Cron Expression Calculator

This calculator uses Unix-style five-field cron: minute, hour, day of month, month, and day of week. For example, 0 9 * * 1-5 runs at 9:00 AM Monday through Friday. Not every scheduler uses this format. AWS EventBridge uses a six-field expression that includes year, while Quartz adds seconds and can include year. Check your scheduler's syntax before using an expression.

A slash applies a step to the values described before it. In the minute field, */15 walks the full 0-59 range and selects 0, 15, 30, and 45. The expression 0-30/5 selects every fifth minute from 0 through 30. This calculator also treats 5/15 as a start-and-step form, selecting 5, 20, 35, and 50. Step values must be positive integers.

Yes. This calculator accepts JAN-DEC in the month field and SUN-SAT in the day-of-week field, without regard to case. You can use names as values, range endpoints, or step bases. For example, MON-FRI selects weekdays and MON/2 selects Monday, Wednesday, and Friday. Other schedulers may support a smaller syntax, so check the target engine.

This calculator follows Vixie-style cron, where restricted day-of-month and day-of-week fields use OR. Thus 0 0 1 * 0 runs on every first day of the month and every Sunday. Other schedulers use different syntax and day rules. Quartz, for example, normally requires one of those fields to use ?. Check the engine you target.

Historical compatibility. The original AT&T cron used 0-6 with Sunday as 0, while later Vixie cron added 7 as an alias for Sunday so users coming from systems that index weekdays 1-7 (with Sunday at 7) would not be surprised. Internally both values resolve to the same day, so 0 0 * * 0, 0 0 * * 7, and 0 0 * * SUN are identical schedules. The calculator collapses 7 to 0 in its output so you do not see both numbers in the matches list.