[Python-Dev] Status on PEP-431 Timezones

[Isaac Schwabacher]

On 15-04-15, Akira Li <4kir4.1i at gmail.com> wrote:
> Isaac Schwabacher <ischwabacher at wisc.edu> writes:
> > ...
> >
> > I know that you can do datetime.now(tz), and you can do datetime(2013,
> > 11, 3, 1, 30, tzinfo=zoneinfo('America/Chicago')), but not being able
> > to add a time zone to an existing naive datetime is painful (and
> > strptime doesn't even let you pass in a time zone). 
> 
> `.now(tz)` is correct. `datetime(..., tzinfo=tz)`) is wrong: if tz is a
> pytz timezone then you may get a wrong tzinfo (LMT), you should use
> `tz.localize(naive_dt, is_dst=False|True|None)` instead.

The whole point of this thread is to finalize PEP 431, which fixes the problem for which `localize()` and `normalize()` are workarounds. When this is done, `datetime(..., tzinfo=tz)` will be correct.

ijs