root/lang/python/gae_django/templatetags/datefilter.py

import pytz
from django.template import resolve_variable, Library
from django.conf import settings

register = Library()

def locale_date(value, arg=None):
    "locale_date"
    from django.utils.dateformat import format
    if not value:
        return ''
    if arg is None:
        arg = settings.DATE_FORMAT
    value = value.replace(tzinfo=pytz.utc).astimezone(pytz.timezone(settings.TIME_ZONE))
    return format(value, arg)
register.filter(locale_date)