def to_utc_datetime(self, value):
        """
        from value to datetime with tzinfo format (datetime.datetime instance)
        """
        if isinstance(value, (six.integer_types, float, six.string_types)):
            value = self.to_naive_datetime(value)

        if isinstance(value, datetime.datetime):
            if timezone.is_naive(value):
                value = timezone.make_aware(value, timezone.utc)
            else:
                value = timezone.localtime(value, timezone.utc)
            return value

        raise exceptions.ValidationError(
            "Unable to convert value: '%s' to python data type" % value,
            code="invalid_datetime"
        )