parser.py 文件源码

def parse(cls, string):

        tzinfo = None

        if string == 'local':
            tzinfo = tz.tzlocal()

        elif string in ['utc', 'UTC']:
            tzinfo = tz.tzutc()

        else:

            iso_match = cls._TZINFO_RE.match(string)

            if iso_match:
                sign, hours, minutes = iso_match.groups()
                seconds = int(hours) * 3600 + int(minutes) * 60

                if sign == '-':
                    seconds *= -1

                tzinfo = tz.tzoffset(None, seconds)

            else:
                tzinfo = tz.gettz(string)

        if tzinfo is None:
            raise ParserError('Could not parse timezone expression "{0}"', string)

        return tzinfo