Parse expression · preview next runs

When to use it

Sanity-checking the 0 9 * * 1-5 in a GitHub Actions schedule, a Kubernetes CronJob, Airflow, or system crontab — before the thing actually runs at the wrong time.

How it works

Enter the expression at the top. A plain-English description appears, followed by a list of upcoming runs in your local time zone. The preset buttons below load common expressions.

Field rules

Five fields, in order: minute hour day-of-month month day-of-week.

• * — every value
• A-B — range (9-17)
• */N or A-B/N — step (*/15, 9-17/2)
• a,b,c — list (0,15,30,45)
• Months accept JAN..DEC, weekdays accept SUN..SAT

If both day-of-month and day-of-week are specific (not *), they match with OR — the traditional crontab rule. So 0 0 1 * 1 fires on the 1st of every month or every Monday.

Limitations

Standard five-field cron only. Quartz/extension syntax (@reboot, seconds as a sixth field, L, W, #n) is not supported.