Daylight savings time question
Gary Herron
gherron at digipen.edu
Tue Mar 24 18:34:25 EDT 2015
On 03/24/2015 03:24 PM, Dan Stromberg wrote:
> Is there a way of "adding" 4 hours and getting a jump of 5 hours on
> March 8th, 2015 (due to Daylight Savings Time), without hardcoding
> when to spring forward and when to fall back? I'd love it if there's
> some library that'll do this for me.
>
> #!/usr/bin/python
>
> import pytz
> import datetime
>
> def main():
> # On 2015-03-08, 2:00 AM to 2:59AM Pacific time does not exist -
> the clock jumps forward an hour.
> weird_naive_datetime = datetime.datetime(2015, 3, 8, 1, 0,
> 0).replace(tzinfo=pytz.timezone('US/Pacific'))
> weird_tz_aware_datetime =
> weird_naive_datetime.replace(tzinfo=pytz.timezone('US/Pacific'))
> print(weird_tz_aware_datetime)
> four_hours=datetime.timedelta(hours=4)
> print('Four hours later is:')
> print(weird_tz_aware_datetime + four_hours)
> print('...but I want numerically 5 hours later, because of
> Daylight Savings Time')
>
> main()
>
>
> Thanks!
The pyzt module (which you've imported) has lots to say about this. Look
at its procedures "localize' and 'normalize' and all the rest of the
pyzt documentation.
--
Dr. Gary Herron
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418
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