1 from datetime import timedelta

     2 from pytz import timezone, utc

     3 from django.conf import settings

     4 

     5 local_tz = timezone(settings.TIME_ZONE)

     6 

     7 def request_tz_convert(date, request):

     8     return tz_convert(date, request.session.get('tz',None))

     9 

    10 def tz_convert(date, tz):

    11     """

    12     Convert date to time zone

    13     tz can be;

    14         - '-2' (relative to utc)

    15         - 'Paris/Europe' real timezone like (cf pytz)

    16     """

    17     if tz:

    18         system_local_date = local_tz.localize(date)

    19         try:

    20              # simple utc delta?

    21             utc_offset = int(tz)

    22             utc_time = system_local_date.astimezone(utc)

    23             res = utc.normalize(utc_time + timedelta(hours=utc_offset))

    24             return res

    25         except:

    26             # real timezone

    27             timez = timezone(tz)

    28             local_date = system_local_date.astimezone(timez)

    29             return local_date            

    30     else:

    31         return date