Step values

Specify step values using the/n suffix with any number. For example, the string 8-18/2 in Hours means "every two hours from 8 AM to 6 PM."

The specification of days can be made in two fields: Days of Month and Days of Week. If both are specified in an entry, then they are cumulative. For example, 0 0 0 1,15 * 1 specifies that a task will run at midnight on the first and fifteenth of every month, and every Monday.

The year is not specified. The current year is assumed unless the time of the next event is in the past. When this happens, the second, minute, hour, day-of-month, or year is incremented to the next recurrence that is in the future.

Note:  These entries are recurring events. There is no provision to specify a single event happening only once.