localize() fails when offset is too large.

[T J]

I'm playing with custom timezones, some which have an offset that exceeds 24 hours. I am able to convert UTC datetimes into these custom timezones just fine, but using localize() fails.

>>> import datetime

>>> import pytz

>>> dt = pytz.utc.localize(datetime.datetime.utcnow())

>>> dt
datetime.datetime(2015, 8, 31, 23, 30, 55, 590037, tzinfo=<UTC>)

>>> tz = pytz.timezone('Pacific/Auckland_Custom')

>>> dt.astimezone(tz)
datetime.datetime(2015, 9, 2, 4, 30, 55, 590037, tzinfo=<DstTzInfo 'Pacific/Auckland_Custom' NZST+1 day, 5:00:00 STD>)

>>> dt_local = datetime.datetime.now()

>>> tz.localize(dt_local)
.../python2.7/site-packages/pytz/tzinfo.py in localize(self, dt, is_dst)
    314 loc_dt = tzinfo.normalize(dt.replace(tzinfo=tzinfo))
    315 if loc_dt.replace(tzinfo=None) == dt:
--> 316 possible_loc_dt.add(loc_dt)
    317
    318 if len(possible_loc_dt) == 1:

ValueError: tzinfo.utcoffset() returned 1440; must be in -1439 .. 1439

[Stuart Bishop (stub)]

That is coming from Python's datetime library I'm afraid, and there is nothing pytz can do about it. Its documented in the tzinfo specification.