fields.py 文件源码

def to_python(self, value, timezone_in_use):
        if isinstance(value, datetime.datetime):
            return value.astimezone(pytz.utc) if value.tzinfo else value.replace(tzinfo=pytz.utc)
        if isinstance(value, datetime.date):
            return datetime.datetime(value.year, value.month, value.day, tzinfo=pytz.utc)
        if isinstance(value, int):
            return datetime.datetime.utcfromtimestamp(value).replace(tzinfo=pytz.utc)
        if isinstance(value, string_types):
            if value == '0000-00-00 00:00:00':
                return self.class_default
            if len(value) == 10:
                try:
                    value = int(value)
                    return datetime.datetime.utcfromtimestamp(value).replace(tzinfo=pytz.utc)
                except ValueError:
                    pass
            try:
                # left the date naive in case of no tzinfo set
                dt = iso8601.parse_date(value, default_timezone=None)
            except iso8601.ParseError as e:
                raise ValueError(text_type(e))

            # convert naive to aware
            if dt.tzinfo is None or dt.tzinfo.utcoffset(dt) is None:
                dt = timezone_in_use.localize(dt)
            return dt.astimezone(pytz.utc)
        raise ValueError('Invalid value for %s - %r' % (self.__class__.__name__, value))