@water it's only 2 min work to skript the func. After 5 min "why 1 day to much?",  i read your wiki and followed the link, so now i know the known bug (leapyear 1900) is a feature in Excel to be compatible with Lotus 123 (they where first and have the bug also) so M$ must implement a func with this bug. But inserting in wiki is a good idea (100 User * 2 min = 200 min [Normalcase?]) are 200 min wasted time, a better idea is changing _Excel_RangeRead to returning also the displayed value whe