timezone("CET") returns wrong offset

[pmikh]

Hi, I've encountered the following bug in the latest version of the pytz.

version: pytz==2024.2

steps to reproduce:

offset = pytz.timezone("CET")
print(offset)

output:

The offset is +18 minutes instead of expected +1.

[andy-maier]

We also see the same issue in pytz 2025.1 and 2025.2.
Circumvention for us is to exclude the pytz versions that have the issue: 2024.2, 2025.1, 2025.2

Can anyone please have a look at this?

[CarliJoy]

If you think a timezone definition is incorrect, I probably can’t fix it. pytz is a direct translation of the Olson timezone database, and changes to the timezone definitions need to be made to this source. If you find errors they should be reported to the time zone mailing list, linked from http://www.iana.org/time-zones.

from https://pythonhosted.org/pytz/

Guess here is the wrong place to ask about a fix?

[bronger]

https://stackoverflow.com/a/68451031 suggests that the LMT thing means that you cannot use pytz in some contexts, e.g. using it in .replace(tzinfo=….