On 08.06.2021 7:34, Russell VT wrote:
What version(s) of the timezone files are installed on each?
Cygwin:

$ cygcheck -c | grep tz
tzcode 2021a-1                         OK
tzdata 2021a-1                         OK
Windows:

I didn't find a TZ-specific update KB in the list of installed updates. However, I did check that there is a "(UTC+2:00) Juba" timezone in the Windows selector, as described in [1], which means that the respective TZ update (also described in KB4601275) is present on system.
Also, seems one of the Python versions came from Windows, rather than 
Cygwin?
Heh, I hoped that when I titled the original mail as "Python *for 
Windows* reports ... under Cygwin ...", and repeatedly mentioned that in 
the body, it's obvious that indeed, the problem is exactly running 
native Windows build of Python under cygwin:
    But running Python *for Windows* (it doesn't matter which,
    specifically
    for the test I used the one *from MS Store* [1]), I have incorrect
    local time:
    ...
    Starting the same Python *for Windows* from cmd.exe has it correct:
    ...
    This is a problem, because in our project (LibreOffice), we use
    Cygwin
    as environment for unit testing, where LibreOffice's own Python (also
    *built natively for Windows*) is used, and at some times ...

[1] 
https://techcommunity.microsoft.com/t5/daylight-saving-time-time-zone/2021-time-zone-updates-for-republic-of-south-sudan-now-available/ba-p/2234981

--

Best regards,

Mike Kaganski


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