Cron Parser
Parse a cron expression field by field and compute the next 5 run times.
FAQ
What is the order of the 5 cron fields?
Minute (0-59), hour (0-23), day of month (1-31), month (1-12), day of week (0-6, 0=Sunday). '0 9 * * 1-5' means 9 AM on weekdays.
What if both day-of-month and day-of-week are set?
Per standard cron semantics they combine with OR: '0 0 1 * 1' runs on the 1st of each month and every Monday.
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