timezones = pytz.all_timezones
print(timezones)
OUTPUT
['Africa/Abidjan', 'Africa/Accra', 'Africa/Addis ... 'Universal', 'W-SU', 'WET', 'Zulu']
TIME_ZONE = "Africa/Abidjan"
print(TIME_ZONE)
OUTPUT
Africa/Abidjan
Here is the list of valid timezones:
http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
You can use
TIME_ZONE = 'Europe/Istanbul'
for UTC+02:00