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time.localtime returns unexpected values #204

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azmeuk opened this issue Aug 30, 2017 · 1 comment · May be fixed by #526
Open

time.localtime returns unexpected values #204

azmeuk opened this issue Aug 30, 2017 · 1 comment · May be fixed by #526
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@azmeuk
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azmeuk commented Aug 30, 2017 •
edited

Freezegun mocked time.localtime seems to depend on the environment timezone.

# localtime.py
import freezegun, time
with freezegun.freeze_time("1970-07-01 00:00:01"):
    print(time.localtime())
$ env TZ=CET python localtime.py
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=1, tm_min=0, tm_sec=1, tm_wday=3, tm_yday=1, tm_isdst=-1)

$ env TZ=UTC python localtime.py
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=1, tm_wday=3, tm_yday=1, tm_isdst=-1)

$ env TZ=CET faketime "1970-01-01 00:00:01" python -c "import time; print(time.localtime())"
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=1, tm_wday=3, tm_yday=1, tm_isdst=0)

$ env TZ=UTC faketime "1970-01-01 00:00:01" python -c "import time; print(time.localtime())"
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=1, tm_wday=3, tm_yday=1, tm_isdst=0)

In CET it produces tm_hour=1 but I think it should be tm_hour=0 like it is in UTC. I believe that freezegun takes the environment timezone into account when mocking localtime, when I would expect it to consider a default UTC timezone.

I also noticed that libfaketime produce a tm_isdst=0 when Freezegun produce tm_isdst=-1 but I am not sure what I am thinking about that.
@spulec spulec added the bug label Mar 6, 2018
@boxed boxed mentioned this issue Sep 29, 2018
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boxed commented Sep 29, 2018 •
edited

The problem is at https://github.com/spulec/freezegun/blob/master/freezegun/api.py#L175

This code explicitly leaks the local time zone offset.

@firesock firesock mentioned this issue May 1, 2020
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@boxed boxed mentioned this issue Feb 21, 2023
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@priezz priezz linked a pull request Dec 19, 2023 that will close this issue
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Fix local timezone and timezone related conversions priezz/freezegun
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@azmeuk @spulec @boxed