UPDATE: Dump of initial files

base/src/mock_time.rs

@@ -0,0 +1,22 @@
+use std::cell::RefCell;
+
+// main idea borrowed_mut from:
+// https://blog.iany.me/2019/03/how-to-mock-time-in-rust-tests-and-cargo-gotchas-we-met/
+// see also:
+// https://docs.rs/mock_instant/latest/mock_instant/
+
+// FIXME: This should be November 12 1955 06:38, of course
+// (or maybe OCT 21, 2015 07:28)
+// 8 November 2022 12:13 Berlin time
+
+thread_local! {
+    static MOCK_TIME: RefCell<i64> = RefCell::new(1667906008578);
+}
+
+pub fn get_milliseconds_since_epoch() -> i64 {
+    MOCK_TIME.with(|t| *t.borrow())
+}
+
+pub fn set_mock_time(time: i64) {
+    MOCK_TIME.with(|cell| *cell.borrow_mut() = time);
+}