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Thu Sep 24 04:47:11 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-September/141784.html

On 24 Sep 2015 01:21, "Tim Peters" <tim.peters at gmail.com> wrote:

>
> Guido's reply gave a clearer invariant:
>
>     dt.timestamp() ==
>     dt.astimezone(utc).timestamp() ==
>     dt.astimezone(<any other tz>).timestamp()
>
> That's the key point.  If the timestamps are equivalent, then it
> follows that conversions to UTC are equivalent (UTC calendar notation
> is just another way to spell a POSIX timestamp), and so also that
> conversions back from UTC are equivalent.

Thanks for the additional clarifications all, I'm confident I understand
now :)

Might it be worth mentioning Guido's invariant in the section of the PEP
about the timestamp method?

Cheers,
Nick.
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[Python-Dev] PEP 495 accepted