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 : ```python3 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 ```