Scheduled tasks
From MoodleDocs
Scheduled tasks
An administrator can schedule routine tasks very precisely from Administration>Site administration>Server>Scheduled tasks.
Clicking the edit icon allows the administrator to specify the minute/hour/day/month or day of the week the task is to be run. It is also possible to reset the task to its default setting or disable it completely.
Format for scheduling tasks
When typing into the fields, the format is the same as for Unix cron. Examples are as follows and are according to which field you are editing:
* is every minute, hour, day, month */2 is every two minutes, every two hours or every second day *2-10 is every minute between two and ten past the hour or every hour between 2 and 10 am *0 is every Sunday *1 is every Monday or every January *2,5 is the second and 5th of the month, or February and May, or Tuesday and Friday.