Cron Explainer

A cron expression is five fields — minute, hour, day-of-month, month and day-of-week — that define a repeating schedule, used by Unix cron and many schedulers.

It translates the expression into plain English and lists the next few times it will run, so you can confirm a schedule does what you intended.

An asterisk (*) means "every", a slash (*/5) means "every 5", a dash (1-5) is a range, and a comma (1,15) is a list. This tool understands all of them.