tzinfo.dst() must return a timedelta

Branch: joshfriend/aniso8601:tzinfo-dst-fix

Branch: nielsenb/aniso8601:master

Merged

#7 · Created 2015-05-12 · Last updated 2015-05-12

Merged pull request

Merged in joshfriend/aniso8601/tzinfo-dst-fix (pull request #7)

63929b4·Author: Brandon Nielsen·Closed by: Brandon Nielsen·2015-05-12

Description

The value of None is technically a valid return from tzinfo.dst(), but this doesn't work nicely in the following scenario:

>>> tz = parse_timezone('+04:00')
>>> datetime.now(tz)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: fromutc: non-None dst() result required

Is returning a timedelta with a value of 0 technically the same thing?

tzinfo.dst() must return a timedelta

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