https://bugs.winehq.org/show_bug.cgi?id=47866
--- Comment #1 from Henri Verbeet hverbeet@gmail.com --- (In reply to François Gouget from comment #0)
The comctl32:datetime test fails in the Arabic locale:
datetime.c:212: Test failed: String mismatch ("12 hh" vs "hh 12") datetime.c:796: Test failed: Expected 01/10/2019, got 2019/10/01
https://test.winehq.org/data/tests/comctl32:datetime.html
This failure has been happening for a long time in the fg-win7u64-1spie9-ar VM but now the TestBot has a Windows 10 VM where the issue can be reproduced (w1064v1809_ar).
Since both VMs have different Windows versions and but fail in the same way in the same locale that seems to confirm that Arabic uses a different date format from what is expected.
Probably not the issue here, but as an aside and perhaps despite perceptions, "Arabic" is not a locale any more than e.g. "English" or "French" are, and for things like date and time formats, the distinction between e.g. fr_CA, fr_CH and fr_FR actually matters.