By default, all interpretation and scheduling is done with your local timezone (
TZ environment variable).
Cron schedule may also override the timezone to be interpreted in by providing an additional space-separated field
at the beginning of the cron spec, of the form
ddns-route53 --schedule "CRON_TZ=Asia/Tokyo */30 * * * *"
Created: 2020-11-15 21:13:30