[Python-Dev] Status on PEP-431 Timezones

Steve Dower Steve.Dower at microsoft.com
Mon Jul 27 16:27:34 CEST 2015

Am I the only one feeling like this entire thread should be moved to python-ideas at this point?

Top-posted from my Windows Phone
From: Steven D'Aprano<mailto:steve at pearwood.info>
Sent: ‎7/‎27/‎2015 7:14
To: python-dev at python.org<mailto:python-dev at python.org>
Subject: Re: [Python-Dev] Status on PEP-431 Timezones

On Mon, Jul 27, 2015 at 10:54:02AM +0200, Lennart Regebro wrote:
> On Mon, Jul 27, 2015 at 10:47 AM, Paul Moore <p.f.moore at gmail.com> wrote:
> > I'm confused by your position. If it's 7am on the clock behind me,
> > right now, then how (under the model proposed by the PEP) do I find
> > the datetime value where it will next be 7am on the clock?
> PEP-431 does not propose to implement calendar operations, and hence
> does not address that question.

To me, Paul's example is a datetime operation: you start with a datetime
(7am today), perform arithmetic on it by adding a period of time (one
day), and get a datetime as the result (7am tomorrow).

To my naive mind, I would have thought of calendar operations to be
things like:

- print a calendar;
- add or remove an appointment;
- send, accept or decline an invitation

What do you think calendar operations are, and how do they differ from
datetime operations? And most importantly, how can we tell them apart?


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