@BastilleBSD metacpan.org/pod/DateTime::Eve (or similar) and then use that to generate oneshot cronjobs drop-in files w/a prefix of your choosing (for easy cleanup) in /etc/cron.d/, that fire off a command at the precise time per day based on timestamps from this? Cron runs every minute IIRC.Each week, clean up the old oneshot job file and generate next week's job file.Make sure to schedule the cleanup + regeneration task after the last sunset, but also before any summer/normal time changes.