Cron is a scheduling format that provides a simple way for users to set repeating scheduled events using only five values (hour, minute, day, month, weekday). Cron is used in Ignition's Report module to schedule report generation and it's used in Gateway auto-backups. A Crontab is a file which contains the schedule of Cron entries to be run and at specified times. In Ignition, the CronTab files are managed for you.
30 1 * * * # Every day at 1:30 AM
0 0 * * 0 # Every Sunday at midnight