Scheduler recurrence patterns
You can set up a schedule to run repeatedly by configuring a recurrence pattern. Any recurrence pattern you set begins after the start time you specify.
You have several recurrence pattern options.
Pre-defined - A set of common recurrence patterns from which you can select
Cron expression - A string composed of 6 or 7 fields separated by white space that represents a set of times
Simple custom recurrence pattern - A user interface for creating recurring patterns that is similar to many common meeting schedulers
All of the scheduler recurrence patterns are based on cron expressions. The scheduler provides pre-defined patterns in the user interface for easier creation of these cron expressions. If you write your own custom cron expression, it is a good practice to provide a meaningful description of the recurrence pattern, to make it easier for anyone who is not fluent in reading these expressions to understand the pattern.
All of the recurrence patterns reset at the end of the next longer interval. For example, if you set a custom weekly pattern to run every three weeks, it runs the third week of every month, because the pattern resets at the end of every month. This is a characteristic of all cron expressions. To set a schedule that actually runs on week 3, 6, 9, 12, and so on, you must create separate schedules for each desired execution date.
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