Weekofyear is wrong for germany

Targets Windows
1

the weekofyear seems wrong for germany, can somebody agree?
at least at this one printed which hang at office wall show 17. and my calendar at home too.

Var d As New DateTime(2021,4,26,0,0,0,0) ' 26.04.2021
MessageBox "WeekOfYear = " + d.WeekOfYear.ToString + " (should be 17 not 18)"

Xojo 2021r1.1

Germany see Middle East, the international ISO 8601 standard

IMG_20210519_193532_862
IMG_20210519_193532_8622255×497 196 KB

Web

IMG_20210519_193343_657
IMG_20210519_193343_6572901×1062 1.42 MB

Wiki

Die Kalenderwoche ist nach ISO 8601 so definiert: Kalenderwochen haben 7 Tage, beginnen an einem Montag und werden über das Jahr fortlaufend nummeriert. Die Kalenderwoche 1 eines Jahres ist diejenige, die den ersten Donnerstag enthält.

2

Cases:
11024 - WeekOfYear not international savvy
63292 - Weekofyear incorrectly calculated for 2021

1 Like
3

great … 11 years or
5 months later and nothing happened

4

Yes, hard to understand.
There’s certainly a workaround by adding 1 if the day is Sunday, and finding which day number is the first Thursday, but I don’t see the point of having functions that won’t work outside of the USA (and that aren’t fixed 10 years later; I won’t believe each supported OS today doesn’t support internationalised dates out of the box)…