from django.db import models
from timezone_field.fields import TimeZoneField

class MyModel(models.Model):
    timezone = TimeZoneField()

# valid assignment values include:
#   * any string that validates against pytz.all_timezones
#   * any instance of pytz.tzinfo.DstTzInfo or pytz.tzinfo.StaticTzInfo
#   * the pytz.UTC singleton
my_inst = MyModel(timezone='America/Los_Angeles')
my_inst.full_clean()

# under the hood, values are stored in the database as strings
my_inst.save()

# values read from the field are either instances of pytz.tzinfo.DstTzinfo
# or pytz.tzinfo.StaticTzInfo, or the pytz.UTC singleton
tz = my_inst.timezone
repr(tz)    # "<DstTzInfo 'America/Los_Angeles' PST-1 day, 16:00:00 STD>"