Gives a crontab expression, source and target timezones, return a new crontab expression that times change according to the given timezones.
pip3 install crontzconvert
convert(cron_expression, source_timezone, target_timezone)
>> from crontzconvert import convert
>> convert('* 0/12 * * *', 'Asia/Shanghai', 'UTC') # UTC+8 to UTC
'* 16/12 * * *'
Change day and week when switch timezone