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python datetime 时区(timezone) dateutil

from datetime import datetime

from dateutil import tz, zoneinfo

if __name__ == '__main__':
    zonefile = zoneinfo.get_zonefile_instance()
    print zonefile.zones.keys()[:20]
    # use timezone
    tz_dubai = tz.gettz('Asia/Dubai')
    tz_sh = tz.gettz('Asia/Shanghai')
    # Shanghai timezone
    now_sh = datetime.now(tz=tz_sh)
    print now_sh
    # Dubai timezone
    now_dubai = datetime.now(tz=tz_dubai)
    print now_dubai
    # datetime timezone conversion
    print now_dubai.astimezone(tz_sh)
    print 'done!'

['Atlantic/Canary', 'Europe/Lisbon', 'Etc/GMT+9', 'Etc/GMT+8', 'Antarctica/Mawson', 'Etc/GMT+3', 'Etc/GMT+2', 'Etc/GMT+1', 'Etc/GMT+0', 'Etc/GMT+7', 'Etc/GMT+6', 'Etc/GMT+5', 'Etc/GMT+4', 'Indian/Reunion', 'America/Fort_Nelson', 'Antarctica/Davis', 'America/Coral_Harbour', 'Asia/Dhaka', 'America/St_Lucia', 'Australia/LHI']
2019-01-16 21:15:41.503000+08:00
2019-01-16 17:15:41.503000+04:00
2019-01-16 21:15:41.503000+08:00
done