[Datetime-SIG] PEP-495 - Strict Invalid Time Checking

Carl Meyer carl at oddbird.net
Tue Aug 25 22:30:32 CEST 2015

On 08/25/2015 02:24 PM, Alexander Belopolsky wrote:
> On Tue, Aug 25, 2015 at 4:13 PM, Carl Meyer <carl at oddbird.net
> <mailto:carl at oddbird.net>> wrote:
>     You are missing the crux of my use case, which is that I need to
>     generate a calendar to display to the user, with all the half-hour slots
>     from midnight to midnight for one day in it
> Got it.  How is this then
> start = datetime.combine(date, time(0)).astimezone()
> while True:
>     end = (start + timedelta(hours=0.5)).astimezone()
>     print(start, end)
>     start = end
>     if end.time() == time(0):
>         break

On DST transition days, this code does not generate exactly 48 slots,
displayable to the user in a schedule that includes all hours from 0 to
23 labeled exactly once.

That introduces an unacceptable level of additional display-layer
complexity, and remains inferior to the "strict checking" solution I chose.


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