testing/test_git.py::test_git_getdate does not work on systems with non-UTC timezone

[manueljacob]

When running testing/test_git.py::test_git_getdate at 2025-06-12T01:12:59+02:00, the following error happens:

   def test_git_getdate(wd: WorkDir) -> None:
        # TODO: case coverage for git wd parse
        today = datetime.now(timezone.utc).date()
    
        def parse_date() -> date:
            parsed = git.parse(os.fspath(wd.cwd), Configuration())
            assert parsed is not None
            assert parsed.node_date is not None
            return parsed.node_date
    
        git_wd = git.GitWorkdir(wd.cwd)
        assert git_wd.get_head_date() is None
        assert parse_date() == today
    
        wd.commit_testfile()
>       assert git_wd.get_head_date() == today
E       AssertionError: assert datetime.date(2025, 6, 12) == datetime.date(2025, 6, 11)
E        +  where datetime.date(2025, 6, 12) = get_head_date()
E        +    where get_head_date = GitWorkdir(path=PosixPath('/tmp/pytest-of-user/pytest-106/test_git_getdate0/wd')).get_head_date

GitWorkdir.get_head_date() returns the date in the local timezone, while the test compares it to the date in the UTC timezone. The parsed date seems to be used for generating calendar-based versions. I’m not sure what would be the right behavior for that. On one hand, it would be weird if the same project, released at the same (absolute) time in different time zones, would get different versions. On the other hand, it would be a bit surprising if the date in the generated version doesn’t match the date in the local timezone.

[RonnyPfannschmidt]

Not asking git for utc is a bug