Python for Windows reports wrong local time when run under Cygwin on Europe/Moscow TZ

[Russell VT]

What version(s) of the timezone files are installed on each?

Also, seems one of the Python versions came from Windows, rather than
Cygwin?



On Mon, Jun 7, 2021 at 12:01 AM Mike Kaganski via Cygwin <cygwin@cygwin.com>
wrote:

> Hello,
>
> Running Cygwin 3.1.7-1 on Windows 10 Version 21H1 (OS Build 19043.985),
> I have this issue:
>
> when I start Cygwin's Python, I have correct time reported:
>
> > mikek@DESKTOP-8SHAE9Q ~
> > $ python
> > Python 3.8.9 (default, Apr 21 2021, 23:14:29)
> > [GCC 10.2.0] on cygwin
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> import datetime
> > >>> datetime.datetime.now()
> > datetime.datetime(2021, 6, 7, 9, 40, 15, 318391)
>
> 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:
>
> > mikek@DESKTOP-8SHAE9Q ~
> > $ "C:/Program
> >
> Files/WindowsApps/PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0/python3.8.exe"
> > Python 3.8.10 (tags/v3.8.10:3d8993a, May  3 2021, 11:48:03) [MSC
> > v.1928 64 bit (AMD64)] on win32
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> import datetime
> > >>> datetime.datetime.now()
> > datetime.datetime(2021, 6, 7, 7, 40, 55, 503775)
>
> Note how the latter output reports 2021-06-07 07:40, while the former
> reports 2021-06-07 09:40. The difference is 2 hours.
>
> Starting the same Python for Windows from cmd.exe has it correct:
>
> > C:\Users\mikek>python
> > Python 3.8.10 (tags/v3.8.10:3d8993a, May  3 2021, 11:48:03) [MSC
> > v.1928 64 bit (AMD64)] on win32
> > Type "help", "copyright", "credits" or "license" for more information.
> > >>> import datetime
> > >>> datetime.datetime.now()
> > datetime.datetime(2021, 6, 7, 9, 41, 21, 925240)
>
> Cygwin reports correct timezone:
>
> > $ echo $TZ
> > Europe/Moscow
>
> Starting Python for Windows using a different timezone (specifically, '$
> TZ=UTC "C:/Program
> Files/WindowsApps/PythonSoftwareFoundation.Python.3.8_3.8.2800.0_x64__qbz5n2kfra8p0/python3.8.exe"')
>
> gives correct time for *that* time zone.
>
> 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 (from 00:00 till
> 02:00) it reports wrong dates, which makes tests fail locally on
> affected systems(see [2]).
>
> Thank you!
>
>
> [1] https://www.microsoft.com/en-us/p/python-38/9mssztt1n39l
>
> [2]
>
> https://gerrit.libreoffice.org/c/core/+/92217/2#message-f55091795e7cde9d75adc00ddb69451121b644f6
>
>
> --
>
> Best regards,
>
> Mike Kaganski
>
>
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-- 
Russell M. Van Tassell <russellvt@gmail.com>