From 2dbc3f47904dad492c3fe0299f7a5164870d64f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Hatcher?= <nicolas@theuniverse.today>
Date: Sat, 27 Sep 2025 19:05:31 +0200
Subject: [PATCH] FIX: DAYS and ISOWEEKNUM are "XLFN" functions

---
 base/src/functions/mod.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/base/src/functions/mod.rs b/base/src/functions/mod.rs
index 0e227bf..c829a1b 100644
--- a/base/src/functions/mod.rs
+++ b/base/src/functions/mod.rs
@@ -528,6 +528,7 @@ impl Function {
             Function::Isformula => "_xlfn.ISFORMULA".to_string(),
             Function::Sheet => "_xlfn.SHEET".to_string(),
             Function::Formulatext => "_xlfn.FORMULATEXT".to_string(),
+            Function::Isoweeknum => "_xlfn.ISOWEEKNUM".to_string(),
             _ => self.to_string(),
         }
     }
@@ -677,14 +678,14 @@ impl Function {
             "SECOND" => Some(Function::Second),
             "TODAY" => Some(Function::Today),
             "NOW" => Some(Function::Now),
-            "DAYS" => Some(Function::Days),
+            "DAYS" | "_XLFN.DAYS" => Some(Function::Days),
             "DAYS360" => Some(Function::Days360),
             "WEEKDAY" => Some(Function::Weekday),
             "WEEKNUM" => Some(Function::Weeknum),
             "WORKDAY" => Some(Function::Workday),
             "WORKDAY.INTL" => Some(Function::WorkdayIntl),
             "YEARFRAC" => Some(Function::Yearfrac),
-            "ISOWEEKNUM" => Some(Function::Isoweeknum),
+            "ISOWEEKNUM" | "_XLFN.ISOWEEKNUM" => Some(Function::Isoweeknum),
             // Financial
             "PMT" => Some(Function::Pmt),
             "PV" => Some(Function::Pv),