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astimezone template tag

Author:
whardier
Posted:
March 9, 2011
Language:
Python
Version:
1.2
Tags:
templatetag datetime timezone pytz
Score:
2 (after 2 ratings)

should probably be migrated to an inclusion tag to allow a source timezone that isn't the site specific TIME_ZONE.

This code assumes that your database stores dates according to the django.conf.settings.TIME_ZONE variable.

Yes.. this assumes that dates are stored in the database according to system time. On my systems the system time of a server is always UTC therefore avoiding problems with datetime (no tz info) columns in backend databases having no timezone information and stored according to the database or system timezone information. I find it a good practice to always use UTC for any stored information and always retrieve information as UTC and localize the date during display.

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from django import template
from django.conf import settings

import pytz

register = template.Library()

@register.filter
def astimezone(date, destination=None):

    if not destination:
        destination = settings.TIME_ZONE

    if date.tzinfo:
        return date.astimezone(pytz.timezone(destination))
    else:
        return pytz.timezone(settings.TIME_ZONE).localize(date).astimezone(pytz.timezone(destination))

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