[Datetime-SIG] Conversion vs arithmetic (was Re: Is EDT a timezone? Was: PEP-0500)

Guido van Rossum guido at python.org
Tue Aug 25 02:07:31 CEST 2015

Sounds to me like Tim and Stuart disagree on the definition of conversion,

On Mon, Aug 24, 2015 at 5:00 PM, Alexander Belopolsky <
alexander.belopolsky at gmail.com> wrote:

> On Mon, Aug 24, 2015 at 7:55 PM, Carl Meyer <carl at oddbird.net> wrote:
>> But you're changing the subject. That exercise requires far more
>> detailed knowledge of the tzinfo APIs than is required to understand
>> that a single added disambiguating bit is enough to handle timezone
>> conversions, even in the presence of (two-layered) folds and gaps.
> Sorry for that.  Meanwhile, however Tim has responded and the point that
> both of us think is misunderstood is that contrary to Stuart's assertion
> below and at the top of this thread, all conversion issues can be addressed
> without any change to arithmetic.  (Moreover, addressing them with classic
> arithmetic is easier.)
> [Stuart Bishop <stuart at stuartbishop.net>]
> > ...
> > Conversion was the larger issue, and to do that correctly the
> > arithmetic needed to be fixed.
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--Guido van Rossum (python.org/~guido)
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