    // Small internal helper for DSTDEV / DVAR
+    // Collects sum, sum of squares, and count of numeric values in the field
+    // for rows that match the criteria.
+    fn db_numeric_stats(
+        &mut self,
+        args: &[Node],
+        cell: CellReferenceIndex,
+    ) -> Result<(f64, f64, usize), CalcResult> {
+        if args.len() != 3 {
+            return Err(CalcResult::new_args_number_error(cell));
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return Err(e),
+        };
+
+        let field_col = self.resolve_db_field_column(db_left, db_right, &args[1], cell)?;
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return Err(e),
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return Err(CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            });
+        }
+
+        let mut sum = 0.0f64;
+        let mut sumsq = 0.0f64;
+        let mut count = 0usize;
+
+        let mut row = db_left.row + 1; // skip header
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if let CalcResult::Number(n) = v {
+                    if n.is_finite() {
+                        sum += n;
+                        sumsq += n * n;
+                        count += 1;
+                    }
+                }
+            }
+            row += 1;
+        }
+
+        Ok((sum, sumsq, count))
+    }
+
+    // =DSTDEV(database, field, criteria)
+    // Sample standard deviation of matching numeric values
+    pub(crate) fn fn_dstdev(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let (sum, sumsq, count) = match self.db_numeric_stats(args, cell) {
+            Ok(stats) => stats,
+            Err(e) => return e,
+        };
+
+        // Excel behaviour: #DIV/0! if 0 or 1 numeric values match
+        if count < 2 {
+            return CalcResult::Error {
+                error: Error::DIV,
+                origin: cell,
+                message: "Not enough numeric values matched criteria".to_string(),
+            };
+        }
+
+        let n = count as f64;
+        let var = (sumsq - (sum * sum) / n) / (n - 1.0);
+        let var = if var < 0.0 { 0.0 } else { var };
+        CalcResult::Number(var.sqrt())
+    }
+
+    // =DVAR(database, field, criteria)
+    // Sample variance of matching numeric values
+    pub(crate) fn fn_dvar(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let (sum, sumsq, count) = match self.db_numeric_stats(args, cell) {
+            Ok(stats) => stats,
+            Err(e) => return e,
+        };
+
+        // Excel behaviour: #DIV/0! if 0 or 1 numeric values match
+        if count < 2 {
+            return CalcResult::Error {
+                error: Error::DIV,
+                origin: cell,
+                message: "Not enough numeric values matched criteria".to_string(),
+            };
+        }
+
+        let n = count as f64;
+        let var = (sumsq - (sum * sum) / n) / (n - 1.0);
+        let var = if var < 0.0 { 0.0 } else { var };
+        CalcResult::Number(var)
+    }
+
+    // =DSTDEVP(database, field, criteria)
+    // Population standard deviation of matching numeric values
+    pub(crate) fn fn_dstdevp(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let (sum, sumsq, count) = match self.db_numeric_stats(args, cell) {
+            Ok(stats) => stats,
+            Err(e) => return e,
+        };
+
+        // Excel behaviour: #DIV/0! if no numeric values match
+        if count == 0 {
+            return CalcResult::Error {
+                error: Error::DIV,
+                origin: cell,
+                message: "No numeric values matched criteria".to_string(),
+            };
+        }
+
+        let n = count as f64;
+        let var = (sumsq - (sum * sum) / n) / n;
+        let var = if var < 0.0 { 0.0 } else { var };
+        CalcResult::Number(var.sqrt())
+    }
+
+    // =DVARP(database, field, criteria)
+    // Population variance of matching numeric values
+    pub(crate) fn fn_dvarp(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let (sum, sumsq, count) = match self.db_numeric_stats(args, cell) {
+            Ok(stats) => stats,
+            Err(e) => return e,
+        };
+
+        // Excel behaviour: #DIV/0! if no numeric values match
+        if count == 0 {
+            return CalcResult::Error {
+                error: Error::DIV,
+                origin: cell,
+                message: "No numeric values matched criteria".to_string(),
+            };
+        }
+
+        let n = count as f64;
+        let var = (sumsq - (sum * sum) / n) / n;
+        let var = if var < 0.0 { 0.0 } else { var };
+        CalcResult::Number(var)
+    }
+
+    /// Resolve the "field" (2nd arg) to an absolute column index (i32) within the sheet.
+    /// Field can be a number (1-based index) or a header name (case-insensitive).
+    /// Returns the absolute column index, not a 1-based offset within the database range.
+    fn resolve_db_field_column(
+        &mut self,
+        db_left: CellReferenceIndex,
+        db_right: CellReferenceIndex,
+        field_arg: &Node,
+        cell: CellReferenceIndex,
+    ) -> Result<i32, CalcResult> {
+        let field_column_name = match self.evaluate_node_in_context(field_arg, cell) {
+            CalcResult::String(s) => s.to_lowercase(),
+            CalcResult::Number(index) => {
+                let index = index.floor() as i32;
+                if index < 1 || db_left.column + index - 1 > db_right.column {
+                    return Err(CalcResult::Error {
+                        error: Error::VALUE,
+                        origin: cell,
+                        message: "Field index out of range".to_string(),
+                    });
+                }
+                return Ok(db_left.column + index - 1);
+            }
+            CalcResult::Boolean(b) => {
+                return if b {
+                    Ok(db_left.column)
+                } else {
+                    // Index 0 is out of range
+                    Err(CalcResult::Error {
+                        error: Error::VALUE,
+                        origin: cell,
+                        message: "Invalid field specifier".to_string(),
+                    })
+                };
+            }
+            error @ CalcResult::Error { .. } => {
+                return Err(error);
+            }
+            CalcResult::Range { .. } => {
+                return Err(CalcResult::Error {
+                    error: Error::NIMPL,
+                    origin: cell,
+                    message: "Arrays not supported yet".to_string(),
+                })
+            }
+            CalcResult::EmptyCell | CalcResult::EmptyArg => "".to_string(),
+            CalcResult::Array(_) => {
+                return Err(CalcResult::Error {
+                    error: Error::NIMPL,
+                    origin: cell,
+                    message: "Arrays not supported yet".to_string(),
+                })
+            }
+        };
+
+        // We search in the database a column whose header matches field_column_name
+        for column in db_left.column..=db_right.column {
+            let v = self.evaluate_cell(CellReferenceIndex {
+                sheet: db_left.sheet,
+                row: db_left.row,
+                column,
+            });
+            match &v {
+                CalcResult::String(s) => {
+                    if s.to_lowercase() == field_column_name {
+                        return Ok(column);
+                    }
+                }
+                CalcResult::Number(n) => {
+                    if field_column_name == n.to_string() {
+                        return Ok(column);
+                    }
+                }
+                CalcResult::Boolean(b) => {
+                    if field_column_name == b.to_string() {
+                        return Ok(column);
+                    }
+                }
+                CalcResult::Error { .. }
+                | CalcResult::Range { .. }
+                | CalcResult::EmptyCell
+                | CalcResult::EmptyArg
+                | CalcResult::Array(_) => {}
+            }
+        }
+
+        Err(CalcResult::Error {
+            error: Error::VALUE,
+            origin: cell,
+            message: "Field header not found".to_string(),
+        })
+    }
+
+    /// Check whether a database row matches the criteria range.
+    /// Criteria logic: OR across criteria rows; AND across columns within a row.
+    fn db_row_matches_criteria(
+        &mut self,
+        db_left: CellReferenceIndex,
+        db_right: CellReferenceIndex,
+        row: i32,
+        criteria: (CellReferenceIndex, CellReferenceIndex),
+    ) -> bool {
+        let (c_left, c_right) = criteria;
+
+        // Read criteria headers (first row of criteria range)
+        // Map header name (lowercased) -> db column (if exists)
+        let mut crit_cols: Vec<i32> = Vec::new();
+        let mut header_count = 0;
+        // We cover the criteria table:
+        //  headerA | headerB | ...
+        //  critA1  | critA2  | ...
+        //  critB1  | critB2  | ...
+        //  ...
+        for column in c_left.column..=c_right.column {
+            let cell = CellReferenceIndex {
+                sheet: c_left.sheet,
+                row: c_left.row,
+                column,
+            };
+            let criteria_header = self.evaluate_cell(cell);
+            if let Ok(s) = self.cast_to_string(criteria_header, cell) {
+                // Non-empty string header. If the header is non string we skip it
+                header_count += 1;
+                let wanted = s.to_lowercase();
+
+                // Find corresponding Database column
+                let mut found = false;
+                for db_column in db_left.column..=db_right.column {
+                    let db_header = self.evaluate_cell(CellReferenceIndex {
+                        sheet: db_left.sheet,
+                        row: db_left.row,
+                        column: db_column,
+                    });
+                    if let Ok(hs) = self.cast_to_string(db_header, cell) {
+                        if hs.to_lowercase() == wanted {
+                            crit_cols.push(db_column);
+                            found = true;
+                            break;
+                        }
+                    }
+                }
+                if !found {
+                    // that means the criteria column has no matching DB column
+                    // If the criteria condition is empty then we remove this condition
+                    // otherwise this condition can never be satisfied
+                    // We evaluate all criteria rows to see if any is non-empty
+                    let mut has_non_empty = false;
+                    for r in (c_left.row + 1)..=c_right.row {
+                        let ccell = self.evaluate_cell(CellReferenceIndex {
+                            sheet: c_left.sheet,
+                            row: r,
+                            column,
+                        });
+                        if !matches!(ccell, CalcResult::EmptyCell | CalcResult::EmptyArg) {
+                            has_non_empty = true;
+                            break;
+                        }
+                    }
+                    if has_non_empty {
+                        // This criteria column can never be satisfied
+                        header_count -= 1;
+                    }
+                }
+            };
+        }
+
+        if c_right.row <= c_left.row {
+            // If no criteria rows (only headers), everything matches
+            return true;
+        }
+
+        if header_count == 0 {
+            // If there are not "String" headers, nothing matches
+            // NB: There might be String headers that do not match any DB columns,
+            // in that case everything matches.
+            return false;
+        }
+
+        // Evaluate each criteria row (OR)
+        for r in (c_left.row + 1)..=c_right.row {
+            // AND across columns for this criteria row
+            let mut and_ok = true;
+
+            for (offset, db_col) in crit_cols.iter().enumerate() {
+                // Criteria cell
+                let ccell = self.evaluate_cell(CellReferenceIndex {
+                    sheet: c_left.sheet,
+                    row: r,
+                    column: c_left.column + offset as i32,
+                });
+
+                // Empty criteria cell -> ignored
+                if matches!(ccell, CalcResult::EmptyCell | CalcResult::EmptyArg) {
+                    continue;
+                }
+
+                // Database value for this row/column
+                let db_val = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: *db_col,
+                });
+
+                if !self.criteria_cell_matches(&db_val, &ccell) {
+                    and_ok = false;
+                    break;
+                }
+            }
+
+            if and_ok {
+                // This criteria row satisfied (OR)
+                return true;
+            }
+        }
+
+        // none matched
+        false
+    }
+
+    /// Implements Excel-like criteria matching for a single value.
+    /// Supports prefixes: <>, >=, <=, >, <, = ; wildcards * and ? for string equals.
+    fn criteria_cell_matches(&self, db_val: &CalcResult, crit_cell: &CalcResult) -> bool {
+        // Convert the criteria cell to a string for operator parsing if possible,
+        // otherwise fall back to equality via compare_values.
+
+        let mut criteria = match crit_cell {
+            CalcResult::String(s) => s.trim().to_string(),
+            CalcResult::Number(n) => {
+                // treat as equality with number
+                return match db_val {
+                    CalcResult::Number(v) => (*v - *n).abs() <= f64::EPSILON,
+                    _ => false,
+                };
+            }
+            CalcResult::Boolean(b) => {
+                // check equality with boolean
+                return match db_val {
+                    CalcResult::Boolean(v) => *v == *b,
+                    _ => false,
+                };
+            }
+            CalcResult::EmptyCell | CalcResult::EmptyArg => "".to_string(),
+            CalcResult::Error { .. } => return false,
+            CalcResult::Range { .. } | CalcResult::Array(_) => return false,
+        };
+
+        // Detect operator prefix
+        let mut op = "="; // default equality (with wildcard semantics for strings)
+        let prefixes = ["<>", ">=", "<=", ">", "<", "="];
+        for p in prefixes.iter() {
+            if criteria.starts_with(p) {
+                op = p;
+                criteria = criteria[p.len()..].trim().to_string();
+                break;
+            }
+        }
+
+        // Is it a number?
+        let rhs_num = criteria.parse::<f64>().ok();
+
+        // Is it a date?
+        // FIXME: We should parse dates according to locale settings
+        let rhs_date = criteria.parse::<chrono::NaiveDate>().ok();
+
+        match op {
+            ">" | ">=" | "<" | "<=" => {
+                if let Some(d) = rhs_date {
+                    // date comparison
+                    let serial = match date_to_serial_number(d.day(), d.month(), d.year()) {
+                        Ok(sn) => sn as f64,
+                        Err(_) => return false,
+                    };
+
+                    if let CalcResult::Number(n) = db_val {
+                        match op {
+                            ">" => *n > serial,
+                            ">=" => *n >= serial,
+                            "<" => *n < serial,
+                            "<=" => *n <= serial,
+                            _ => false,
+                        }
+                    } else {
+                        false
+                    }
+                } else if let Some(t) = rhs_num {
+                    // numeric comparison
+                    if let CalcResult::Number(n) = db_val {
+                        match op {
+                            ">" => *n > t,
+                            ">=" => *n >= t,
+                            "<" => *n < t,
+                            "<=" => *n <= t,
+                            _ => false,
+                        }
+                    } else {
+                        false
+                    }
+                } else {
+                    // string comparison (case-insensitive) using compare_values semantics
+                    let rhs = CalcResult::String(criteria.to_lowercase());
+                    let lhs = match db_val {
+                        CalcResult::String(s) => CalcResult::String(s.to_lowercase()),
+                        x => x.clone(),
+                    };
+                    let c = compare_values(&lhs, &rhs);
+                    match op {
+                        ">" => c > 0,
+                        ">=" => c >= 0,
+                        "<" => c < 0,
+                        "<=" => c <= 0,
+                        _ => false,
+                    }
+                }
+            }
+            "<>" => {
+                // not equal (with wildcard semantics for strings)
+                // If rhs has wildcards and db_val is string, do regex; else use compare_values != 0
+                if let CalcResult::String(s) = db_val {
+                    if criteria.contains('*') || criteria.contains('?') {
+                        if let Ok(re) = from_wildcard_to_regex(&criteria.to_lowercase(), true) {
+                            return !result_matches_regex(
+                                &CalcResult::String(s.to_lowercase()),
+                                &re,
+                            );
+                        }
+                    }
+                }
+                let rhs = if let Some(n) = rhs_num {
+                    CalcResult::Number(n)
+                } else {
+                    CalcResult::String(criteria.to_lowercase())
+                };
+                let lhs = match db_val {
+                    CalcResult::String(s) => CalcResult::String(s.to_lowercase()),
+                    x => x.clone(),
+                };
+                compare_values(&lhs, &rhs) != 0
+            }
+            _ => {
+                // equality. For strings, support wildcards (*, ?)
+                if let Some(n) = rhs_num {
+                    // numeric equals
+                    if let CalcResult::Number(m) = db_val {
+                        (*m - n).abs() <= f64::EPSILON
+                    } else {
+                        compare_values(db_val, &CalcResult::Number(n)) == 0
+                    }
+                } else {
+                    // textual/boolean equals (case-insensitive), wildcard-enabled for strings
+                    if let CalcResult::String(s) = db_val {
+                        if criteria.contains('*') || criteria.contains('?') {
+                            if let Ok(re) = from_wildcard_to_regex(&criteria.to_lowercase(), true) {
+                                return result_matches_regex(
+                                    &CalcResult::String(s.to_lowercase()),
+                                    &re,
+                                );
+                            }
+                        }
+                        // This is weird but we only need to check if "starts with" for equality
+                        return s.to_lowercase().starts_with(&criteria.to_lowercase());
+                    }
+                    // Fallback: compare_values equality
+                    compare_values(db_val, &CalcResult::String(criteria.to_lowercase())) == 0
+                }
+            }
+        }
+    }
+
+    /// Shared implementation for DMAX/DMIN
+    fn db_extreme(
+        &mut self,
+        args: &[Node],
+        cell: CellReferenceIndex,
+        want_max: bool,
+    ) -> CalcResult {
+        if args.len() != 3 {
+            return CalcResult::new_args_number_error(cell);
+        }
+
+        let (db_left, db_right) = match self.get_reference(&args[0], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        let field_col = match self.resolve_db_field_column(db_left, db_right, &args[1], cell) {
+            Ok(c) => c,
+            Err(e) => return e,
+        };
+
+        let criteria = match self.get_reference(&args[2], cell) {
+            Ok(r) => (r.left, r.right),
+            Err(e) => return e,
+        };
+
+        if db_right.row <= db_left.row {
+            // no data rows
+            return CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "No data rows in database".to_string(),
+            };
+        }
+
+        let mut best: Option<f64> = None;
+
+        let mut row = db_left.row + 1;
+        while row <= db_right.row {
+            if self.db_row_matches_criteria(db_left, db_right, row, criteria) {
+                let v = self.evaluate_cell(CellReferenceIndex {
+                    sheet: db_left.sheet,
+                    row,
+                    column: field_col,
+                });
+                if let CalcResult::Number(value) = v {
+                    if value.is_finite() {
+                        best = Some(match best {
+                            None => value,
+                            Some(cur) => {
+                                if want_max {
+                                    value.max(cur)
+                                } else {
+                                    value.min(cur)
+                                }
+                            }
+                        });
+                    }
+                }
+            }
+            row += 1;
+        }
+
+        match best {
+            Some(v) => CalcResult::Number(v),
+            None => CalcResult::Number(0.0),
+        }
+    }
+}

base/src/functions/date_and_time.rs

@@ -8,6 +8,26 @@ use chrono::Timelike;
 const SECONDS_PER_DAY: i32 = 86_400;
 const SECONDS_PER_DAY_F64: f64 = SECONDS_PER_DAY as f64;
 
+fn is_leap_year(year: i32) -> bool {
+    (year % 4 == 0) && (year % 100 != 0 || year % 400 == 0)
+}
+
+fn is_feb_29_between_dates(start: chrono::NaiveDate, end: chrono::NaiveDate) -> bool {
+    let start_year = start.year();
+    let end_year = end.year();
+
+    for year in start_year..=end_year {
+        if is_leap_year(year)
+            && (year < end_year
+                || (year == end_year && end.month() > 2)
+                    && (year > start_year || (year == start_year && start.month() <= 2)))
+        {
+            return true;
+        }
+    }
+    false
+}
+
 // ---------------------------------------------------------------------------
 // Helper macros to eliminate boilerplate in date/time component extraction
 // functions (DAY, MONTH, YEAR, HOUR, MINUTE, SECOND).
@@ -1567,18 +1587,44 @@ impl Model {
                 }
             }
             1 => {
-                let year_days = if start_date.year() == end_date.year() {
+                // Procedure E
-                    if (start_date.year() % 4 == 0 && start_date.year() % 100 != 0)
+
-                        || start_date.year() % 400 == 0
+                let start_year = start_date.year();
-                    {
+                let end_year = end_date.year();
-                        366.0
+
+                let step_a = start_year != end_year;
+                let step_b = start_year + 1 != end_year;
+                let step_c = start_date.month() < end_date.month();
+                let step_d = start_date.month() == end_date.month();
+                let step_e = start_date.day() <= end_date.day();
+                let step_f = step_a && (step_b || step_c || (step_d && step_e));
+                if step_f {
+                    // 7.
+                    // return average of days in year between start_year and end_year, inclusive
+                    let mut total_days = 0;
+                    for year in start_year..=end_year {
+                        if is_leap_year(year) {
+                            total_days += 366;
                         } else {
-                        365.0
+                            total_days += 365;
                         }
+                    }
+                    days / (total_days as f64 / (end_year - start_year + 1) as f64)
+                } else if step_a && is_leap_year(start_year) {
+                    // 8.
+                    days / 366.0
+                } else if is_feb_29_between_dates(start_date, end_date) {
+                    // 9. If a February 29 occurs between date1 and date2 then return 366
+                    days / 366.0
+                } else if end_date.month() == 2 && end_date.day() == 29 {
+                    // 10. If date2 is February 29 then return 366
+                    days / 366.0
+                } else if !step_a && is_leap_year(start_year) {
+                    days / 366.0
                 } else {
-                    365.0
+                    // 11.
-                };
+                    days / 365.0
-                days / year_days
+                }
             }
             2 => days / 360.0,
             3 => days / 365.0,
@@ -1595,6 +1641,34 @@ impl Model {
             }
             _ => return CalcResult::new_error(Error::NUM, cell, "Invalid basis".to_string()),
         };
-        CalcResult::Number(result)
+        CalcResult::Number(result.abs())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used)]
+    use super::*;
+
+    #[test]
+    fn test_is_leap_year() {
+        assert!(is_leap_year(2000));
+        assert!(!is_leap_year(1900));
+        assert!(is_leap_year(2004));
+        assert!(!is_leap_year(2001));
+    }
+
+    #[test]
+    fn test_is_feb_29_between_dates() {
+        let d1 = chrono::NaiveDate::from_ymd_opt(2020, 2, 28).unwrap();
+        let d2 = chrono::NaiveDate::from_ymd_opt(2020, 3, 1).unwrap();
+        assert!(is_feb_29_between_dates(d1, d2));
+    }
+
+    #[test]
+    fn test_is_feb_29_between_dates_false() {
+        let d1 = chrono::NaiveDate::from_ymd_opt(2021, 2, 28).unwrap();
+        let d2 = chrono::NaiveDate::from_ymd_opt(2021, 3, 1).unwrap();
+        assert!(!is_feb_29_between_dates(d1, d2));
     }
 }

base/src/functions/engineering/bessel.rs

@@ -1,10 +1,12 @@
+use statrs::function::erf::{erf, erfc};
+
 use crate::{
     calc_result::CalcResult,
     expressions::{parser::Node, token::Error, types::CellReferenceIndex},
     model::Model,
 };
 
-use super::transcendental::{bessel_i, bessel_j, bessel_k, bessel_y, erf};
+use super::transcendental::{bessel_i, bessel_j, bessel_k, bessel_y};
 // https://root.cern/doc/v610/TMath_8cxx_source.html
 
 // Notice that the parameters for Bessel functions in Excel and here have inverted order
@@ -160,7 +162,7 @@ impl Model {
             Ok(f) => f,
             Err(s) => return s,
         };
-        CalcResult::Number(1.0 - erf(x))
+        CalcResult::Number(erfc(x))
     }
 
     pub(crate) fn fn_erfcprecise(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
@@ -171,6 +173,6 @@ impl Model {
             Ok(f) => f,
             Err(s) => return s,
         };
-        CalcResult::Number(1.0 - erf(x))
+        CalcResult::Number(erfc(x))
     }
 }

base/src/functions/engineering/transcendental/erf.rs

@@ -1,53 +0,0 @@
-pub(crate) fn erf(x: f64) -> f64 {
-    let cof = vec![
-        -1.3026537197817094,
-        6.419_697_923_564_902e-1,
-        1.9476473204185836e-2,
-        -9.561_514_786_808_63e-3,
-        -9.46595344482036e-4,
-        3.66839497852761e-4,
-        4.2523324806907e-5,
-        -2.0278578112534e-5,
-        -1.624290004647e-6,
-        1.303655835580e-6,
-        1.5626441722e-8,
-        -8.5238095915e-8,
-        6.529054439e-9,
-        5.059343495e-9,
-        -9.91364156e-10,
-        -2.27365122e-10,
-        9.6467911e-11,
-        2.394038e-12,
-        -6.886027e-12,
-        8.94487e-13,
-        3.13092e-13,
-        -1.12708e-13,
-        3.81e-16,
-        7.106e-15,
-        -1.523e-15,
-        -9.4e-17,
-        1.21e-16,
-        -2.8e-17,
-    ];
-
-    let mut d = 0.0;
-    let mut dd = 0.0;
-
-    let x_abs = x.abs();
-
-    let t = 2.0 / (2.0 + x_abs);
-    let ty = 4.0 * t - 2.0;
-
-    for j in (1..=cof.len() - 1).rev() {
-        let tmp = d;
-        d = ty * d - dd + cof[j];
-        dd = tmp;
-    }
-
-    let res = t * f64::exp(-x_abs * x_abs + 0.5 * (cof[0] + ty * d) - dd);
-    if x < 0.0 {
-        res - 1.0
-    } else {
-        1.0 - res
-    }
-}

base/src/functions/engineering/transcendental/mod.rs

@@ -4,7 +4,6 @@ mod bessel_j1_y1;
 mod bessel_jn_yn;
 mod bessel_k;
 mod bessel_util;
-mod erf;
 
 #[cfg(test)]
 mod test_bessel;
@@ -13,4 +12,3 @@ pub(crate) use bessel_i::bessel_i;
 pub(crate) use bessel_jn_yn::jn as bessel_j;
 pub(crate) use bessel_jn_yn::yn as bessel_y;
 pub(crate) use bessel_k::bessel_k;
-pub(crate) use erf::erf;

base/src/functions/information.rs

@@ -1,6 +1,6 @@
 use crate::{
     calc_result::CalcResult,
-    expressions::{parser::Node, token::Error, types::CellReferenceIndex},
+    expressions::{parser::Node, token::Error, types::CellReferenceIndex, utils::number_to_column},
     model::{Model, ParsedDefinedName},
 };
 
@@ -320,4 +320,150 @@ impl Model {
             message: "Invalid name".to_string(),
         }
     }
+
+    pub(crate) fn fn_n(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let arg_count = args.len();
+        if arg_count != 1 {
+            return CalcResult::new_args_number_error(cell);
+        }
+        let value = match self.evaluate_node_in_context(&args[0], cell) {
+            CalcResult::Number(n) => n,
+            CalcResult::String(_) => 0.0,
+            CalcResult::Boolean(f) => {
+                if f {
+                    1.0
+                } else {
+                    0.0
+                }
+            }
+            CalcResult::EmptyCell | CalcResult::EmptyArg => 0.0,
+            error @ CalcResult::Error { .. } => return error,
+            CalcResult::Range { .. } => {
+                return CalcResult::Error {
+                    error: Error::NIMPL,
+                    origin: cell,
+                    message: "Arrays not supported yet".to_string(),
+                }
+            }
+            CalcResult::Array(_) => {
+                return CalcResult::Error {
+                    error: Error::NIMPL,
+                    origin: cell,
+                    message: "Arrays not supported yet".to_string(),
+                }
+            }
+        };
+
+        CalcResult::Number(value)
+    }
+
+    pub(crate) fn fn_sheets(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let arg_count = args.len();
+        if arg_count > 1 {
+            return CalcResult::new_args_number_error(cell);
+        }
+        if arg_count == 1 {
+            return CalcResult::Error {
+                error: Error::NIMPL,
+                origin: cell,
+                message: "Sheets function with an argument is not implemented".to_string(),
+            };
+        }
+        let sheet_count = self.workbook.worksheets.len() as f64;
+        CalcResult::Number(sheet_count)
+    }
+
+    pub(crate) fn fn_cell(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        let arg_count = args.len();
+        if arg_count == 0 || arg_count > 2 {
+            return CalcResult::new_args_number_error(cell);
+        }
+        let reference = if arg_count == 2 {
+            match self.evaluate_node_with_reference(&args[1], cell) {
+                CalcResult::Range { left, right: _ } => {
+                    // we just take the left cell of the range
+                    left
+                }
+                _ => {
+                    return CalcResult::Error {
+                        error: Error::VALUE,
+                        origin: cell,
+                        message: "Argument must be a reference".to_string(),
+                    }
+                }
+            }
+        } else {
+            CellReferenceIndex {
+                sheet: cell.sheet,
+                row: cell.row,
+                column: cell.column,
+            }
+        };
+        let info_type = match self.get_string(&args[0], cell) {
+            Ok(s) => s.to_uppercase(),
+            Err(e) => return e,
+        };
+        match info_type.as_str() {
+            "ADDRESS" => {
+                if reference.sheet != cell.sheet {
+                    return CalcResult::Error {
+                        error: Error::NIMPL,
+                        origin: cell,
+                        message: "References to other sheets not implemented".to_string(),
+                    };
+                }
+                let column = match number_to_column(reference.column) {
+                    Some(c) => c,
+                    None => {
+                        return CalcResult::Error {
+                            error: Error::VALUE,
+                            origin: cell,
+                            message: "Invalid column".to_string(),
+                        }
+                    }
+                };
+                let address = format!("${}${}", column, reference.row);
+                CalcResult::String(address)
+            }
+            "COL" => CalcResult::Number(reference.column as f64),
+            "COLOR" | "FILENAME" | "FORMAT" | "PARENTHESES" | "PREFIX" | "PROTECT" | "WIDTH" => {
+                CalcResult::Error {
+                    error: Error::VALUE,
+                    origin: cell,
+                    message: "info_type not implemented".to_string(),
+                }
+            }
+            "CONTENTS" => self.evaluate_cell(reference),
+            "ROW" => CalcResult::Number(reference.row as f64),
+            "TYPE" => {
+                let cell_type = match self.evaluate_cell(reference) {
+                    CalcResult::EmptyCell => "b",
+                    CalcResult::String(_) => "l",
+                    CalcResult::Number(_) => "v",
+                    CalcResult::Boolean(_) => "v",
+                    CalcResult::Error { .. } => "v",
+                    CalcResult::Range { .. } => "v",
+                    CalcResult::EmptyArg => "v",
+                    CalcResult::Array(_) => "v",
+                };
+                CalcResult::String(cell_type.to_string())
+            }
+            _ => CalcResult::Error {
+                error: Error::VALUE,
+                origin: cell,
+                message: "Invalid info_type".to_string(),
+            },
+        }
+    }
+
+    pub(crate) fn fn_info(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
+        if args.is_empty() || args.len() > 2 {
+            return CalcResult::new_args_number_error(cell);
+        }
+        CalcResult::Error {
+            error: Error::NIMPL,
+            origin: cell,
+            message: "Info function not implemented".to_string(),
+        }
+    }
 }

base/src/functions/macros.rs

@@ -68,14 +68,14 @@ macro_rules! single_number_fn {
                                 },
                                 // If String, parse to f64 then apply or #VALUE! error
                                 ArrayNode::String(s) => {
-                                    let node = match s.parse::<f64>() {
+                                    let node = match self.cast_number(&s) {
-                                        Ok(f) => match $op(f) {
+                                        Some(f) => match $op(f) {
                                             Ok(x) => ArrayNode::Number(x),
                                             Err(Error::DIV) => ArrayNode::Error(Error::DIV),
                                             Err(Error::VALUE) => ArrayNode::Error(Error::VALUE),
                                             Err(e) => ArrayNode::Error(e),
                                         },
-                                        Err(_) => ArrayNode::Error(Error::VALUE),
+                                        None => ArrayNode::Error(Error::VALUE),
                                     };
                                     data_row.push(node);
                                 }

base/src/functions/math_util.rs

@@ -0,0 +1,200 @@
+/// Parse Roman (classic or Excel variants) → number
+pub fn from_roman(s: &str) -> Result<u32, String> {
+    if s.is_empty() {
+        return Err("empty numeral".into());
+    }
+    fn val(c: char) -> Option<u32> {
+        Some(match c {
+            'I' => 1,
+            'V' => 5,
+            'X' => 10,
+            'L' => 50,
+            'C' => 100,
+            'D' => 500,
+            'M' => 1000,
+            _ => return None,
+        })
+    }
+
+    // Accept the union of subtractive pairs used by the tables above (Excel-compatible).
+    fn allowed_subtractive(a: char, b: char) -> bool {
+        matches!(
+            (a, b),
+            // classic:
+            ('I','V')|('I','X')|('X','L')|('X','C')|('C','D')|('C','M')
+            // Excel forms:
+            |('V','L')|('L','D')|('L','M') // VL, LD, LM
+            |('X','D')|('X','M')          // XD, XM
+            |('V','M')                    // VM
+            |('I','L')|('I','C')|('I','D')|('I','M') // IL, IC, ID, IM
+            |('V','D')|('V','C') // VD, VC
+        )
+    }
+
+    let chars: Vec<char> = s.chars().map(|c| c.to_ascii_uppercase()).collect();
+    let mut total = 0u32;
+    let mut i = 0usize;
+
+    // Repetition rules similar to classic Romans:
+    // V, L, D cannot repeat; I, X, C, M max 3 in a row.
+    let mut last_char: Option<char> = None;
+    let mut run_len = 0usize;
+
+    while i < chars.len() {
+        let c = chars[i];
+        let v = val(c).ok_or_else(|| format!("invalid character '{c}'"))?;
+
+        if Some(c) == last_char {
+            run_len += 1;
+            match c {
+                'V' | 'L' | 'D' => return Err(format!("invalid repetition of '{c}'")),
+                _ if run_len >= 3 => return Err(format!("invalid repetition of '{c}'")),
+                _ => {}
+            }
+        } else {
+            last_char = Some(c);
+            run_len = 0;
+        }
+
+        if i + 1 < chars.len() {
+            let c2 = chars[i + 1];
+            let v2 = val(c2).ok_or_else(|| format!("invalid character '{c2}'"))?;
+            if v < v2 {
+                if !allowed_subtractive(c, c2) {
+                    return Err(format!("invalid subtractive pair '{c}{c2}'"));
+                }
+                // Disallow stacked subtractives like IIV, XXL:
+                if run_len > 0 {
+                    return Err(format!("malformed numeral near position {i}"));
+                }
+                total += v2 - v;
+                i += 2;
+                last_char = None;
+                run_len = 0;
+                continue;
+            }
+        }
+
+        total += v;
+        i += 1;
+    }
+    Ok(total)
+}
+
+/// Classic Roman (strict) encoder used as a base for all forms.
+fn to_roman(mut n: u32) -> Result<String, String> {
+    if !(1..=3999).contains(&n) {
+        return Err("value out of range (must be 1..=3999)".into());
+    }
+
+    const MAP: &[(u32, &str)] = &[
+        (1000, "M"),
+        (900, "CM"),
+        (500, "D"),
+        (400, "CD"),
+        (100, "C"),
+        (90, "XC"),
+        (50, "L"),
+        (40, "XL"),
+        (10, "X"),
+        (9, "IX"),
+        (5, "V"),
+        (4, "IV"),
+        (1, "I"),
+    ];
+
+    let mut out = String::with_capacity(15);
+    for &(val, sym) in MAP {
+        while n >= val {
+            out.push_str(sym);
+            n -= val;
+        }
+        if n == 0 {
+            break;
+        }
+    }
+    Ok(out)
+}
+
+/// Excel/Google Sheets compatible ROMAN(number, [form]) encoder.
+/// `form`: 0..=4 (0=Classic, 4=Simplified).
+pub fn to_roman_with_form(n: u32, form: i32) -> Result<String, String> {
+    let mut s = to_roman(n)?;
+    if form == 0 {
+        return Ok(s);
+    }
+    if !(0..=4).contains(&form) {
+        return Err("form must be between 0 and 4".into());
+    }
+
+    // Base rules (apply for all f >= 1)
+    let base_rules: &[(&str, &str)] = &[
+        // C(D|M)XC -> L$1XL
+        ("CDXC", "LDXL"),
+        ("CMXC", "LMXL"),
+        // C(D|M)L -> L$1
+        ("CDL", "LD"),
+        ("CML", "LM"),
+        // X(L|C)IX -> V$1IV
+        ("XLIX", "VLIV"),
+        ("XCIX", "VCIV"),
+        // X(L|C)V -> V$1
+        ("XLV", "VL"),
+        ("XCV", "VC"),
+    ];
+
+    // Level 2 extra rules
+    let lvl2_rules: &[(&str, &str)] = &[
+        // V(L|C)IV -> I$1
+        ("VLIV", "IL"),
+        ("VCIV", "IC"),
+        // L(D|M)XL -> X$1
+        ("LDXL", "XD"),
+        ("LMXL", "XM"),
+        // L(D|M)VL -> X$1V
+        ("LDVL", "XDV"),
+        ("LMVL", "XMV"),
+        // L(D|M)IL -> X$1IX
+        ("LDIL", "XDIX"),
+        ("LMIL", "XMIX"),
+    ];
+
+    // Level 3 extra rules
+    let lvl3_rules: &[(&str, &str)] = &[
+        // X(D|M)V -> V$1
+        ("XDV", "VD"),
+        ("XMV", "VM"),
+        // X(D|M)IX -> V$1IV
+        ("XDIX", "VDIV"),
+        ("XMIX", "VMIV"),
+    ];
+
+    // Level 4 extra rules
+    let lvl4_rules: &[(&str, &str)] = &[
+        // V(D|M)IV -> I$1
+        ("VDIV", "ID"),
+        ("VMIV", "IM"),
+    ];
+
+    // Helper to apply a batch of (from -> to) globally, in order.
+    fn apply_rules(mut t: String, rules: &[(&str, &str)]) -> String {
+        for (from, to) in rules {
+            if t.contains(from) {
+                t = t.replace(from, to);
+            }
+        }
+        t
+    }
+
+    s = apply_rules(s, base_rules);
+    if form >= 2 {
+        s = apply_rules(s, lvl2_rules);
+    }
+    if form >= 3 {
+        s = apply_rules(s, lvl3_rules);
+    }
+    if form >= 4 {
+        s = apply_rules(s, lvl4_rules);
+    }
+    Ok(s)
+}

base/src/functions/mod.rs

@@ -8,6 +8,7 @@ use crate::{
 };
 
 pub(crate) mod binary_search;
+mod database;
 mod date_and_time;
 mod engineering;
 mod financial;
@@ -16,6 +17,7 @@ mod information;
 mod logical;
 mod lookup_and_reference;
 mod macros;
+mod math_util;
 mod mathematical;
 mod statistical;
 mod subtotal;
@@ -76,6 +78,43 @@ pub enum Function {
     Sumifs,
     Tan,
     Tanh,
+    Acot,
+    Acoth,
+    Cot,
+    Coth,
+    Csc,
+    Csch,
+    Sec,
+    Sech,
+    Exp,
+    Fact,
+    Factdouble,
+    Sign,
+    Radians,
+    Degrees,
+    Int,
+    Even,
+    Odd,
+    Ceiling,
+    CeilingMath,
+    CeilingPrecise,
+    Floor,
+    FloorMath,
+    FloorPrecise,
+    IsoCeiling,
+    Mod,
+    Quotient,
+    Mround,
+    Trunc,
+    Gcd,
+    Lcm,
+    Base,
+    Decimal,
+    Roman,
+    Arabic,
+    Combin,
+    Combina,
+    Sumsq,
 
     // Information
     ErrorType,
@@ -96,6 +135,11 @@ pub enum Function {
     Sheet,
     Type,
 
+    Sheets,
+    N,
+    Cell,
+    Info,
+
     // Lookup and reference
     Hlookup,
     Index,
@@ -267,10 +311,24 @@ pub enum Function {
     Delta,
     Gestep,
     Subtotal,
+
+    // Database
+    Daverage,
+    Dcount,
+    Dget,
+    Dmax,
+    Dmin,
+    Dsum,
+    Dcounta,
+    Dproduct,
+    Dstdev,
+    Dvar,
+    Dvarp,
+    Dstdevp,
 }
 
 impl Function {
-    pub fn into_iter() -> IntoIter<Function, 215> {
+    pub fn into_iter() -> IntoIter<Function, 268> {
         [
             Function::And,
             Function::False,
@@ -303,12 +361,44 @@ impl Function {
             Function::Sqrt,
             Function::Sqrtpi,
             Function::Atan2,
+            Function::Acot,
+            Function::Acoth,
+            Function::Cot,
+            Function::Coth,
+            Function::Csc,
+            Function::Csch,
+            Function::Sec,
+            Function::Sech,
             Function::Power,
+            Function::Exp,
+            Function::Fact,
+            Function::Factdouble,
+            Function::Sign,
+            Function::Int,
+            Function::Even,
+            Function::Odd,
+            Function::Ceiling,
+            Function::CeilingMath,
+            Function::CeilingPrecise,
+            Function::Floor,
+            Function::FloorMath,
+            Function::FloorPrecise,
+            Function::IsoCeiling,
+            Function::Mod,
+            Function::Quotient,
+            Function::Mround,
+            Function::Trunc,
+            Function::Gcd,
+            Function::Lcm,
+            Function::Base,
+            Function::Decimal,
             Function::Max,
             Function::Min,
             Function::Product,
             Function::Rand,
             Function::Randbetween,
+            Function::Radians,
+            Function::Degrees,
             Function::Round,
             Function::Rounddown,
             Function::Roundup,
@@ -487,6 +577,27 @@ impl Function {
             Function::Delta,
             Function::Gestep,
             Function::Subtotal,
+            Function::Roman,
+            Function::Arabic,
+            Function::Combin,
+            Function::Combina,
+            Function::Sumsq,
+            Function::N,
+            Function::Cell,
+            Function::Info,
+            Function::Sheets,
+            Function::Daverage,
+            Function::Dcount,
+            Function::Dget,
+            Function::Dmax,
+            Function::Dmin,
+            Function::Dsum,
+            Function::Dcounta,
+            Function::Dproduct,
+            Function::Dstdev,
+            Function::Dvar,
+            Function::Dvarp,
+            Function::Dstdevp,
         ]
         .into_iter()
     }
@@ -529,6 +640,26 @@ impl Function {
             Function::Sheet => "_xlfn.SHEET".to_string(),
             Function::Formulatext => "_xlfn.FORMULATEXT".to_string(),
             Function::Isoweeknum => "_xlfn.ISOWEEKNUM".to_string(),
+            Function::Ceiling => "_xlfn.CEILING".to_string(),
+            Function::CeilingMath => "_xlfn.CEILING.MATH".to_string(),
+            Function::CeilingPrecise => "_xlfn.CEILING.PRECISE".to_string(),
+            Function::FloorMath => "_xlfn.FLOOR.MATH".to_string(),
+            Function::FloorPrecise => "_xlfn.FLOOR.PRECISE".to_string(),
+            Function::IsoCeiling => "_xlfn.ISO.CEILING".to_string(),
+            Function::Base => "_xlfn.BASE".to_string(),
+            Function::Decimal => "_xlfn.DECIMAL".to_string(),
+            Function::Arabic => "_xlfn.ARABIC".to_string(),
+            Function::Combina => "_xlfn.COMBINA".to_string(),
+            Function::Sheets => "_xlfn.SHEETS".to_string(),
+            Function::Acoth => "_xlfn.ACOTH".to_string(),
+            Function::Cot => "_xlfn.COT".to_string(),
+            Function::Coth => "_xlfn.COTH".to_string(),
+            Function::Csc => "_xlfn.CSC".to_string(),
+            Function::Csch => "_xlfn.CSCH".to_string(),
+            Function::Sec => "_xlfn.SEC".to_string(),
+            Function::Sech => "_xlfn.SECH".to_string(),
+            Function::Acot => "_xlfn.ACOT".to_string(),
+
             _ => self.to_string(),
         }
     }
@@ -551,34 +682,61 @@ impl Function {
             "SWITCH" | "_XLFN.SWITCH" => Some(Function::Switch),
             "TRUE" => Some(Function::True),
             "XOR" | "_XLFN.XOR" => Some(Function::Xor),
-
             "SIN" => Some(Function::Sin),
             "COS" => Some(Function::Cos),
             "TAN" => Some(Function::Tan),
-
             "ASIN" => Some(Function::Asin),
             "ACOS" => Some(Function::Acos),
             "ATAN" => Some(Function::Atan),
-
             "SINH" => Some(Function::Sinh),
             "COSH" => Some(Function::Cosh),
             "TANH" => Some(Function::Tanh),
-
             "ASINH" => Some(Function::Asinh),
             "ACOSH" => Some(Function::Acosh),
             "ATANH" => Some(Function::Atanh),
-
+            "ACOT" | "_XLFN.ACOT" => Some(Function::Acot),
+            "COTH" | "_XLFN.COTH" => Some(Function::Coth),
+            "COT" | "_XLFN.COT" => Some(Function::Cot),
+            "CSC" | "_XLFN.CSC" => Some(Function::Csc),
+            "CSCH" | "_XLFN.CSCH" => Some(Function::Csch),
+            "SEC" | "_XLFN.SEC" => Some(Function::Sec),
+            "SECH" | "_XLFN.SECH" => Some(Function::Sech),
+            "ACOTH" | "_XLFN.ACOTH" => Some(Function::Acoth),
+            "FACT" => Some(Function::Fact),
+            "FACTDOUBLE" => Some(Function::Factdouble),
+            "EXP" => Some(Function::Exp),
+            "SIGN" => Some(Function::Sign),
+            "RADIANS" => Some(Function::Radians),
+            "DEGREES" => Some(Function::Degrees),
+            "INT" => Some(Function::Int),
+            "EVEN" => Some(Function::Even),
+            "ODD" => Some(Function::Odd),
+            "CEILING" | "_XLFN.CEILING" => Some(Function::Ceiling),
+            "CEILING.MATH" | "_XLFN.CEILING.MATH" => Some(Function::CeilingMath),
+            "CEILING.PRECISE" | "_XLFN.CEILING.PRECISE" => Some(Function::CeilingPrecise),
+            "FLOOR" => Some(Function::Floor),
+            "FLOOR.MATH" | "_XLFN.FLOOR.MATH" => Some(Function::FloorMath),
+            "FLOOR.PRECISE" | "_XLFN.FLOOR.PRECISE" => Some(Function::FloorPrecise),
+            "ISO.CEILING" | "_XLFN.ISO.CEILING" => Some(Function::IsoCeiling),
+            "MOD" => Some(Function::Mod),
+            "QUOTIENT" => Some(Function::Quotient),
+            "MROUND" => Some(Function::Mround),
+            "TRUNC" => Some(Function::Trunc),
+            "GCD" => Some(Function::Gcd),
+            "LCM" => Some(Function::Lcm),
+            "BASE" | "_XLFN.BASE" => Some(Function::Base),
+            "DECIMAL" | "_XLFN.DECIMAL" => Some(Function::Decimal),
+            "ROMAN" => Some(Function::Roman),
+            "ARABIC" | "_XLFN.ARABIC" => Some(Function::Arabic),
             "PI" => Some(Function::Pi),
             "ABS" => Some(Function::Abs),
             "SQRT" => Some(Function::Sqrt),
             "SQRTPI" => Some(Function::Sqrtpi),
             "POWER" => Some(Function::Power),
             "ATAN2" => Some(Function::Atan2),
-
             "LN" => Some(Function::Ln),
             "LOG" => Some(Function::Log),
             "LOG10" => Some(Function::Log10),
-
             "MAX" => Some(Function::Max),
             "MIN" => Some(Function::Min),
             "PRODUCT" => Some(Function::Product),
@@ -590,6 +748,9 @@ impl Function {
             "SUM" => Some(Function::Sum),
             "SUMIF" => Some(Function::Sumif),
             "SUMIFS" => Some(Function::Sumifs),
+            "COMBIN" => Some(Function::Combin),
+            "COMBINA" | "_XLFN.COMBINA" => Some(Function::Combina),
+            "SUMSQ" => Some(Function::Sumsq),
 
             // Lookup and Reference
             "CHOOSE" => Some(Function::Choose),
@@ -777,6 +938,25 @@ impl Function {
             "GESTEP" => Some(Function::Gestep),
 
             "SUBTOTAL" => Some(Function::Subtotal),
+
+            "N" => Some(Function::N),
+            "CELL" => Some(Function::Cell),
+            "INFO" => Some(Function::Info),
+            "SHEETS" | "_XLFN.SHEETS" => Some(Function::Sheets),
+
+            "DAVERAGE" => Some(Function::Daverage),
+            "DCOUNT" => Some(Function::Dcount),
+            "DGET" => Some(Function::Dget),
+            "DMAX" => Some(Function::Dmax),
+            "DMIN" => Some(Function::Dmin),
+            "DSUM" => Some(Function::Dsum),
+            "DCOUNTA" => Some(Function::Dcounta),
+            "DPRODUCT" => Some(Function::Dproduct),
+            "DSTDEV" => Some(Function::Dstdev),
+            "DVAR" => Some(Function::Dvar),
+            "DVARP" => Some(Function::Dvarp),
+            "DSTDEVP" => Some(Function::Dstdevp),
+
             _ => None,
         }
     }
@@ -811,6 +991,14 @@ impl fmt::Display for Function {
             Function::Asinh => write!(f, "ASINH"),
             Function::Acosh => write!(f, "ACOSH"),
             Function::Atanh => write!(f, "ATANH"),
+            Function::Acot => write!(f, "ACOT"),
+            Function::Acoth => write!(f, "ACOTH"),
+            Function::Cot => write!(f, "COT"),
+            Function::Coth => write!(f, "COTH"),
+            Function::Csc => write!(f, "CSC"),
+            Function::Csch => write!(f, "CSCH"),
+            Function::Sec => write!(f, "SEC"),
+            Function::Sech => write!(f, "SECH"),
             Function::Abs => write!(f, "ABS"),
             Function::Pi => write!(f, "PI"),
             Function::Sqrt => write!(f, "SQRT"),
@@ -875,7 +1063,6 @@ impl fmt::Display for Function {
             Function::Isformula => write!(f, "ISFORMULA"),
             Function::Type => write!(f, "TYPE"),
             Function::Sheet => write!(f, "SHEET"),
-
             Function::Average => write!(f, "AVERAGE"),
             Function::Averagea => write!(f, "AVERAGEA"),
             Function::Averageif => write!(f, "AVERAGEIF"),
@@ -1000,8 +1187,53 @@ impl fmt::Display for Function {
             Function::Convert => write!(f, "CONVERT"),
             Function::Delta => write!(f, "DELTA"),
             Function::Gestep => write!(f, "GESTEP"),
-
             Function::Subtotal => write!(f, "SUBTOTAL"),
+            Function::Exp => write!(f, "EXP"),
+            Function::Fact => write!(f, "FACT"),
+            Function::Factdouble => write!(f, "FACTDOUBLE"),
+            Function::Sign => write!(f, "SIGN"),
+            Function::Radians => write!(f, "RADIANS"),
+            Function::Degrees => write!(f, "DEGREES"),
+            Function::Int => write!(f, "INT"),
+            Function::Even => write!(f, "EVEN"),
+            Function::Odd => write!(f, "ODD"),
+            Function::Ceiling => write!(f, "CEILING"),
+            Function::CeilingMath => write!(f, "CEILING.MATH"),
+            Function::CeilingPrecise => write!(f, "CEILING.PRECISE"),
+            Function::Floor => write!(f, "FLOOR"),
+            Function::FloorMath => write!(f, "FLOOR.MATH"),
+            Function::FloorPrecise => write!(f, "FLOOR.PRECISE"),
+            Function::IsoCeiling => write!(f, "ISO.CEILING"),
+            Function::Mod => write!(f, "MOD"),
+            Function::Quotient => write!(f, "QUOTIENT"),
+            Function::Mround => write!(f, "MROUND"),
+            Function::Trunc => write!(f, "TRUNC"),
+            Function::Gcd => write!(f, "GCD"),
+            Function::Lcm => write!(f, "LCM"),
+            Function::Base => write!(f, "BASE"),
+            Function::Decimal => write!(f, "DECIMAL"),
+            Function::Roman => write!(f, "ROMAN"),
+            Function::Arabic => write!(f, "ARABIC"),
+            Function::Combin => write!(f, "COMBIN"),
+            Function::Combina => write!(f, "COMBINA"),
+            Function::Sumsq => write!(f, "SUMSQ"),
+
+            Function::N => write!(f, "N"),
+            Function::Cell => write!(f, "CELL"),
+            Function::Info => write!(f, "INFO"),
+            Function::Sheets => write!(f, "SHEETS"),
+            Function::Daverage => write!(f, "DAVERAGE"),
+            Function::Dcount => write!(f, "DCOUNT"),
+            Function::Dget => write!(f, "DGET"),
+            Function::Dmax => write!(f, "DMAX"),
+            Function::Dmin => write!(f, "DMIN"),
+            Function::Dsum => write!(f, "DSUM"),
+            Function::Dcounta => write!(f, "DCOUNTA"),
+            Function::Dproduct => write!(f, "DPRODUCT"),
+            Function::Dstdev => write!(f, "DSTDEV"),
+            Function::Dvar => write!(f, "DVAR"),
+            Function::Dvarp => write!(f, "DVARP"),
+            Function::Dstdevp => write!(f, "DSTDEVP"),
         }
     }
 }
@@ -1030,7 +1262,6 @@ impl Model {
         cell: CellReferenceIndex,
     ) -> CalcResult {
         match kind {
-            // Logical
             Function::And => self.fn_and(args, cell),
             Function::False => self.fn_false(args, cell),
             Function::If => self.fn_if(args, cell),
@@ -1042,34 +1273,27 @@ impl Model {
             Function::Switch => self.fn_switch(args, cell),
             Function::True => self.fn_true(args, cell),
             Function::Xor => self.fn_xor(args, cell),
-            // Math and trigonometry
             Function::Log => self.fn_log(args, cell),
             Function::Log10 => self.fn_log10(args, cell),
             Function::Ln => self.fn_ln(args, cell),
             Function::Sin => self.fn_sin(args, cell),
             Function::Cos => self.fn_cos(args, cell),
             Function::Tan => self.fn_tan(args, cell),
-
             Function::Asin => self.fn_asin(args, cell),
             Function::Acos => self.fn_acos(args, cell),
             Function::Atan => self.fn_atan(args, cell),
-
             Function::Sinh => self.fn_sinh(args, cell),
             Function::Cosh => self.fn_cosh(args, cell),
             Function::Tanh => self.fn_tanh(args, cell),
-
             Function::Asinh => self.fn_asinh(args, cell),
             Function::Acosh => self.fn_acosh(args, cell),
             Function::Atanh => self.fn_atanh(args, cell),
-
             Function::Pi => self.fn_pi(args, cell),
             Function::Abs => self.fn_abs(args, cell),
-
             Function::Sqrt => self.fn_sqrt(args, cell),
             Function::Sqrtpi => self.fn_sqrtpi(args, cell),
             Function::Atan2 => self.fn_atan2(args, cell),
             Function::Power => self.fn_power(args, cell),
-
             Function::Max => self.fn_max(args, cell),
             Function::Min => self.fn_min(args, cell),
             Function::Product => self.fn_product(args, cell),
@@ -1081,8 +1305,6 @@ impl Model {
             Function::Sum => self.fn_sum(args, cell),
             Function::Sumif => self.fn_sumif(args, cell),
             Function::Sumifs => self.fn_sumifs(args, cell),
-
-            // Lookup and Reference
             Function::Choose => self.fn_choose(args, cell),
             Function::Column => self.fn_column(args, cell),
             Function::Columns => self.fn_columns(args, cell),
@@ -1096,7 +1318,6 @@ impl Model {
             Function::Rows => self.fn_rows(args, cell),
             Function::Vlookup => self.fn_vlookup(args, cell),
             Function::Xlookup => self.fn_xlookup(args, cell),
-            // Text
             Function::Concatenate => self.fn_concatenate(args, cell),
             Function::Exact => self.fn_exact(args, cell),
             Function::Value => self.fn_value(args, cell),
@@ -1114,7 +1335,6 @@ impl Model {
             Function::Trim => self.fn_trim(args, cell),
             Function::Unicode => self.fn_unicode(args, cell),
             Function::Upper => self.fn_upper(args, cell),
-            // Information
             Function::Isnumber => self.fn_isnumber(args, cell),
             Function::Isnontext => self.fn_isnontext(args, cell),
             Function::Istext => self.fn_istext(args, cell),
@@ -1132,7 +1352,6 @@ impl Model {
             Function::Isformula => self.fn_isformula(args, cell),
             Function::Type => self.fn_type(args, cell),
             Function::Sheet => self.fn_sheet(args, cell),
-            // Statistical
             Function::Average => self.fn_average(args, cell),
             Function::Averagea => self.fn_averagea(args, cell),
             Function::Averageif => self.fn_averageif(args, cell),
@@ -1145,7 +1364,6 @@ impl Model {
             Function::Maxifs => self.fn_maxifs(args, cell),
             Function::Minifs => self.fn_minifs(args, cell),
             Function::Geomean => self.fn_geomean(args, cell),
-            // Date and Time
             Function::Year => self.fn_year(args, cell),
             Function::Day => self.fn_day(args, cell),
             Function::Eomonth => self.fn_eomonth(args, cell),
@@ -1171,7 +1389,6 @@ impl Model {
             Function::WorkdayIntl => self.fn_workday_intl(args, cell),
             Function::Yearfrac => self.fn_yearfrac(args, cell),
             Function::Isoweeknum => self.fn_isoweeknum(args, cell),
-            // Financial
             Function::Pmt => self.fn_pmt(args, cell),
             Function::Pv => self.fn_pv(args, cell),
             Function::Rate => self.fn_rate(args, cell),
@@ -1205,7 +1422,6 @@ impl Model {
             Function::Db => self.fn_db(args, cell),
             Function::Cumprinc => self.fn_cumprinc(args, cell),
             Function::Cumipmt => self.fn_cumipmt(args, cell),
-            // Engineering
             Function::Besseli => self.fn_besseli(args, cell),
             Function::Besselj => self.fn_besselj(args, cell),
             Function::Besselk => self.fn_besselk(args, cell),
@@ -1260,8 +1476,60 @@ impl Model {
             Function::Convert => self.fn_convert(args, cell),
             Function::Delta => self.fn_delta(args, cell),
             Function::Gestep => self.fn_gestep(args, cell),
-
             Function::Subtotal => self.fn_subtotal(args, cell),
+            Function::Acot => self.fn_acot(args, cell),
+            Function::Acoth => self.fn_acoth(args, cell),
+            Function::Cot => self.fn_cot(args, cell),
+            Function::Coth => self.fn_coth(args, cell),
+            Function::Csc => self.fn_csc(args, cell),
+            Function::Csch => self.fn_csch(args, cell),
+            Function::Sec => self.fn_sec(args, cell),
+            Function::Sech => self.fn_sech(args, cell),
+            Function::Exp => self.fn_exp(args, cell),
+            Function::Fact => self.fn_fact(args, cell),
+            Function::Factdouble => self.fn_factdouble(args, cell),
+            Function::Sign => self.fn_sign(args, cell),
+            Function::Radians => self.fn_radians(args, cell),
+            Function::Degrees => self.fn_degrees(args, cell),
+            Function::Int => self.fn_int(args, cell),
+            Function::Even => self.fn_even(args, cell),
+            Function::Odd => self.fn_odd(args, cell),
+            Function::Ceiling => self.fn_ceiling(args, cell),
+            Function::CeilingMath => self.fn_ceiling_math(args, cell),
+            Function::CeilingPrecise => self.fn_ceiling_precise(args, cell),
+            Function::Floor => self.fn_floor(args, cell),
+            Function::FloorMath => self.fn_floor_math(args, cell),
+            Function::FloorPrecise => self.fn_floor_precise(args, cell),
+            Function::IsoCeiling => self.fn_iso_ceiling(args, cell),
+            Function::Mod => self.fn_mod(args, cell),
+            Function::Quotient => self.fn_quotient(args, cell),
+            Function::Mround => self.fn_mround(args, cell),
+            Function::Trunc => self.fn_trunc(args, cell),
+            Function::Gcd => self.fn_gcd(args, cell),
+            Function::Lcm => self.fn_lcm(args, cell),
+            Function::Base => self.fn_base(args, cell),
+            Function::Decimal => self.fn_decimal(args, cell),
+            Function::Roman => self.fn_roman(args, cell),
+            Function::Arabic => self.fn_arabic(args, cell),
+            Function::Combin => self.fn_combin(args, cell),
+            Function::Combina => self.fn_combina(args, cell),
+            Function::Sumsq => self.fn_sumsq(args, cell),
+            Function::N => self.fn_n(args, cell),
+            Function::Cell => self.fn_cell(args, cell),
+            Function::Info => self.fn_info(args, cell),
+            Function::Sheets => self.fn_sheets(args, cell),
+            Function::Daverage => self.fn_daverage(args, cell),
+            Function::Dcount => self.fn_dcount(args, cell),
+            Function::Dget => self.fn_dget(args, cell),
+            Function::Dmax => self.fn_dmax(args, cell),
+            Function::Dmin => self.fn_dmin(args, cell),
+            Function::Dsum => self.fn_dsum(args, cell),
+            Function::Dcounta => self.fn_dcounta(args, cell),
+            Function::Dproduct => self.fn_dproduct(args, cell),
+            Function::Dstdev => self.fn_dstdev(args, cell),
+            Function::Dvar => self.fn_dvar(args, cell),
+            Function::Dvarp => self.fn_dvarp(args, cell),
+            Function::Dstdevp => self.fn_dstdevp(args, cell),
         }
     }
 }

base/src/functions/util.rs

@@ -1,7 +1,10 @@
 #[cfg(feature = "use_regex_lite")]
 use regex_lite as regex;
 
-use crate::{calc_result::CalcResult, expressions::token::is_english_error_string};
+use crate::{
+    calc_result::CalcResult, expressions::token::is_english_error_string,
+    number_format::to_excel_precision,
+};
 
 /// This test for exact match (modulo case).
 ///   * strings are not cast into bools or numbers
@@ -34,6 +37,8 @@ pub(crate) fn values_are_equal(left: &CalcResult, right: &CalcResult) -> bool {
 pub(crate) fn compare_values(left: &CalcResult, right: &CalcResult) -> i32 {
     match (left, right) {
         (CalcResult::Number(value1), CalcResult::Number(value2)) => {
+            let value1 = to_excel_precision(*value1, 15);
+            let value2 = to_excel_precision(*value2, 15);
             if (value2 - value1).abs() < f64::EPSILON {
                 return 0;
             }

base/src/model.rs

@@ -2068,21 +2068,7 @@ impl Model {
         scope: Option<u32>,
         formula: &str,
     ) -> Result<(), String> {
-        if !is_valid_identifier(name) {
+        let sheet_id = self.is_valid_defined_name(name, scope, formula)?;
-            return Err("Invalid defined name".to_string());
-        };
-        let name_upper = name.to_uppercase();
-        let defined_names = &self.workbook.defined_names;
-        let sheet_id = match scope {
-            Some(index) => Some(self.workbook.worksheet(index)?.sheet_id),
-            None => None,
-        };
-        // if the defined name already exist return error
-        for df in defined_names {
-            if df.name.to_uppercase() == name_upper && df.sheet_id == sheet_id {
-                return Err("Defined name already exists".to_string());
-            }
-        }
         self.workbook.defined_names.push(DefinedName {
             name: name.to_string(),
             formula: formula.to_string(),
@@ -2093,6 +2079,48 @@ impl Model {
         Ok(())
     }
 
+    /// Validates if a defined name can be created
+    pub fn is_valid_defined_name(
+        &self,
+        name: &str,
+        scope: Option<u32>,
+        formula: &str,
+    ) -> Result<Option<u32>, String> {
+        if !is_valid_identifier(name) {
+            return Err("Name: Invalid defined name".to_string());
+        }
+        let name_upper = name.to_uppercase();
+        let defined_names = &self.workbook.defined_names;
+        let sheet_id = match scope {
+            Some(index) => match self.workbook.worksheet(index) {
+                Ok(ws) => Some(ws.sheet_id),
+                Err(_) => return Err("Scope: Invalid sheet index".to_string()),
+            },
+            None => None,
+        };
+        // if the defined name already exist return error
+        for df in defined_names {
+            if df.name.to_uppercase() == name_upper && df.sheet_id == sheet_id {
+                return Err("Name: Defined name already exists".to_string());
+            }
+        }
+
+        // Make sure the formula is valid
+        match common::ParsedReference::parse_reference_formula(
+            None,
+            formula,
+            &self.locale,
+            |name| self.get_sheet_index_by_name(name),
+        ) {
+            Ok(_) => {}
+            Err(_) => {
+                return Err("Formula: Invalid defined name formula".to_string());
+            }
+        };
+
+        Ok(sheet_id)
+    }
+
     /// Delete defined name of name and scope
     pub fn delete_defined_name(&mut self, name: &str, scope: Option<u32>) -> Result<(), String> {
         let name_upper = name.to_uppercase();
@@ -2126,7 +2154,7 @@ impl Model {
         new_formula: &str,
     ) -> Result<(), String> {
         if !is_valid_identifier(new_name) {
-            return Err("Invalid defined name".to_string());
+            return Err("Name: Invalid defined name".to_string());
         };
         let name_upper = name.to_uppercase();
         let new_name_upper = new_name.to_uppercase();
@@ -2134,18 +2162,28 @@ impl Model {
         if name_upper != new_name_upper || scope != new_scope {
             for key in self.parsed_defined_names.keys() {
                 if key.1.to_uppercase() == new_name_upper && key.0 == new_scope {
-                    return Err("Defined name already exists".to_string());
+                    return Err("Name: Defined name already exists".to_string());
                 }
             }
         }
         let defined_names = &self.workbook.defined_names;
         let sheet_id = match scope {
-            Some(index) => Some(self.workbook.worksheet(index)?.sheet_id),
+            Some(index) => Some(
+                self.workbook
+                    .worksheet(index)
+                    .map_err(|_| "Scope: Invalid sheet index")?
+                    .sheet_id,
+            ),
             None => None,
         };
 
         let new_sheet_id = match new_scope {
-            Some(index) => Some(self.workbook.worksheet(index)?.sheet_id),
+            Some(index) => Some(
+                self.workbook
+                    .worksheet(index)
+                    .map_err(|_| "Scope: Invalid sheet index")?
+                    .sheet_id,
+            ),
             None => None,
         };
 

base/src/number_format.rs

@@ -112,29 +112,36 @@ pub fn to_precision(value: f64, precision: usize) -> f64 {
 /// ```
 /// This intends to be equivalent to the js: `${parseFloat(value.toPrecision(precision)})`
 /// See ([ecma](https://tc39.es/ecma262/#sec-number.prototype.toprecision)).
-/// FIXME: There has to be a better algorithm :/
 pub fn to_excel_precision_str(value: f64) -> String {
     to_precision_str(value, 15)
 }
+
+pub fn to_excel_precision(value: f64, precision: usize) -> f64 {
+    if !value.is_finite() {
+        return value;
+    }
+
+    let s = format!("{:.*e}", precision.saturating_sub(1), value);
+    s.parse::<f64>().unwrap_or(value)
+}
+
 pub fn to_precision_str(value: f64, precision: usize) -> String {
+    if !value.is_finite() {
         if value.is_infinite() {
             return "inf".to_string();
-    }
+        } else {
-    if value.is_nan() {
             return "NaN".to_string();
         }
-    let exponent = value.abs().log10().floor();
+    }
-    let base = value / 10.0_f64.powf(exponent);
+
-    let base = format!("{0:.1$}", base, precision - 1);
+    let s = format!("{:.*e}", precision.saturating_sub(1), value);
-    let value = format!("{base}e{exponent}").parse::<f64>().unwrap_or({
+    let parsed = s.parse::<f64>().unwrap_or(value);
-        // TODO: do this in a way that does not require a possible error
+
-        0.0
-    });
     // I would love to use the std library. There is not a speed concern here
     // problem is it doesn't do the right thing
     // Also ryu is my favorite _modern_ algorithm
     let mut buffer = ryu::Buffer::new();
-    let text = buffer.format(value);
+    let text = buffer.format(parsed);
     // The above algorithm converts 2 to 2.0 regrettably
     if let Some(stripped) = text.strip_suffix(".0") {
         return stripped.to_string();

base/src/test/engineering/test_complex.rs

@@ -133,6 +133,7 @@ fn fn_imcot() {
     );
 }
 
+#[cfg_attr(target_os = "windows", ignore)]
 #[test]
 fn fn_imtan() {
     let mut model = new_empty_model();

base/src/test/mod.rs

@@ -9,6 +9,7 @@ mod test_currency;
 mod test_date_and_time;
 mod test_datedif_leap_month_end;
 mod test_days360_month_end;
+mod test_degrees_radians;
 mod test_error_propagation;
 mod test_fn_average;
 mod test_fn_averageifs;
@@ -68,12 +69,16 @@ mod test_geomean;
 mod test_get_cell_content;
 mod test_implicit_intersection;
 mod test_issue_155;
+mod test_issue_483;
 mod test_ln;
 mod test_log;
 mod test_log10;
+mod test_mod_quotient;
 mod test_networkdays;
+mod test_now;
 mod test_percentage;
 mod test_set_functions_error_handling;
+mod test_sheet_names;
 mod test_today;
 mod test_types;
 mod user_model;

base/src/test/test_arabic_roman

@@ -0,0 +1,27 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=ARABIC()");
+    model._set("A2", "=ARABIC(V)");
+    model._set("A3", "=ARABIC(V, 2)");
+
+    model._set("A4", "=ROMAN()");
+    model._set("A5", "=ROMAN(5)");
+    model._set("A6", "=ROMAN(5, 0)");
+    model._set("A7", "=ROMAN(5, 0, 2)");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"5");
+    assert_eq!(model._get_text("A3"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+    assert_eq!(model._get_text("A5"), *"V");
+    assert_eq!(model._get_text("A6"), *"V");
+    assert_eq!(model._get_text("A7"), *"#ERROR!");
+}

base/src/test/test_combin_combina

@@ -0,0 +1,27 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=COMBIN(5,2)");
+    model._set("A2", "=COMBINA(5,2)");
+    model._set("A3", "=COMBIN()");
+    model._set("A4", "=COMBINA()");
+    model._set("A5", "=COMBIN(2)");
+    model._set("A6", "=COMBINA(2)");
+    model._set("A5", "=COMBIN(1, 2, 3)");
+    model._set("A6", "=COMBINA(1, 2, 3)");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"10");
+    assert_eq!(model._get_text("A2"), *"15");
+    assert_eq!(model._get_text("A3"), *"#ERROR!");
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+    assert_eq!(model._get_text("A7"), *"#ERROR!");
+    assert_eq!(model._get_text("A8"), *"#ERROR!");
+}

base/src/test/test_date_and_time.rs

@@ -542,7 +542,6 @@ fn test_yearfrac_function() {
 
     // Edge cases
     model._set("A4", "=YEARFRAC(44561,44561,1)"); // Same date = 0
-    model._set("A5", "=YEARFRAC(44926,44561,1)"); // Reverse = negative
     model._set("A6", "=YEARFRAC(44197,44562,1)"); // Exact year (2021)
 
     // Error cases
@@ -559,7 +558,6 @@ fn test_yearfrac_function() {
 
     // Edge cases
     assert_eq!(model._get_text("A4"), *"0"); // Same date
-    assert_eq!(model._get_text("A5"), *"-1"); // Negative
     assert_eq!(model._get_text("A6"), *"1"); // Exact year
 
     // Error cases

base/src/test/test_degrees_radians.rs

@@ -0,0 +1,22 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn fn_degrees_radians_arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=DEGREES()");
+    model._set("A2", "=RADIANS()");
+    model._set("A3", "=RADIANS(180)");
+    model._set("A4", "=RADIANS(180, 2)");
+    model._set("A5", "=DEGREES(RADIANS(180))");
+    model._set("A6", "=DEGREES(1, 2)");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+    assert_eq!(model._get_text("A3"), *"3.141592654");
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+    assert_eq!(model._get_text("A5"), *"180");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+}

base/src/test/test_even_odd

@@ -0,0 +1,23 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=EVEN(2)");
+    model._set("A2", "=ODD(2)");
+    model._set("A3", "=EVEN()");
+    model._set("A4", "=ODD()");
+    model._set("A5", "=EVEN(1, 2)");
+    model._set("A6", "=ODD(1, 2)");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"2");
+    assert_eq!(model._get_text("A2"), *"3");
+    assert_eq!(model._get_text("A3"), *"#ERROR!");
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+}

base/src/test/test_exp_sign.rs

@@ -0,0 +1,26 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn fn_arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=EXP()");
+    model._set("A2", "=SIGN()");
+
+    model._set("A3", "=EXP(0)");
+    model._set("A4", "=SIGN(-10)");
+
+    model._set("A5", "=EXP(1, 2)");
+    model._set("A6", "=SIGN(1, 2)");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A3"), *"1");
+    assert_eq!(model._get_text("A4"), *"-1");
+
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+}

base/src/test/test_fn_datevalue_timevalue.rs

@@ -0,0 +1,24 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn datevalue_timevalue_arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=DATEVALUE()");
+    model._set("A2", "=TIMEVALUE()");
+    model._set("A3", "=DATEVALUE("2000-01-01")")
+    model._set("A4", "=TIMEVALUE("12:00:00")")
+    model._set("A5", "=DATEVALUE(1,2)");
+    model._set("A6", "=TIMEVALUE(1,2)");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+    assert_eq!(model._get_text("A3"), *"36526");
+    assert_eq!(model._get_text("A4"), *"0.5");
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+}
+
+

base/src/test/test_issue_483.rs

@@ -0,0 +1,13 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn issue_155() {
+    let mut model = new_empty_model();
+    model._set("A1", "123");
+    model._set("D2", "=-(A1^1.22)");
+    model.evaluate();
+
+    assert_eq!(model._get_formula("D2"), "=-(A1^1.22)".to_string());
+}

base/src/test/test_mod_quotient.rs

@@ -0,0 +1,22 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=MOD(5,2)");
+    model._set("A2", "=MOD()");
+    model._set("A3", "=MOD(5, 2, 1)");
+    model._set("A4", "=QUOTIENT(5, 2)");
+    model._set("A5", "=QUOTIENT()");
+    model._set("A6", "=QUOTIENT(5, 2, 1)");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"1");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+    assert_eq!(model._get_text("A3"), *"#ERROR!");
+    assert_eq!(model._get_text("A4"), *"2");
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+}

base/src/test/test_mround_trunc_int

@@ -0,0 +1,40 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=MROUND()");
+    model._set("A2", "=MROUND(10)");
+    model._set("A3", "=MROUND(10, 3)");
+    model._set("A4", "=MROUND(10, 3, 1)");
+
+    model._set("A5", "=TRUNC()");
+    model._set("A6", "=TRUNC(10)");
+    model._set("A7", "=TRUNC(10.22, 1)");
+    model._set("A8", "=TRUNC(10, 3, 1)");
+
+    model._set("A9", "=INT()");
+    model._set("A10", "=INT(10.22)");
+    model._set("A11", "=INT(10.22, 1)");
+    model._set("A12", "=INT(10.22, 1, 2)");
+
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+    assert_eq!(model._get_text("A3"), *"9");
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+    assert_eq!(model._get_text("A7"), *"10.2");
+    assert_eq!(model._get_text("A8"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A9"), *"#ERROR!");
+    assert_eq!(model._get_text("A10"), *"10");
+    assert_eq!(model._get_text("A11"), *"#ERROR!");
+    assert_eq!(model._get_text("A12"), *"#ERROR!");
+}

base/src/test/test_now.rs

@@ -0,0 +1,30 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::{mock_time, test::util::new_empty_model};
+
+// 14:44 20 Mar 2023 Berlin
+const TIMESTAMP_2023: i64 = 1679319865208;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+
+    model._set("A1", "=NOW(1)");
+    model.evaluate();
+
+    assert_eq!(
+        model._get_text("A1"),
+        "#ERROR!",
+        "NOW should not accept arguments"
+    );
+}
+
+#[test]
+fn returns_date_time() {
+    mock_time::set_mock_time(TIMESTAMP_2023);
+    let mut model = new_empty_model();
+    model._set("A1", "=NOW()");
+    model.evaluate();
+    let text = model._get_text("A1");
+    assert_eq!(text, *"20/03/2023 13:44:25");
+}

base/src/test/test_number_format.rs

@@ -8,6 +8,15 @@ fn test_simple_format() {
     assert_eq!(formatted.text, "2.3".to_string());
 }
 
+#[test]
+fn test_maximum_zeros() {
+    let formatted = format_number(1.0 / 3.0, "#,##0.0000000000000000000", "en");
+    assert_eq!(formatted.text, "0.3333333333333330000".to_string());
+
+    let formatted = format_number(1234.0 + 1.0 / 3.0, "#,##0.0000000000000000000", "en");
+    assert_eq!(formatted.text, "1,234.3333333333300000000".to_string());
+}
+
 #[test]
 #[ignore = "not yet implemented"]
 fn test_wrong_locale() {

base/src/test/test_sheet_names.rs

@@ -0,0 +1,16 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn sheet_number_name() {
+    let mut model = new_empty_model();
+    model.new_sheet();
+    model._set("A1", "7");
+    model._set("A2", "=Sheet2!C3");
+    model.evaluate();
+    model.rename_sheet("Sheet2", "2024").unwrap();
+    model.evaluate();
+    assert_eq!(model.workbook.get_worksheet_names(), ["Sheet1", "2024"]);
+    assert_eq!(model._get_text("A2"), "0");
+}

base/src/test/test_today.rs

@@ -33,7 +33,8 @@ fn now_basic_utc() {
     model.evaluate();
 
     assert_eq!(model._get_text("A1"), *"20/03/2023");
-    assert_eq!(model._get_text("A2"), *"45005.572511574");
+    // 45005.572511574
+    assert_eq!(model._get_text("A2"), *"20/03/2023 13:44:25");
 }
 
 #[test]
@@ -46,5 +47,5 @@ fn now_basic_europe_berlin() {
 
     assert_eq!(model._get_text("A1"), *"20/03/2023");
     // This is UTC + 1 hour: 45005.572511574 + 1/24
-    assert_eq!(model._get_text("A2"), *"45005.614178241");
+    assert_eq!(model._get_text("A2"), *"20/03/2023 14:44:25");
 }

base/src/test/test_trigonometric.rs

@@ -96,3 +96,14 @@ fn test_fn_tan_pi2() {
     // This is consistent with IEEE 754 but inconsistent with Excel
     assert_eq!(model._get_text("A1"), *"1.63312E+16");
 }
+
+#[test]
+fn test_trigonometric_identity() {
+    let mut model = new_empty_model();
+    model._set("A1", "=COTH(1)*CSCH(1)");
+    model._set("A2", "=COSH(1)/(SINH(1))^2");
+    model._set("A3", "=A1=A2");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A3"), *"TRUE");
+}

base/src/test/test_trigonometric_reciprocals.rs

@@ -0,0 +1,53 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn fn_arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=CSC()");
+    model._set("A2", "=SEC()");
+    model._set("A3", "=COT()");
+
+    model._set("A4", "=CSCH()");
+    model._set("A5", "=SECH()");
+    model._set("A6", "=COTH()");
+
+    model._set("A7", "=ACOT()");
+    model._set("A8", "=ACOTH()");
+
+    model._set("B1", "=CSC(1, 2)");
+    model._set("B2", "=SEC(1, 2)");
+    model._set("B3", "=COT(1, 2)");
+
+    model._set("B4", "=CSCH(1, 2)");
+    model._set("B5", "=SECH(1, 2)");
+    model._set("B6", "=COTH(1, 2)");
+
+    model._set("B7", "=ACOT(1, 2)");
+    model._set("B8", "=ACOTH(1, 2)");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+    assert_eq!(model._get_text("A3"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+    assert_eq!(model._get_text("A5"), *"#ERROR!");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A7"), *"#ERROR!");
+    assert_eq!(model._get_text("A8"), *"#ERROR!");
+
+    assert_eq!(model._get_text("B1"), *"#ERROR!");
+    assert_eq!(model._get_text("B2"), *"#ERROR!");
+    assert_eq!(model._get_text("B3"), *"#ERROR!");
+
+    assert_eq!(model._get_text("B4"), *"#ERROR!");
+    assert_eq!(model._get_text("B5"), *"#ERROR!");
+    assert_eq!(model._get_text("B6"), *"#ERROR!");
+
+    assert_eq!(model._get_text("B7"), *"#ERROR!");
+    assert_eq!(model._get_text("B8"), *"#ERROR!");
+}

base/src/test/test_yearfrac_basis.rs

@@ -26,8 +26,8 @@ fn test_yearfrac_basis_2_actual_360() {
         panic!("Expected numeric value in A2");
     }
 
-    // Negative symmetric of A1
+    // always positive A1
-    assert_eq!(model._get_text("A3"), *"-1");
+    assert_eq!(model._get_text("A3"), *"1");
 }
 
 #[test]

base/src/test/user_model/test_defined_names.rs

@@ -254,19 +254,19 @@ fn invalid_names() {
     // spaces
     assert_eq!(
         model.new_defined_name("A real", None, "Sheet1!$A$1"),
-        Err("Invalid defined name".to_string())
+        Err("Name: Invalid defined name".to_string())
     );
 
     // Starts with number
     assert_eq!(
         model.new_defined_name("2real", None, "Sheet1!$A$1"),
-        Err("Invalid defined name".to_string())
+        Err("Name: Invalid defined name".to_string())
     );
 
     // Updating also fails
     assert_eq!(
         model.update_defined_name("MyName", None, "My Name", None, "Sheet1!$A$1"),
-        Err("Invalid defined name".to_string())
+        Err("Name: Invalid defined name".to_string())
     );
 }
 
@@ -284,13 +284,13 @@ fn already_existing() {
     // Can't create a new name with the same name
     assert_eq!(
         model.new_defined_name("MyName", None, "Sheet1!$A$2"),
-        Err("Defined name already exists".to_string())
+        Err("Name: Defined name already exists".to_string())
     );
 
     // Can't update one into an existing
     assert_eq!(
         model.update_defined_name("Another", None, "MyName", None, "Sheet1!$A$1"),
-        Err("Defined name already exists".to_string())
+        Err("Name: Defined name already exists".to_string())
     );
 }
 
@@ -304,17 +304,17 @@ fn invalid_sheet() {
 
     assert_eq!(
         model.new_defined_name("Mything", Some(2), "Sheet1!$A$1"),
-        Err("Invalid sheet index".to_string())
+        Err("Scope: Invalid sheet index".to_string())
     );
 
     assert_eq!(
         model.update_defined_name("MyName", None, "MyName", Some(2), "Sheet1!$A$1"),
-        Err("Invalid sheet index".to_string())
+        Err("Scope: Invalid sheet index".to_string())
     );
 
     assert_eq!(
         model.update_defined_name("MyName", Some(9), "YourName", None, "Sheet1!$A$1"),
-        Err("Invalid sheet index".to_string())
+        Err("General: Failed to get old name".to_string())
     );
 }
 
@@ -322,7 +322,7 @@ fn invalid_sheet() {
 fn invalid_formula() {
     let mut model = UserModel::new_empty("model", "en", "UTC").unwrap();
     model.set_user_input(0, 1, 1, "Hello").unwrap();
-    model.new_defined_name("MyName", None, "A1").unwrap();
+    assert!(model.new_defined_name("MyName", None, "A1").is_err());
 
     model.set_user_input(0, 1, 2, "=MyName").unwrap();
 

base/src/types.rs

@@ -445,11 +445,13 @@ impl Default for Fill {
 
 #[derive(Serialize, Deserialize, Encode, Decode, Debug, PartialEq, Eq, Clone)]
 #[serde(rename_all = "lowercase")]
+#[derive(Default)]
 pub enum HorizontalAlignment {
     Center,
     CenterContinuous,
     Distributed,
     Fill,
+    #[default]
     General,
     Justify,
     Left,
@@ -457,11 +459,6 @@ pub enum HorizontalAlignment {
 }
 
 // Note that alignment in "General" depends on type
-impl Default for HorizontalAlignment {
-    fn default() -> Self {
-        Self::General
-    }
-}
 
 impl HorizontalAlignment {
     fn is_default(&self) -> bool {
@@ -487,7 +484,9 @@ impl Display for HorizontalAlignment {
 
 #[derive(Serialize, Deserialize, Encode, Decode, Debug, PartialEq, Eq, Clone)]
 #[serde(rename_all = "lowercase")]
+#[derive(Default)]
 pub enum VerticalAlignment {
+    #[default]
     Bottom,
     Center,
     Distributed,
@@ -501,12 +500,6 @@ impl VerticalAlignment {
     }
 }
 
-impl Default for VerticalAlignment {
-    fn default() -> Self {
-        Self::Bottom
-    }
-}
-
 impl Display for VerticalAlignment {
     fn fmt(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {

base/src/units.rs

@@ -329,6 +329,7 @@ impl Model {
             Function::Tbillyield => self.units_fn_percentage_2(args, cell),
             Function::Date => self.units_fn_dates(args, cell),
             Function::Today => self.units_fn_dates(args, cell),
+            Function::Now => self.units_fn_date_times(args, cell),
             _ => None,
         }
     }
@@ -375,4 +376,8 @@ impl Model {
         // TODO: update locale and use it here
         Some(Units::Date("dd/mm/yyyy".to_string()))
     }
+
+    fn units_fn_date_times(&self, _args: &[Node], _cell: &CellReferenceIndex) -> Option<Units> {
+        Some(Units::Date("dd/mm/yyyy hh:mm:ss".to_string()))
+    }
 }

base/src/user_model/common.rs

@@ -2001,7 +2001,10 @@ impl UserModel {
         new_scope: Option<u32>,
         new_formula: &str,
     ) -> Result<(), String> {
-        let old_formula = self.model.get_defined_name_formula(name, scope)?;
+        let old_formula = self
+            .model
+            .get_defined_name_formula(name, scope)
+            .map_err(|_| "General: Failed to get old name")?;
         let diff_list = vec![Diff::UpdateDefinedName {
             name: name.to_string(),
             scope,
@@ -2017,6 +2020,16 @@ impl UserModel {
         Ok(())
     }
 
+    /// validates a new defined name
+    pub fn is_valid_defined_name(
+        &self,
+        name: &str,
+        scope: Option<u32>,
+        formula: &str,
+    ) -> Result<Option<u32>, String> {
+        self.model.is_valid_defined_name(name, scope, formula)
+    }
+
     // **** Private methods ****** //
 
     pub(crate) fn push_diff_list(&mut self, diff_list: DiffList) {

bindings/wasm/src/lib.rs

@@ -5,7 +5,11 @@ use wasm_bindgen::{
 };
 
 use ironcalc_base::{
-    expressions::{lexer::util::get_tokens as tokenizer, types::Area, utils::number_to_column},
+    expressions::{
+        lexer::util::get_tokens as tokenizer,
+        types::Area,
+        utils::{number_to_column, quote_name as quote_name_ic},
+    },
     types::{CellType, Style},
     worksheet::NavigationDirection,
     BorderArea, ClipboardData, UserModel as BaseModel,
@@ -31,6 +35,11 @@ pub fn column_name_from_number(column: i32) -> Result<String, JsError> {
     }
 }
 
+#[wasm_bindgen(js_name = "quoteName")]
+pub fn quote_name(name: &str) -> String {
+    quote_name_ic(name)
+}
+
 #[derive(Serialize)]
 struct DefinedName {
     name: String,
@@ -766,4 +775,17 @@ impl Model {
             .get_first_non_empty_in_row_after_column(sheet, row, column)
             .map_err(to_js_error)
     }
+
+    #[wasm_bindgen(js_name = "isValidDefinedName")]
+    pub fn is_valid_defined_name(
+        &self,
+        name: &str,
+        scope: Option<u32>,
+        formula: &str,
+    ) -> Result<(), JsError> {
+        match self.model.is_valid_defined_name(name, scope, formula) {
+            Ok(_) => Ok(()),
+            Err(e) => Err(to_js_error(e.to_string())),
+        }
+    }
 }

docker-compose.yml

@@ -1,10 +1,12 @@
 services:
   server:
+    image: ghcr.io/ironcalc/ironcalc-server:0.6.0
     build:
       context: .
       target: server-runtime
 
   caddy:
+    image: ghcr.io/ironcalc/ironcalc-caddy:0.6.0
     build:
       context: .
       target: caddy-runtime

docs/package.json

@@ -6,7 +6,7 @@
   },
   "devDependencies": {
     "markdown-it-mathjax3": "^4.3.2",
-    "vitepress": "^v2.0.0-alpha.8",
+    "vitepress": "^v2.0.0-alpha.12",
     "vue": "^3.5.17"
   }
 }

docs/src/.vitepress/config.mts

@@ -2036,6 +2036,10 @@ export default defineConfig({
             text: "How to contribute",
             link: "/contributing/how-to-contribute",
           },
+          {
+            text: "Function documentation guide",
+            link: "/contributing/function-documentation-guide",
+          },
         ],
       },
     ],

docs/src/contributing/function-documentation-guide.md

@@ -0,0 +1,389 @@
+---
+layout: doc
+outline: deep
+lang: en-US
+---
+
+# Function Documentation Guide
+
+This guide explains how to document IronCalc functions following our established format and style conventions.
+
+## File Structure
+
+Function documentation files should be placed in the appropriate category directory under `src/functions/`. For example:
+
+- Financial functions: `src/functions/financial/function-name.md`
+- Text functions: `src/functions/text/function-name.md`
+- Logical functions: `src/functions/logical/function-name.md`
+
+## Required Frontmatter
+
+Every function documentation file must start with this frontmatter:
+
+```yaml
+---
+layout: doc
+outline: deep
+lang: en-US
+---
+```
+
+## Document Structure
+
+A complete function documentation should include the following sections in order:
+
+### 1. Title
+
+The title should be the function name followed by the word "function":
+
+```markdown
+# FV function
+```
+
+The function name should be written in uppercase when mentioned in the documentation.
+
+### 2. Draft Warning (Optional)
+
+If the function hasn't been implemented, include this warning box:
+
+```markdown
+::: warning
+**Note:** This draft page is under construction 🚧
+:::
+```
+
+If the function has been implemented but not documented, include this warning box:
+
+```markdown
+::: warning
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
+:::
+```
+
+### 3. Overview
+
+Provide a brief, clear description of what the function does. If the function name is an acronym, expand it using underlined text:
+
+```markdown
+## Overview
+
+FV (<u>F</u>uture <u>V</u>alue) is a function of the Financial category that can be used to predict the future value of an investment or asset based on its present value.
+```
+
+Include:
+
+- Category (Financial, Text, Logical, etc.)
+- Primary purpose
+- Key use cases (if helpful)
+
+### 4. Usage
+
+This section contains multiple subsections:
+
+#### 4.1 Syntax
+
+Format the function syntax with color-coded argument types. Use the following color scheme:
+
+- **Numbers**: `#2F80ED` (blue)
+- **Booleans**: `#27AE60` (green)
+- **Text/Strings**: `#2F80ED` (orange)
+- **Arrays/Ranges**: `#EB5757` (red)
+
+**Format:**
+
+```markdown
+### Syntax
+
+**FUNCTION_NAME(<span title="Type" style="color:#HEXCODE">arg1</span>, <span title="Type" style="color:#HEXCODE">arg2</span>=default, ...) => <span title="ReturnType" style="color:#HEXCODE">return_value</span>**
+```
+
+**Example:**
+
+**FV(<span title="Number" style="color:#2F80ED">rate</span>, <span title="Number" style="color:#2F80ED">nper</span>, <span title="Number" style="color:#2F80ED">pmt</span>, [<span title="Number" style="color:#2F80ED">pv</span>], [<span title="Boolean" style="color:#27AE60">type</span>]  => <span title="Number" style="color:#2F80ED">fv</span>**
+
+```markdown
+### Syntax
+
+**FV(<span title="Number" style="color:#2F80ED">rate</span>, <span title="Number" style="color:#2F80ED">nper</span>, <span title="Number" style="color:#2F80ED">pmt</span>, <span title="Number" style="color:#2F80ED">pv</span>=0, <span title="Boolean" style="color:#27AE60">type</span>=FALSE) => <span title="Number" style="color:#2F80ED">fv</span>**
+```
+
+**Guidelines:**
+
+- Use `title` attribute to specify the data type
+- Use `style="color:#HEXCODE"` for syntax highlighting
+- Use square brackets for optional arguments
+- Show the return type after `=>`
+- Make the entire syntax **bold**
+
+#### 4.2 Argument Descriptions
+
+List each argument with:
+
+- Argument name in _italics_
+- Data type link (e.g., `[number](/features/value-types#numbers)`)
+- Required or optional indicator
+- Description
+
+**Format:**
+
+```markdown
+### Argument descriptions
+
+- _argname_ ([datatype](/features/value-types#datatype), [required|optional](/features/optional-arguments.md)). Description of the argument.
+```
+
+**Example:**
+
+```markdown
+### Argument descriptions
+
+- _rate_ ([number](/features/value-types#numbers), required). The fixed percentage interest rate or yield per period.
+- _pv_ ([number](/features/value-types#numbers), [optional](/features/optional-arguments.md)). "pv" is the <u>p</u>resent <u>v</u>alue or starting amount of the asset (default 0).
+- _type_ ([Boolean](/features/value-types#booleans), [optional](/features/optional-arguments.md)). A logical value indicating whether the payment due dates are at the end (FALSE or 0) of the compounding periods or at the beginning (TRUE or any non-zero value). The default is FALSE when omitted.
+```
+
+**Guidelines:**
+
+- Use bullet points (`*`)
+- Italicize argument names with `*argname*`
+- Link to value types documentation
+- Link to optional arguments page when applicable
+- Expand acronyms in descriptions using `<u>` tags if helpful
+- Mention default values for optional arguments
+
+#### 4.3 Additional Guidance
+
+Provide tips, best practices and important notes about using the function:
+
+```markdown
+### Additional guidance
+
+- Make sure that the _rate_ argument specifies the interest rate or yield applicable to the compounding period.
+- The _pmt_ and _pv_ arguments should be expressed in the same currency unit.
+- To ensure a worthwhile result, one of the _pmt_ and _pv_ arguments should be non-zero.
+```
+
+#### 4.4 Returned Value
+
+Describe what the function returns:
+
+```markdown
+### Returned value
+
+FV returns a [number](/features/value-types#numbers) representing the future value expressed in the same [currency unit](/features/units) that was used for the _pmt_ and _pv_ arguments.
+```
+
+Include:
+
+- Return type (with link to value types if applicable)
+- Units or format if relevant
+- Any important characteristics
+
+#### 4.5 Error Conditions
+
+List all error scenarios the function may encounter:
+
+```markdown
+### Error conditions
+
+- In common with many other IronCalc functions, FV propagates errors that are found in any of its arguments.
+- If too few or too many arguments are supplied, FV returns the [`#ERROR!`](/features/error-types.md#error) error.
+- If the value of any of the _rate_, _nper_, _pmt_ or _pv_ arguments is not (or cannot be converted to) a [number](/features/value-types#numbers), then FV returns the [`#VALUE!`](/features/error-types.md#value) error.
+- If the value of the _type_ argument is not (or cannot be converted to) a [Boolean](/features/value-types#booleans), then FV again returns the [`#VALUE!`](/features/error-types.md#value) error.
+- For some combinations of valid argument values, FV may return a [`#NUM!`](/features/error-types.md#num) error or a [`#DIV/0!`](/features/error-types.md#div-0) error.
+```
+
+**Guidelines:**
+
+- Use bullet points
+- Format error types using backticks and link to the error types page: `` [`#ERROR!`](/features/error-types.md#error) ``
+- Reference argument names in italics when discussing specific arguments
+- Add the include directive at the end if using the error details snippet:
+
+```markdown
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+```
+
+### 5. Details (Optional but Recommended)
+
+For functions with mathematical formulas or complex behavior, include a Details section. This section can also include plots, graphs or charts to help clarify the function's behavior. 
+
+```markdown
+## Details
+
+- If $\text{type} \neq 0$, $\text{fv}$ is given by the equation:
+  $$ \text{fv} = -\text{pv} \times (1 + \text{rate})^\text{nper} - \dfrac{\text{pmt}\times\big({(1+\text{rate})^\text{nper}-1}\big) \times(1+\text{rate})}{\text{rate}}$$
+
+- If $\text{type} = 0$, $\text{fv}$ is given by the equation:
+  $$ \text{fv} = -\text{pv} \times (1 + \text{rate})^{\text{nper}} - \dfrac{\text{pmt}\times\big({(1+\text{rate})^\text{nper}-1}\big)}{\text{rate}}$$
+```
+
+**Guidelines:**
+
+- Use LaTeX math notation with `$` for inline and `$$` for block equations
+- Use `\text{}` for variable names in equations
+- Explain special cases or edge conditions
+
+### 6. Examples
+
+Link to interactive examples in IronCalc:
+
+```markdown
+## Examples
+
+[See some examples in IronCalc](https://app.ironcalc.com/?example=functionname).
+```
+
+Replace `functionname` with the actual function name (lowercase).
+
+### 7. Links
+
+Provide external references and related functions:
+
+```markdown
+## Links
+
+- For more information about the concept of "future value" in finance, visit Wikipedia's [Future value](https://en.wikipedia.org/wiki/Future_value) page.
+- See also IronCalc's [NPER](/functions/financial/nper), [PMT](/functions/financial/pmt), [PV](/functions/financial/pv) and [RATE](/functions/financial/rate) functions.
+- Visit Microsoft Excel's [FV function](https://support.microsoft.com/en-gb/office/fv-function-2eef9f44-a084-4c61-bdd8-4fe4bb1b71b3) page.
+- Both [Google Sheets](https://support.google.com/docs/answer/3093224) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/FV) provide versions of the FV function.
+```
+
+**Guidelines:**
+
+- Include Wikipedia links for concepts when available
+- Link to related IronCalc functions in the same category
+- Include links to equivalent functions in Excel, Google Sheets, and LibreOffice Calc
+- Use bullet points
+
+## Syntax Coloring Reference
+
+### Color Codes
+
+| Data Type   | Hex Color | Usage                                   |
+| ----------- | --------- | --------------------------------------- |
+| Number      | `#2F80ED` | All numeric arguments and return values |
+| Boolean     | `#27AE60` | TRUE/FALSE arguments                    |
+| Text/String | `#F2994A` | Text arguments                          |
+| Array/Range | `#EB5757` | Array or range arguments                |
+
+### Syntax Highlighting Template
+
+```html
+<span title="Type" style="color:#HEXCODE">argument_name</span>
+```
+
+**Examples:**
+
+- Number: `<span title="Number" style="color:#2F80ED">rate</span>`
+- Boolean: `<span title="Boolean" style="color:#27AE60">type</span>`
+- Text: `<span title="Text" style="color:#F2994A">text</span>`
+
+## Formatting Conventions
+
+### Text Formatting
+
+- **Function names**: Use exact case as in IronCalc
+- **Argument names**: Use _italics_ when referencing in prose
+- **Acronyms**: Expand using `<u>` tags: `<u>F</u>uture <u>V</u>alue`
+- **Code/values**: Use backticks for error codes: `` `#ERROR!` ``
+- **Links**: Use descriptive link text, not raw URLs
+
+### Section Headers
+
+- Use `#` for the page title with the function name (e.g., FV Function)
+- Use `##` for main sections (Overview, Usage, Details, Examples, Links)
+- Use `###` for subsections (Syntax, Argument descriptions, etc.)
+
+### Lists
+
+- Use bullet points (`*`) for argument descriptions and error conditions
+- Use numbered lists only when order matters
+
+## Checklist
+
+Before submitting a function documentation, ensure:
+
+- [ ] Frontmatter is correct
+- [ ] Title follows the format "FUNCTION_NAME function"
+- [ ] Overview clearly explains the function's purpose
+- [ ] Syntax is color-coded correctly
+- [ ] All arguments are documented with correct types
+- [ ] Required vs optional arguments are clearly marked
+- [ ] Return value is described
+- [ ] Error conditions are comprehensive
+- [ ] Examples link is included
+- [ ] Links section includes relevant references
+- [ ] Mathematical formulas (if any) use proper LaTeX syntax
+- [ ] All internal links use relative paths
+- [ ] Spelling and grammar are correct
+
+## Example Template
+
+```markdown
+---
+layout: doc
+outline: deep
+lang: en-US
+---
+
+# FUNCTION_NAME function
+
+::: warning
+**Note:** This draft page is under construction 🚧
+:::
+
+## Overview
+
+FUNCTION_NAME (<u>A</u>cronym <u>E</u>xplanation) is a function of the [Category] category that can be used to [primary purpose].
+
+[Additional context about when to use this function or related functions.]
+
+## Usage
+
+### Syntax
+
+**FUNCTION_NAME(<span title="Type" style="color:#2F80ED">arg1</span>, [<span title="Type" style="color:#2F80ED">arg2</span>], [<span title="Boolean" style="color:#27AE60">arg3</span>]) => <span title="Type" style="color:#2F80ED">return_value</span>**
+
+### Argument descriptions
+
+- _arg1_ ([type](/features/value-types#type), required). Description.
+- _arg2_ ([type](/features/value-types#type), [optional](/features/optional-arguments.md)). Description (default value).
+- _arg3_ ([Boolean](/features/value-types#booleans), [optional](/features/optional-arguments.md)). Description (default FALSE).
+
+### Additional guidance
+
+- Tip or best practice.
+- Another important note.
+
+### Returned value
+
+FUNCTION_NAME returns a [type](/features/value-types#type) representing [description].
+
+### Error conditions
+
+- General error propagation note.
+- Specific error condition with [`#ERROR!`](/features/error-types.md#error) link.
+- Another error condition.
+
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+## Details
+
+[Mathematical formulas or detailed explanations if needed]
+
+## Examples
+
+[See some examples in IronCalc](https://app.ironcalc.com/?example=functionname).
+
+## Links
+
+- Wikipedia link if applicable.
+- Related IronCalc functions.
+- Microsoft Excel documentation.
+- Google Sheets and LibreOffice Calc links.
+```
+
+## Questions?
+
+If you have questions about documenting functions, reach out on our [Discord Channel](https://discord.com/invite/zZYWfh3RHJ) or check existing function documentation for examples.

docs/src/contributing/how-to-contribute.md

@@ -6,4 +6,10 @@ lang: en-US
 
 # How to Contribute
 
-If you want to give us a hand, take a look at our [GitHub repository](https://github.com/ironcalc/IronCalc?tab=readme-ov-file#collaborators-needed-call-to-action), join our [Discord Channel](https://discord.com/invite/zZYWfh3RHJ) or send us an email to [hello@ironcalc.com](mailto:hello@ironcalc.com).
+If you want to give us a hand, take a look at our [GitHub repository](https://github.com/ironcalc/IronCalc?tab=readme-ov-file#collaborators-needed-call-to-action) – we've marked some issues there with the tag 'good first issue' that could serve you as a starting point.
+
+If you also want to discuss topics, share your thoughts or just say 'hi', you can join our [Discord Channel](https://discord.com/invite/zZYWfh3RHJ) or send us an email to [hello@ironcalc.com](mailto:hello@ironcalc.com).
+
+## Documentation
+
+If you're interested in contributing to our documentation, especially function documentation, please see our [Function Documentation Guide](/contributing/function-documentation-guide).

docs/src/features/value-types.md

@@ -68,6 +68,8 @@ Using IronCalc, a complex number is a string of the form "1+j3".
 
 ## Arrays
 
+## Ranges
+
 ## References
 
 A reference is a pointer to a single cell or a range of cells. The reference can either be entered manually, for example "A4", or as the result of a calculation, such as the OFFSET Function or the INDIRECT Function. A reference can also be built, for example with the Colon (\:) Operator. 

docs/src/functions/date-and-time.md

@@ -6,28 +6,27 @@ lang: en-US
 
 # Date and Time functions
 
-At the moment IronCalc only supports a few function in this section.  
+All Date and Time functions are already supported in IronCalc.
-You can track the progress in this [GitHub issue](https://github.com/ironcalc/IronCalc/issues/48).
 
 | Function         | Status                                         | Documentation |
 | ---------------- | ---------------------------------------------- | ------------- |
 | DATE             | <Badge type="tip" text="Available" />          | –             |
-| DATEDIF          | <Badge type="tip" text="Available" />          | [DATEDIF](date_and_time/datedif) |
+| DATEDIF          | <Badge type="tip" text="Available" />          | –             |
 | DATEVALUE        | <Badge type="tip" text="Available" />          | [DATEVALUE](date_and_time/datevalue) |
 | DAY              | <Badge type="tip" text="Available" />          | [DAY](date_and_time/day) |
 | DAYS             | <Badge type="tip" text="Available" />          | –             |
 | DAYS360          | <Badge type="tip" text="Available" />          | –             |
 | EDATE            | <Badge type="tip" text="Available" />          | –             |
 | EOMONTH          | <Badge type="tip" text="Available" />          | –             |
-| HOUR             | <Badge type="tip" text="Available" />          | [HOUR](date_and_time/hour) |
+| HOUR             | <Badge type="tip" text="Available" />          | –             |
 | ISOWEEKNUM       | <Badge type="tip" text="Available" />          | –             |
-| MINUTE           | <Badge type="tip" text="Available" />          | [MINUTE](date_and_time/minute) |
+| MINUTE           | <Badge type="tip" text="Available" />          | –             |
 | MONTH            | <Badge type="tip" text="Available" />          | [MONTH](date_and_time/month) |
 | NETWORKDAYS      | <Badge type="tip" text="Available" />          | [NETWORKDAYS](date_and_time/networkdays) |
 | NETWORKDAYS.INTL | <Badge type="tip" text="Available" />          | [NETWORKDAYS.INTL](date_and_time/networkdays.intl) |
 | NOW              | <Badge type="tip" text="Available" />          | –             |
-| SECOND           | <Badge type="tip" text="Available" />          | [SECOND](date_and_time/second) |
+| SECOND           | <Badge type="tip" text="Available" />          | –             |
-| TIME             | <Badge type="tip" text="Available" />          | [TIME](date_and_time/time) |
+| TIME             | <Badge type="tip" text="Available" />          | –             |
 | TIMEVALUE        | <Badge type="tip" text="Available" />          | [TIMEVALUE](date_and_time/timevalue) |
 | TODAY            | <Badge type="tip" text="Available" />          | –             |
 | WEEKDAY          | <Badge type="tip" text="Available" />          | –             |

docs/src/functions/date_and_time/datevalue.md

@@ -4,8 +4,41 @@ outline: deep
 lang: en-US
 ---
 
-# DATEVALUE
+# DATEVALUE function
 
-::: warning
+## Overview
-🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
+DATEVALUE is a function of the Date and Time category that converts a date stored as text to a [serial number](/features/serial-numbers.md) corresponding to a date value.
-:::
+
+## Usage
+### Syntax
+**DATEVALUE(<span title="Text" style="color:#1E88E5">date_text</span>) => <span title="Number" style="color:#1E88E5">datevalue</span>**
+
+### Argument descriptions
+* *date_text* ([text](/features/value-types#strings), required). A text string that represents a date in a known format. The text must represent a date between December 31, 1899 and December 31, 9999.
+
+### Additional guidance
+* If the year portion of the *date_text* argument is omitted, DATEVALUE uses the current year from the system clock.
+* Time information in the *date_text* argument is ignored. DATEVALUE processes only the date portion.
+
+### Returned value
+DATEVALUE returns a [number](/features/value-types#numbers) that represents the date as a [serial number](/features/serial-numbers.md). The serial number corresponds to the number of days since December 31, 1899.
+
+### Error conditions
+* In common with many other IronCalc functions, DATEVALUE propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then DATEVALUE returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *date_text* argument is not (or cannot be converted to) a [text](/features/value-types#strings) value, then DATEVALUE returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the *date_text* argument represents a date outside the valid range (before December 31, 1899 or after December 31, 9999), then DATEVALUE returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the *date_text* argument cannot be recognized as a valid date format, then DATEVALUE returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+<!-- ## Details
+For more information on how IronCalc processes Date and Time functions and values, visit [Date and Time](/features/serial-numbers.md) 
+
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=datevalue).
+-->
+
+## Links
+* See also IronCalc's [TIMEVALUE](/functions/date_and_time/timevalue.md) function for converting time text to serial numbers.
+* Visit Microsoft Excel's [DATEVALUE function](https://support.microsoft.com/en-us/office/datevalue-function-df8b07d4-7761-4a93-bc33-b7471bbff252) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093039) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/DATEVALUE) provide versions of the DATEVALUE function.

docs/src/functions/date_and_time/networkdays.intl.md

@@ -22,7 +22,7 @@ NETWORKDAYS.INTL is a function of the Date and Time category that calculates the
 * *start_date* ([number](/features/value-types#numbers), required). The start date expressed as a [serial number](/features/serial-numbers.md).
 * *end_date* ([number](/features/value-types#numbers), required). The end date expressed as a [serial number](/features/serial-numbers.md).
 * *weekend* ([number](/features/value-types#numbers) or [string](/features/value-types#strings), optional). Defines which days are considered weekends. Default is 1 (Saturday-Sunday).
-* *holidays* ([array](/features/value-types#arrays) or [range](/features/ranges), optional). A list of dates to exclude from the calculation, expressed as serial numbers.
+* *holidays* ([array](/features/value-types#arrays) or [range](/features/value-types#ranges), optional). A list of dates to exclude from the calculation, expressed as serial numbers.
 
 ### Weekend parameter options
 The _weekend_ parameter can be specified in two ways:

docs/src/functions/date_and_time/networkdays.md

@@ -21,7 +21,7 @@ NETWORKDAYS is a function of the Date and Time category that calculates the numb
 ### Argument descriptions
 * *start_date* ([number](/features/value-types#numbers), required). The start date expressed as a [serial number](/features/serial-numbers.md).
 * *end_date* ([number](/features/value-types#numbers), required). The end date expressed as a [serial number](/features/serial-numbers.md).
-* *holidays* ([array](/features/value-types#arrays) or [range](/features/ranges), optional). A list of dates to exclude from the calculation, expressed as serial numbers.
+* *holidays* ([array](/features/value-types#arrays) or [range](/features/value-types#ranges), optional). A list of dates to exclude from the calculation, expressed as serial numbers.
 
 ### Additional guidance
 - If the supplied _start_date_ and _end_date_ arguments have fractional parts, NETWORKDAYS uses their [floor values](https://en.wikipedia.org/wiki/Floor_and_ceiling_functions).

docs/src/functions/date_and_time/timevalue.md

@@ -4,9 +4,42 @@ outline: deep
 lang: en-US
 ---
 
-# TIMEVALUE
+# TIMEVALUE function
 
-::: warning
+## Overview
-**Note:** This draft page is under construction 🚧
+TIMEVALUE is a function of the Date and Time category that converts a time stored as text to a [serial number](/features/serial-numbers.md) corresponding to a time value. The serial number represents time as a decimal fraction of a 24-hour day (e.g., 0.5 represents 12:00:00 noon).
-The TIMEVALUE function is implemented and available in IronCalc.
+
-:::
+## Usage
+### Syntax
+**TIMEVALUE(<span title="Text" style="color:#1E88E5">time_text</span>) => <span title="Number" style="color:#1E88E5">timevalue</span>**
+
+### Argument descriptions
+* *time_text* ([text](/features/value-types#strings), required). A text string that represents a time in a known format. The text must represent a time between 00:00:00 and 23:59:59.
+
+### Additional guidance
+* Date information in the *time_text* argument is ignored. TIMEVALUE processes only the time portion.
+* The function can handle various time formats, including both 12-hour and 24-hour formats, as well as text that includes both date and time information.
+
+### Returned value
+TIMEVALUE returns a [number](/features/value-types#numbers) that represents the time as a [serial number](/features/serial-numbers.md). The serial number is a decimal fraction of a 24-hour day, where:
+* 0.0 represents 00:00:00 (midnight)
+* 0.5 represents 12:00:00 (midday)
+* 0.99999... represents 23:59:59 (just before midnight)
+
+### Error conditions
+* In common with many other IronCalc functions, TIMEVALUE propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then TIMEVALUE returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *time_text* argument is not (or cannot be converted to) a [text](/features/value-types#strings) value, then TIMEVALUE returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the *time_text* argument represents a time outside the valid range, then TIMEVALUE returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the *time_text* argument cannot be recognized as a valid time format, then TIMEVALUE returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=timevalue).
+-->
+
+## Links
+* See also IronCalc's [DATEVALUE](/functions/date_and_time/datevalue.md) function for converting date text to serial numbers.
+* Visit Microsoft Excel's [TIMEVALUE function](https://support.microsoft.com/en-us/office/timevalue-function-0b615c12-33d8-4431-bf3d-f3eb6d186645) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3267350) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/TIMEVALUE) provide versions of the TIMEVALUE function.

docs/src/functions/math-and-trigonometry.md

@@ -14,10 +14,10 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | ABS             | <Badge type="tip" text="Available" />          | –             |
 | ACOS            | <Badge type="tip" text="Available" />          | [ACOS](math_and_trigonometry/acos) |
 | ACOSH           | <Badge type="tip" text="Available" />          | [ACOSH](math_and_trigonometry/acosh) |
-| ACOT            | <Badge type="info" text="Not implemented yet" /> | –             |
+| ACOT            | <Badge type="tip" text="Available" />          | –             |
-| ACOTH           | <Badge type="info" text="Not implemented yet" /> | –             |
+| ACOTH           | <Badge type="tip" text="Available" />          | –             |
 | AGGREGATE       | <Badge type="info" text="Not implemented yet" /> | –             |
-| ARABIC          | <Badge type="info" text="Not implemented yet" /> | –             |
+| ARABIC          | <Badge type="tip" text="Available" />          | –             |
 | ASIN            | <Badge type="tip" text="Available" />          | [ASIN](math_and_trigonometry/asin) |
 | ASINH           | <Badge type="tip" text="Available" />          | [ASINH](math_and_trigonometry/asinh) |
 | ATAN            | <Badge type="tip" text="Available" />          | [ATAN](math_and_trigonometry/atan) |
@@ -27,64 +27,64 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | CEILING         | <Badge type="info" text="Not implemented yet" /> | –             |
 | CEILING.MATH    | <Badge type="info" text="Not implemented yet" /> | –             |
 | CEILING.PRECISE | <Badge type="info" text="Not implemented yet" /> | –             |
-| COMBIN          | <Badge type="info" text="Not implemented yet" /> | –             |
+| COMBIN          | <Badge type="tip" text="Available" />          | –             |
-| COMBINA         | <Badge type="info" text="Not implemented yet" /> | –             |
+| COMBINA         | <Badge type="tip" text="Available" />          | –             |
 | COS             | <Badge type="tip" text="Available" />          | [COS](math_and_trigonometry/cos) |
 | COSH            | <Badge type="tip" text="Available" />          | [COSH](math_and_trigonometry/cosh) |
-| COT             | <Badge type="info" text="Not implemented yet" /> | –             |
+| COT             | <Badge type="tip" text="Available" />          | –             |
-| COTH            | <Badge type="info" text="Not implemented yet" /> | –             |
+| COTH            | <Badge type="tip" text="Available" />          | –             |
-| CSC             | <Badge type="info" text="Not implemented yet" /> | –             |
+| CSC             | <Badge type="tip" text="Available" />          | –             |
-| CSCH            | <Badge type="info" text="Not implemented yet" /> | –             |
+| CSCH            | <Badge type="tip" text="Available" />          | –             |
 | DECIMAL         | <Badge type="info" text="Not implemented yet" /> | –             |
-| DEGREES         | <Badge type="info" text="Not implemented yet" /> | –             |
+| DEGREES         | <Badge type="tip" text="Available" /> | [DEGREES](math_and_trigonometry/degrees) |
-| EVEN            | <Badge type="info" text="Not implemented yet" /> | –             |
+| EVEN            | <Badge type="tip" text="Available" /> | [EVEN](math_and_trigonometry/even) |
-| EXP             | <Badge type="info" text="Not implemented yet" /> | –             |
+| EXP             | <Badge type="tip" text="Available" /> | –             |
 | FACT            | <Badge type="info" text="Not implemented yet" /> | –             |
 | FACTDOUBLE      | <Badge type="info" text="Not implemented yet" /> | –             |
 | FLOOR           | <Badge type="info" text="Not implemented yet" /> | –             |
 | FLOOR.MATH      | <Badge type="info" text="Not implemented yet" /> | –             |
 | FLOOR.PRECISE   | <Badge type="info" text="Not implemented yet" /> | –             |
 | GCD             | <Badge type="info" text="Not implemented yet" /> | –             |
-| INT             | <Badge type="info" text="Not implemented yet" /> | –             |
+| INT             | <Badge type="tip" text="Available" />          | –             |
 | ISO.CEILING     | <Badge type="info" text="Not implemented yet" /> | –             |
 | LCM             | <Badge type="info" text="Not implemented yet" /> | –             |
 | LET             | <Badge type="info" text="Not implemented yet" /> | –             |
-| LN              | <Badge type="info" text="Available" />           | –             |
+| LN              | <Badge type="tip" text="Available" />           | –             |
-| LOG             | <Badge type="info" text="Available" />           | –             |
+| LOG             | <Badge type="tip" text="Available" />           | –             |
-| LOG10           | <Badge type="info" text="Available" />           | –             |
+| LOG10           | <Badge type="tip" text="Available" />           | –             |
 | MDETERM         | <Badge type="info" text="Not implemented yet" /> | –             |
 | MINVERSE        | <Badge type="info" text="Not implemented yet" /> | –             |
 | MMULT           | <Badge type="info" text="Not implemented yet" /> | –             |
-| MOD             | <Badge type="info" text="Not implemented yet" /> | –             |
+| MOD             | <Badge type="tip" text="Available" />          | [MOD](math_and_trigonometry/mod) |
-| MROUND          | <Badge type="info" text="Not implemented yet" /> | –             |
+| MROUND          | <Badge type="tip" text="Available" />          | –             |
 | MULTINOMIAL     | <Badge type="info" text="Not implemented yet" /> | –             |
 | MUNIT           | <Badge type="info" text="Not implemented yet" /> | –             |
-| ODD             | <Badge type="info" text="Not implemented yet" /> | –             |
+| ODD             | <Badge type="tip" text="Available" /> | [ODD](math_and_trigonometry/odd) |
 | PI              | <Badge type="info" text="Not implemented yet" /> | –             |
 | POWER           | <Badge type="tip" text="Available" />          | –             |
 | PRODUCT         | <Badge type="tip" text="Available" />          | –             |
-| QUOTIENT        | <Badge type="info" text="Not implemented yet" /> | –             |
+| QUOTIENT        | <Badge type="tip" text="Available" /> | [QUOTIENT](math_and_trigonometry/quotient) |
-| RADIANS         | <Badge type="info" text="Not implemented yet" /> | –             |
+| RADIANS         | <Badge type="tip" text="Available" /> | [RADIANS](math_and_trigonometry/radians) |
 | RAND            | <Badge type="tip" text="Available" />          | –             |
 | RANDARRAY       | <Badge type="info" text="Not implemented yet" /> | –             |
 | RANDBETWEEN     | <Badge type="tip" text="Available" />          | –             |
-| ROMAN           | <Badge type="info" text="Not implemented yet" /> | –             |
+| ROMAN           | <Badge type="tip" text="Available" />          | –             |
 | ROUND           | <Badge type="tip" text="Available" />          | –             |
 | ROUNDDOWN       | <Badge type="tip" text="Available" />          | –             |
 | ROUNDUP         | <Badge type="tip" text="Available" />          | –             |
-| SEC             | <Badge type="info" text="Not implemented yet" /> | –             |
+| SEC             | <Badge type="tip" text="Available" />          | –             |
-| SECH            | <Badge type="info" text="Not implemented yet" /> | –             |
+| SECH            | <Badge type="tip" text="Available" />          | –             |
 | SERIESSUM       | <Badge type="info" text="Not implemented yet" /> | –             |
 | SEQUENCE        | <Badge type="info" text="Not implemented yet" /> | –             |
-| SIGN            | <Badge type="info" text="Not implemented yet" /> | –             |
+| SIGN            | <Badge type="tip" text="Available" /> | –             |
 | SIN             | <Badge type="tip" text="Available" />          | [SIN](math_and_trigonometry/sin) |
 | SINH            | <Badge type="tip" text="Available" />          | [SINH](math_and_trigonometry/sinh) |
 | SQRT            | <Badge type="tip" text="Available" />          | –             |
-| SQRTPI          | <Badge type="info" text="Available" />         | –             |
+| SQRTPI          | <Badge type="tip" text="Available" />         | –             |
 | SUBTOTAL        | <Badge type="info" text="Not implemented yet" /> | –             |
 | SUM             | <Badge type="tip" text="Available" />          | –             |
 | SUMIF           | <Badge type="tip" text="Available" />          | –             |
-| SUMIFS          | <Badge type="info" text="Available" />         | –             |
+| SUMIFS          | <Badge type="tip" text="Available" />         | –             |
 | SUMPRODUCT      | <Badge type="info" text="Not implemented yet" /> | –             |
 | SUMSQ           | <Badge type="info" text="Not implemented yet" /> | –             |
 | SUMX2MY2        | <Badge type="info" text="Not implemented yet" /> | –             |
@@ -92,4 +92,4 @@ You can track the progress in this [GitHub issue](https://github.com/ironcalc/Ir
 | SUMXMY2         | <Badge type="info" text="Not implemented yet" /> | –             |
 | TAN             | <Badge type="tip" text="Available" />          | [TAN](math_and_trigonometry/tan) |
 | TANH            | <Badge type="tip" text="Available" />          | [TANH](math_and_trigonometry/tanh) |
-| TRUNC           | <Badge type="info" text="Not implemented yet" /> | –             |
+| TRUNC           | <Badge type="tip" text="Available" />          | –             |

docs/src/functions/math_and_trigonometry/acot.md

@@ -7,6 +7,5 @@ lang: en-US
 # ACOT
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/acoth.md

@@ -7,6 +7,5 @@ lang: en-US
 # ACOTH
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/arabic.md

@@ -7,6 +7,5 @@ lang: en-US
 # ARABIC
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/combin.md

@@ -7,6 +7,5 @@ lang: en-US
 # COMBIN
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/combina.md

@@ -7,6 +7,5 @@ lang: en-US
 # COMBINA
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/cot.md

@@ -7,6 +7,5 @@ lang: en-US
 # COT
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/coth.md

@@ -7,6 +7,5 @@ lang: en-US
 # COTH
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/csc.md

@@ -7,6 +7,5 @@ lang: en-US
 # CSC
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/csch.md

@@ -7,6 +7,5 @@ lang: en-US
 # CSCH
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/degrees.md

@@ -4,9 +4,40 @@ outline: deep
 lang: en-US
 ---
 
-# DEGREES
+# DEGREES function
 
-::: warning
+## Overview
-🚧 This function is not yet available in IronCalc.
+DEGREES is a function of the Math and Trigonometry category that converts an angle measured in radians to an equivalent angle measured in degrees.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+
-:::
+## Usage
+### Syntax
+**DEGREES(<span title="Number" style="color:#1E88E5">angle</span>) => <span title="Number" style="color:#1E88E5">degrees</span>**
+
+### Argument descriptions
+* *angle* ([number](/features/value-types#numbers), required). The angle in radians that is to be converted to degrees.
+
+### Additional guidance
+The conversion from radians to degrees is based on the relationship:
+$$
+1~\:~\text{radian} = \dfrac{180}{\pi}~\text{degrees} \approx 57.29577951~\text{degrees}
+$$
+
+### Returned value
+DEGREES returns a [number](/features/value-types#numbers) that represents the value of the given angle expressed in degrees.
+
+### Error conditions
+* In common with many other IronCalc functions, DEGREES propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then DEGREES returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *angle* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then DEGREES returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=degrees).
+-->
+
+## Links
+* For more information about angle conversions, visit Wikipedia's [Degree (angle)](https://en.wikipedia.org/wiki/Degree_(angle)) page.
+* See also IronCalc's [RADIANS](/functions/math_and_trigonometry/radians) function for converting degrees to radians.
+* Visit Microsoft Excel's [DEGREES function](https://support.microsoft.com/en-us/office/degrees-function-4d6ec4db-e694-4b94-ace0-1cc3f61f9ba1) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093481) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/DEGREES) provide versions of the DEGREES function.

docs/src/functions/math_and_trigonometry/even.md

@@ -4,9 +4,41 @@ outline: deep
 lang: en-US
 ---
 
-# EVEN
+# EVEN function
 
-::: warning
+## Overview
-🚧 This function is not yet available in IronCalc.
+EVEN is a function of the Math and Trigonometry category that rounds a number up (away from zero) to the nearest even integer.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+
-:::
+## Usage
+### Syntax
+**EVEN(<span title="Number" style="color:#1E88E5">number</span>) => <span title="Number" style="color:#1E88E5">even</span>**
+
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The number that is to be rounded to the nearest even integer.
+
+### Additional guidance
+* EVEN rounds away from zero, meaning:
+  * Positive numbers are rounded up to the next even integer.
+  * Negative numbers are rounded down (toward negative infinity) to the next even integer.
+* If the *number* argument is already an even integer, EVEN returns it unchanged.
+* Since zero is considered an even number, the EVEN function returns 0 when *number* is 0.
+
+### Returned value
+EVEN returns a [number](/features/value-types#numbers) that is the nearest even integer, rounded away from zero.
+
+### Error conditions
+* In common with many other IronCalc functions, EVEN propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then EVEN returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then EVEN returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=even).
+-->
+
+## Links
+* For more information about even and odd numbers, visit Wikipedia's [Parity](https://en.wikipedia.org/wiki/Parity_(mathematics)) page.
+* See also IronCalc's [ODD](/functions/math_and_trigonometry/odd) function.
+* Visit Microsoft Excel's [EVEN function](https://support.microsoft.com/en-us/office/even-function-197b5f06-c795-4c1e-8696-3c3b8a646cf9) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093409) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/EVEN) provide versions of the EVEN function.

docs/src/functions/math_and_trigonometry/exp.md

@@ -7,6 +7,5 @@ lang: en-US
 # EXP
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/int.md

@@ -7,6 +7,5 @@ lang: en-US
 # INT
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/mod.md

@@ -4,9 +4,44 @@ outline: deep
 lang: en-US
 ---
 
-# MOD
+# MOD function
 
-::: warning
+## Overview
-🚧 This function is not yet available in IronCalc.
+MOD is a function of the Math and Trigonometry category that returns the remainder after one number (the dividend) is divided by another number (the divisor). The result has the same sign as the divisor.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+
-:::
+## Usage
+### Syntax
+**MOD(<span title="Number" style="color:#1E88E5">dividend</span>, <span title="Number" style="color:#1E88E5">divisor</span>) => <span title="Number" style="color:#1E88E5">remainder</span>**
+
+### Argument descriptions
+* *dividend* ([number](/features/value-types#numbers), required). The number whose remainder is to be calculated.
+* *divisor* ([number](/features/value-types#numbers), required). The number by which the dividend is divided.
+
+### Additional guidance
+None.
+
+### Returned value
+MOD returns a [number](/features/value-types#numbers) that is the remainder after division, with the same sign as the divisor.
+
+### Error conditions
+* In common with many other IronCalc functions, MOD propagates errors that are found in its arguments.
+* If no argument, or more than two arguments, are supplied, then MOD returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If either argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then MOD returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the value of the *divisor* argument is 0, then MOD returns the [`#DIV/0!`](/features/error-types.md#div-0) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+## Details
+* MOD follows the formula:
+$$
+\operatorname{MOD}(n, d) = n - d \times \operatorname{INT}\!\left(\dfrac{n}{d}\right)
+$$
+Since `INT` returns the greatest integer less than or equal to its argument (it rounds down), the remainder's sign matches the divisor, even though this might appear counterintuitive when the dividend and divisor have different signs.
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=mod).
+-->
+## Links
+* For more information about the modulo operation, visit Wikipedia's [Modulo](https://en.wikipedia.org/wiki/Modulo) page.
+* See also IronCalc's [QUOTIENT](/functions/math_and_trigonometry/quotient) function.
+* Visit Microsoft Excel's [MOD function](https://support.microsoft.com/en-us/office/mod-function-9b6cd169-b6ee-406a-a97b-edf2a9dc24f3) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093497) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/MOD) provide versions of the MOD function.

docs/src/functions/math_and_trigonometry/mround.md

@@ -7,6 +7,5 @@ lang: en-US
 # MROUND
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/odd.md

@@ -4,9 +4,41 @@ outline: deep
 lang: en-US
 ---
 
-# ODD
+# ODD function
 
-::: warning
+## Overview
-🚧 This function is not yet available in IronCalc.
+ODD is a function of the Math and Trigonometry category that rounds a number up (away from zero) to the nearest odd integer.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+
-:::
+## Usage
+### Syntax
+**ODD(<span title="Number" style="color:#1E88E5">number</span>) => <span title="Number" style="color:#1E88E5">odd</span>**
+
+### Argument descriptions
+* *number* ([number](/features/value-types#numbers), required). The number that is to be rounded to the nearest odd integer.
+
+### Additional guidance
+* ODD rounds away from zero, meaning:
+  * Positive numbers are rounded up to the next odd integer.
+  * Negative numbers are rounded down (toward negative infinity) to the next odd integer.
+* If the *number* argument is already an odd integer, ODD returns it unchanged.
+* Since zero is considered an even number, the ODD function returns 1 when *number* is 0.
+
+### Returned value
+ODD returns a [number](/features/value-types#numbers) that is the nearest odd integer, rounded away from zero.
+
+### Error conditions
+* In common with many other IronCalc functions, ODD propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then ODD returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *number* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then ODD returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=odd).
+-->
+
+## Links
+* For more information about even and odd numbers, visit Wikipedia's [Parity](https://en.wikipedia.org/wiki/Parity_(mathematics)) page.
+* See also IronCalc's [EVEN](/functions/math_and_trigonometry/even) function.
+* Visit Microsoft Excel's [ODD function](https://support.microsoft.com/en-us/office/odd-function-deae64eb-e08a-4c88-8b40-6d0b42575c98) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093499) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/ODD) provide versions of the ODD function.

docs/src/functions/math_and_trigonometry/quotient.md

@@ -4,9 +4,44 @@ outline: deep
 lang: en-US
 ---
 
-# QUOTIENT
+# QUOTIENT function
 
-::: warning
+## Overview
-🚧 This function is not yet available in IronCalc.
+QUOTIENT is a function of the Math and Trigonometry category that returns the integer portion of a division. It divides one number (dividend) by another (divisor) and discards the remainder by truncating toward zero.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+
-:::
+## Usage
+### Syntax
+**QUOTIENT(<span title="Number" style="color:#1E88E5">dividend</span>, <span title="Number" style="color:#1E88E5">divisor</span>) => <span title="Number" style="color:#1E88E5">quotient</span>**
+
+### Argument descriptions
+* *dividend* ([number](/features/value-types#numbers), required). The number to be divided.
+* *divisor* ([number](/features/value-types#numbers), required). The number by which to divide the dividend.
+
+### Additional guidance
+* QUOTIENT returns the integer part of the division and ignores any remainder. For negative results, it truncates toward zero.
+
+### Returned value
+QUOTIENT returns a [number](/features/value-types#numbers) that is the integer portion of the division of the dividend by the divisor.
+
+### Error conditions
+* In common with many other IronCalc functions, QUOTIENT propagates errors that are found in its arguments.
+* If no argument, or more than two arguments, are supplied, then QUOTIENT returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If either argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then QUOTIENT returns the [`#VALUE!`](/features/error-types.md#value) error.
+* If the value of the *divisor* argument is 0, then QUOTIENT returns the [`#DIV/0!`](/features/error-types.md#div-0) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+
+## Details
+* QUOTIENT corresponds to truncating the exact quotient toward zero:
+$$
+\operatorname{QUOTIENT}(n, d) = \operatorname{TRUNC}\!\left(\dfrac{n}{d}\right),\quad d \ne 0
+$$
+This differs from using `INT(n/d)` when the quotient is negative, because `INT` rounds down toward −∞, whereas `TRUNC` and QUOTIENT truncate toward zero.
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=quotient).
+-->
+## Links
+* For more information about the quotient, visit Wikipedia's [Quotient](https://en.wikipedia.org/wiki/Quotient) page.
+* See also IronCalc's [MOD](/functions/math_and_trigonometry/mod) function.
+* Visit Microsoft Excel's [QUOTIENT function](https://support.microsoft.com/en-gb/office/quotient-function-9f7bf099-2a18-4282-8fa4-65290cc99dee) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093436) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/QUOTIENT) provide versions of the QUOTIENT function.

docs/src/functions/math_and_trigonometry/radians.md

@@ -4,9 +4,38 @@ outline: deep
 lang: en-US
 ---
 
-# RADIANS
+# RADIANS function
 
-::: warning
+## Overview
-🚧 This function is not yet available in IronCalc.
+RADIANS is a function of the Math and Trigonometry category that converts an angle measured in degrees to an equivalent angle measured in radians.
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
+
-:::
+## Usage
+### Syntax
+**RADIANS(<span title="Number" style="color:#1E88E5">angle</span>) => <span title="Number" style="color:#1E88E5">radians</span>**
+
+### Argument descriptions
+* *angle* ([number](/features/value-types#numbers), required). The angle in degrees that is to be converted to radians.
+
+### Additional guidance
+The conversion from degrees to radians is based on the relationship:
+$$
+1~\:~\text{degree} = \dfrac{\pi}{180}~\text{radians} \approx 0.01745329252~\text{radians}
+$$
+
+### Returned value
+RADIANS returns a [number](/features/value-types#numbers) that represents the value of the given angle expressed in radians.
+
+### Error conditions
+* In common with many other IronCalc functions, RADIANS propagates errors that are found in its argument.
+* If no argument, or more than one argument, is supplied, then RADIANS returns the [`#ERROR!`](/features/error-types.md#error) error.
+* If the value of the *angle* argument is not (or cannot be converted to) a [number](/features/value-types#numbers), then RADIANS returns the [`#VALUE!`](/features/error-types.md#value) error.
+<!--@include: ../markdown-snippets/error-type-details.txt-->
+<!--
+## Examples
+[See some examples in IronCalc](https://app.ironcalc.com/?example=radians).
+-->
+## Links
+* For more information about angle conversions, visit Wikipedia's [Radian](https://en.wikipedia.org/wiki/Radian) page.
+* See also IronCalc's [DEGREES](/functions/math_and_trigonometry/degrees) function for converting radians to degrees.
+* Visit Microsoft Excel's [RADIANS function](https://support.microsoft.com/en-us/office/radians-function-907f0ede-ef2e-4f7b-911a-015e2f8ab878) page.
+* Both [Google Sheets](https://support.google.com/docs/answer/3093481) and [LibreOffice Calc](https://wiki.documentfoundation.org/Documentation/Calc_Functions/RADIANS) provide versions of the RADIANS function.

docs/src/functions/math_and_trigonometry/roman.md

@@ -7,6 +7,5 @@ lang: en-US
 # ROMAN
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/sec.md

@@ -7,6 +7,5 @@ lang: en-US
 # SEC
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/sech.md

@@ -7,6 +7,5 @@ lang: en-US
 # SECH
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/sign.md

@@ -7,6 +7,5 @@ lang: en-US
 # SIGN
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

docs/src/functions/math_and_trigonometry/trunc.md

@@ -7,6 +7,5 @@ lang: en-US
 # TRUNC
 
 ::: warning
-🚧 This function is not yet available in IronCalc.
+🚧 This function is implemented but currently lacks detailed documentation. For guidance, you may refer to the equivalent functionality in [Microsoft Excel documentation](https://support.microsoft.com/en-us/office/excel-functions-by-category-5f91f4e9-7b42-46d2-9bd1-63f26a86c0eb).
-[Follow development here](https://github.com/ironcalc/IronCalc/labels/Functions)
 :::

webapp/IronCalc/.storybook/main.ts

@@ -16,6 +16,9 @@ const config: StorybookConfig = {
     }
     config.server.fs.allow = ["../.."];
     return config;
-  }
+  },
+  core: {
+    disableTelemetry: true,
+  },
 };
 export default config;

webapp/IronCalc/biome.json

@@ -1,5 +1,4 @@
 {
-  "organizeImports": { "enabled": true },
   "linter": {
     "enabled": true,
     "rules": {

webapp/IronCalc/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@ironcalc/workbook",
-  "version": "0.3.2",
+  "version": "0.6.0",
   "type": "module",
   "main": "./dist/ironcalc.js",
   "module": "./dist/ironcalc.js",
@@ -18,31 +18,31 @@
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.0",
     "@ironcalc/wasm": "file:../../bindings/wasm/pkg",
-    "@mui/material": "^7.1.1",
+    "@mui/material": "^7.3.5",
-    "@mui/system": "^7.1.1",
+    "@mui/system": "^7.3.5",
-    "i18next": "^25.2.1",
+    "i18next": "^25.6.1",
-    "lucide-react": "^0.513.0",
+    "lucide-react": "^0.553.0",
     "react-colorful": "^5.6.1",
-    "react-i18next": "^15.5.2"
+    "react-i18next": "^16.2.2"
   },
   "devDependencies": {
-    "@biomejs/biome": "1.9.4",
+    "@biomejs/biome": "2.3.5",
-    "@storybook/react": "^9.0.5",
+    "@storybook/react": "^10.0.7",
-    "@storybook/react-vite": "^9.0.5",
+    "@storybook/react-vite": "^10.0.7",
     "@vitejs/plugin-react": "^4.2.1",
-    "react": "^19.1.0",
+    "react": "^19.2.0",
-    "react-dom": "^19.1.0",
+    "react-dom": "^19.2.0",
-    "storybook": "^9.0.5",
+    "storybook": "^10.0.7",
     "ts-node": "^10.9.2",
-    "typescript": "~5.8.3",
+    "typescript": "~5.9.3",
-    "vite": "^6.3.5",
+    "vite": "^7.2.2",
-    "vite-plugin-svgr": "^4.2.0",
+    "vite-plugin-svgr": "^4.5.0",
-    "vitest": "^3.2.2"
+    "vitest": "^4.0.8"
   },
   "peerDependencies": {
-    "@types/react": "^18.0.0 || ^19.0.0",
+    "@types/react": "^18.0.0 || ^19.2.0",
-    "react": "^18.0.0 || ^19.0.0",
+    "react": "^18.0.0 || ^19.2.0",
-    "react-dom": "^18.0.0 || ^19.0.0"
+    "react-dom": "^18.0.0 || ^19.2.0"
   },
   "files": [
     "dist"

webapp/IronCalc/src/components/ColorPicker/ColorPicker.tsx

@@ -173,8 +173,7 @@ const ColorPicker = ({
       <RecentLabel>{t("color_picker.custom")}</RecentLabel>
       <RecentColorsList>
         {recentColors.current.length > 0 ? (
-          <>
+          recentColors.current.map((recentColor) => (
-            {recentColors.current.map((recentColor) => (
             <ColorSwatch
               key={recentColor}
               $color={recentColor}
@@ -183,8 +182,7 @@ const ColorPicker = ({
                 handleColorSelect(recentColor);
               }}
             />
-            ))}
+          ))
-          </>
         ) : (
           <EmptyContainer />
         )}

webapp/IronCalc/src/components/Editor/util.tsx

@@ -1,9 +1,9 @@
 import {
+  getTokens,
   type Model,
   type Range,
   type Reference,
   type TokenType,
-  getTokens,
 } from "@ironcalc/wasm";
 import type { JSX } from "react";
 import type { ActiveRange } from "../workbookState";
@@ -197,4 +197,40 @@ function getFormulaHTML(
   return { html, activeRanges };
 }
 
+// Given a formula (without the equals sign) returns (sheetIndex, rowStart, columnStart, rowEnd, columnEnd)
+// if it represent a reference or range like `Sheet1!A1` or `Sheet3!D3:D10` in an existing sheet
+// If it is not a reference or range it returns null
+export function parseRangeInSheet(
+  model: Model,
+  formula: string,
+): [number, number, number, number, number] | null {
+  // HACK: We are checking here the series of tokens in the range formula.
+  // This is enough for our purposes but probably a more specific ranges in formula method  would be better.
+  const worksheets = model.getWorksheetsProperties();
+  const tokens = getTokens(formula);
+  const { token } = tokens[0];
+  if (tokenIsRangeType(token)) {
+    const {
+      sheet: refSheet,
+      left: { row: rowStart, column: columnStart },
+      right: { row: rowEnd, column: columnEnd },
+    } = token.Range;
+    if (refSheet !== null) {
+      const sheetIndex = worksheets.findIndex((s) => s.name === refSheet);
+      if (sheetIndex >= 0) {
+        return [sheetIndex, rowStart, columnStart, rowEnd, columnEnd];
+      }
+    }
+  } else if (tokenIsReferenceType(token)) {
+    const { sheet: refSheet, row, column } = token.Reference;
+    if (refSheet !== null) {
+      const sheetIndex = worksheets.findIndex((s) => s.name === refSheet);
+      if (sheetIndex >= 0) {
+        return [sheetIndex, row, column, row, column];
+      }
+    }
+  }
+  return null;
+}
+
 export default getFormulaHTML;