pytzを使わずにAsia/Tokyoのタイムゾーンを設定する

環境

• OS: Debian GNU/Linux 9 (stretch)
• python: 3.5.3

参考サイト

• https://qiita.com/mattsu6/items/5511c5631e7a54550f7f
• https://docs.python.jp/3/library/datetime.html

実装(python3系)

tz.py

from datetime import datetime, timezone, timedelta

jp = timezone(timedelta(hours=9), 'Asia/Tokyo')

print(datetime.now(tz=jp).strftime('%Y-%m-%dT%H:%M:%S.%f%z'))
> 2019-01-27T16:36:11.831894+0900

print(datetime.strptime('2019-01-25 19:00:00', '%Y-%m-%d %H:%M:%S').replace(tzinfo=jp).strftime('%Y-%m-%dT%H:%M:%S.%f%z'))
> 2019-01-25T19:00:00.000000+0900

実装(python2系)

timezone/jp.py

from datetime import tzinfo, timedelta

class JP(tzinfo):
    def utcoffset(self, dt):
        return timedelta(hours=9)

    def dst(self, dt):
        return timedelta(0)

    def tzname(self, dt):
        return 'Asia/Tokyo'

利用側

tz.py

from datetime import datetime
from timezone.jp import JP

print(datetime.now(tz=JP()).strftime('%Y-%m-%dT%H:%M:%S.%f%z'))
> 2019-01-27T16:36:11.831894+0900

print(datetime.strptime('2019-01-25 19:00:00', '%Y-%m-%d %H:%M:%S').replace(tzinfo=JP()).strftime('%Y-%m-%dT%H:%M:%S.%f%z'))
> 2019-01-25T19:00:00.000000+0900