ISOWEEKNUM returns the wrong week number for dates that fall in the last days of December when ISO week 1 of the new year starts in December.
In 2026, January 1 falls on a Thursday. Per ISO 8601, Week 1 is defined as th…...Cells Product Family cells-net ronald.g March...Dec 29, 30, and 31. Aspose.Cells 26.1.0 incorrectly returns 53...