Python 不安裝額外套件轉換時區

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目標

將符合 ISO 8601 格式的 1987-09-12T09:12:00+08:00 字串轉換成 UTC 時區的 datetime.datetime 物件。

步驟

Python 3

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from datetime import datetime, timezone
def main():
    dt_format = '%Y-%m-%dT%H:%M:%S%z'
    dt_str = '1987-09-12T09:12:00+08:00'
    dt = datetime.strptime(dt_str.replace('+08:00', '+0800'), dt_format)
    utc_dt = dt.astimezone(timezone.utc)
    print(dt)  # 1987-09-12 09:12:00+08:00
    print(utc_dt)  # 1987-09-12 01:12:00+00:00
if __name__ == '__main__':
    main()

Python 2

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from datetime import datetime, timedelta, tzinfo
class UTC(tzinfo):
    def utcoffset(self, dt):
        return timedelta(0)
    def tzname(self, dt):
        return 'UTC'
    def dst(self, dt):
        return timedelta(0)
class GMT8(tzinfo):
    def dst(self, dt):
        return timedelta(0)
    def tzname(self, dt):
        return 'GMT +8'
    def utcoffset(self, dt):
        return timedelta(hours=8) + self.dst(dt)
def main():
    dt_format = '%Y-%m-%dT%H:%M:%S'
    dt_str = '1987-09-12T09:12:00+08:00'
    naive_dt = datetime.strptime(dt_str.replace('+08:00', ''), dt_format)
    dt = naive_dt.replace(tzinfo=GMT8())
    utc_dt = dt.astimezone(UTC())
    print(dt)  # 1987-09-12 09:12:00+08:00
    print(utc_dt)  # 1987-09-12 01:12:00+00:00
if __name__ == '__main__':
    main()