Gets the timestamp at which the scheduler should plan to execute a job with this schedule next.
Marks the schedule as having been executed at the given time.
Tells whether the schedule is repeating; that jobs with this schedule should be re-queued after being executed.
The Cron schedule makes use of a CRON-style expression string to define the times at which jobs will be run. Note that Cron expressions have no concept of time zones, so all times are interpreted as in the local time zone.
For more information on the specific format, please see https://github.com/Kegian/cron