class City(models.Model):
timezone = TimeZoneField(u'timezone')
created = LocalizedDateTimeField(auto_now_add=True, timezone=u'timezone')
class Restaurant(models.Model):
city = models.ForeignKey(City)
created = LocalizedDateTimeField(auto_now_add=True, timezone=u'city__timezone')
class Dish(models.Model):
restaurant = models.ForeignKey(Restaurant)
created = LocalizedDateTimeField(auto_now_add=True, timezone=u'restaurant__city__timezone')