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datetime_to_fakedatetime function ignores fold parameter #422

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alexander-doroshenko opened this issue Oct 31, 2021 · 1 comment · May be fixed by #424
Open

datetime_to_fakedatetime function ignores fold parameter #422

alexander-doroshenko opened this issue Oct 31, 2021 · 1 comment · May be fixed by #424

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@alexander-doroshenko
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alexander-doroshenko commented Oct 31, 2021 •
edited

since python 3.6 version to datetime class was added fold argument to disambiguate the times during a repeated interval.

An example of where it can hurt :

from datetime import timezone, datetime
from freezegun import api

d = datetime(2021, 10, 30, 23, tzinfo=timezone.utc)
fd = api.FakeDatetime(2021, 10, 30, 23, tzinfo=timezone.utc)
isr = tz.gettz('Israel')
d.astimezone(isr).dst() == fd.astimezone(isr).dst()
>> False
@emontnemery emontnemery linked a pull request Nov 2, 2021 that will close this issue
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@couling
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couling commented Sep 26, 2023

In real terms this is particularly frustrating because we can't test TZ changes in our code. This is one of the big use cases for us.

>>> from datetime import datetime
>>> from zoneinfo import ZoneInfo
>>>
>>> from freezegun import freeze_time
>>>
>>> UTC = ZoneInfo("UTC")
>>> UK = ZoneInfo("Europe/London")
>>>
>>> before_change = datetime(2023, 10, 29, 0, 30, tzinfo=UTC)
>>> with freeze_time(before_change):
...     print(before_change.astimezone(UK))
...     print(datetime.now(UTC).astimezone(UK))
...
2023-10-29 01:30:00+01:00
2023-10-29 01:30:00+01:00
>>> after_change = datetime(2023, 10, 29, 1, 30, tzinfo=UTC)
>>> with freeze_time(after_change):
...     print(after_change.astimezone(UK))
...     print(datetime.now(UTC).astimezone(UK))
...
2023-10-29 01:30:00+00:00
2023-10-29 01:30:00+01:00

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Add basic fold support emontnemery/freezegun
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@alexander-doroshenko @couling