def to_db_value(
self, value: Optional[datetime.datetime],
instance: "Union[Type[Model], Model]"
) -> Optional[datetime.datetime]:
# Only do this if it is a Model instance, not class. Test for guaranteed instance var
if hasattr(instance, "_saved_in_db") and (
self.auto_now or
(self.auto_now_add
and getattr(instance, self.model_field_name) is None)):
value = timezone.now()
setattr(instance, self.model_field_name, value)
return value
if value is not None:
if get_use_tz():
if timezone.is_naive(value):
warnings.warn(
"DateTimeField %s received a naive datetime (%s)"
" while time zone support is active." %
(self.model_field_name, value),
RuntimeWarning,
)
value = timezone.make_aware(value, "UTC")
self.validate(value)
return value
def to_python_value(self, value: Any) -> Optional[datetime.datetime]:
if value is None:
return value
if isinstance(value, datetime.datetime):
datetime_value = value
elif isinstance(value, int):
datetime_value = datetime.datetime.fromtimestamp(value)
else:
datetime_value = parse_datetime(value)
if timezone.is_naive(datetime_value):
datetime_value = timezone.make_aware(datetime_value,
get_timezone())
else:
datetime_value = localtime(datetime_value)
return datetime_value