forms.py 文件源码

def validate_timezone(form, field):
        """Validate whether the user provided timezone is a valid timezone.
        Lists of valid timezones can be found on `Wikipedia
        <http://en.wikipedia.org/wiki/List_of_tz_database_time_zones>`_
        """
        try:
            timezone(field.data)
        except UnknownTimeZoneError:
            raise ValidationError(_("Please enter a valid timezone."))