Class DateTimeField

django/db/models/fields/__init__.py:1599–1737

class DateTimeField(DateField):
    empty_strings_allowed = False
    default_error_messages = {
        "invalid": _(
            "“%(value)s” value has an invalid format. It must be in "
            "YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ] format."
        ),
        "invalid_date": _(
            "“%(value)s” value has the correct format "
            "(YYYY-MM-DD) but it is an invalid date."
        ),
        "invalid_datetime": _(
            "“%(value)s” value has the correct format "
            "(YYYY-MM-DD HH:MM[:ss[.uuuuuu]][TZ]) "
            "but it is an invalid date/time."
        ),
    }
    description = _("Date (with time)")

    # __init__ is inherited from DateField

    def _check_fix_default_value(self):
        """
        Warn that using an actual date or datetime value is probably wrong;
        it's only evaluated on server startup.
        """
        if not self.has_default():
            return []

        value = self.default
        if isinstance(value, (datetime.datetime, datetime.date)):
            return self._check_if_value_fixed(value)
        # No explicit date / datetime value -- no checks necessary.
        return []

    def get_internal_type(self):
        return "DateTimeField"

    def to_python(self, value):
        if value is None:
            return value
        if isinstance(value, datetime.datetime):
            return value
        if isinstance(value, datetime.date):
            value = datetime.datetime(value.year, value.month, value.day)
            if settings.USE_TZ:
                # For backwards compatibility, interpret naive datetimes in
                # local time. This won't work during DST change, but we can't
                # do much about it, so we let the exceptions percolate up the
                # call stack.
                try:
                    name = f"{self.model.__name__}.{self.name}"
                except AttributeError:
                    name = "(unbound)"
                warnings.warn(
                    f"DateTimeField {name} received a naive datetime ({value}) while "
                    "time zone support is active.",
                    RuntimeWarning,