[Python-Dev] Status on PEP-431 Timezones

[Tres Seaver]

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On 07/27/2015 02:04 AM, Tim Peters wrote:
> The naive arithmetic within a timezone is already correct, by its own 
> internal criteria.  It's also useful (see the original discussions,
> or Paul Moore's recent brief account).

"Naive" alarm clocks (those which don't know from timezones) break human
expectations twice a year, because their users have to be awake to fix
them (or make the clock itself out-of-whack with real civil time for the
hours between fixing and the actual transition). For confirmatoin, ask
your local priest / pastor about the twice yearly mixups among
congregants whose clocks don't self-adjust for the DST boundary:  some
show up late / early for church *every* time the local zone changes.

I'd be in favor of dropping "days" from timedelta, myself, for just this
reason:  if "1 day" is the same for your usecase as "24 hours", then just
do the math yourself.


Tres.
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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