python - Django DST Time change issue with django datetimefield -



python - Django DST Time change issue with django datetimefield -

i facing problem in django app while working datetimefield.its because of dst time changes.

i have created event on 30-oct-2015(dst lastly week). created re-create of first event on 06-nov-2015(non dst day)

i applied timedelta of 7 days , chaned days 7+. did not aplly timedelta hours.

due day lite saving , reduced one hour. dont need this. want have same hours. how can that.?

i tried , did not help me.

dst timezone issue in django app

please see screenshot

my models.py

from django.db import models datetime import timedelta class event(models.model): name = models.charfield(max_length=100) created = models.datetimefield(auto_now_add=true) start_date = models.datetimefield() def __unicode__(self): homecoming self.name def copy_event(self, add_days=timedelta(days=7)): start_date = self.start_date + add_days name = self.name +' (copy)' new_event = event(name = name,created = self.created,start_date=start_date,) new_event.save() homecoming new_event

since use_tz=true dealing aware datetimes, represent precise moment in time. moment in time will, in general, displayed differently depending on current time zone. time zones have dst , don't, in general there's no way can store datetime such users in timezones see clock time want (i.e. same clock time event beingness copied).

i can think of couple workarounds:

if it's case you're serving 1 time zone (that is, current time zone going same), can arithmetic in time zone.

from django.utils.timezone import localtime new_start_date = localtime(self.start_date) + add_days

the add-on of add_days maintain clock time same (that is, doesn't take dst account). new_start_date converted , stored in utc, , converted desired local time display.

what you're trying represent particular clock time on particular day, not exact moment in time. perhaps don't want using aware datetimes @ all. 1 alternative set use_tz=false, that's global, far-reaching alter may not want make. alternative utilize different representation field. example, utilize datefield , timefield instead of datetimefield.

python django dst

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