code: def enforce_timezone(self, value):
          
          field_timezone = getattr(self, 'timezone', self.default_timezone())
  
          if (field_timezone is not None) and not timezone.is_aware(value):
              return timezone.make_aware(value, field_timezone)
          elif (field_timezone is None) and timezone.is_aware(value):
              return timezone.make_naive(value, timezone.UTC())
          return value
docs: When `self.default_timezone` is `None`, always return naive datetimes.
          When `self.default_timezone` is not `None`, always return aware datetimes.