Cron expression
A cron expression is a short five-field pattern (minute, hour, day of month, month, day of week) that describes when something repeats; for example 0 9 * * 1-5 means 9am every weekday. ZopNight schedules use one cron per start or stop time, read in the schedule's timezone. Why it matters: A correct pattern in the wrong timezone stops or starts resources at the wrong hour.
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