You are responsible for key management and output validation.
Cron Expression Builder & Next-Run Calculator
Validate five-field cron expressions and preview the next run times in local and UTC time. Everything runs in your browser — no schedules are sent anywhere.
Five Fields
Minute, hour, day of month, month, and day of week (0-6, Sunday to Saturday). Each field supports *, steps like */15, ranges like 9-17, and lists like 1,15.
Next Run Times
| # | Local Time | UTC |
|---|---|---|
| 1 | 8/21/2026, 7:30:00 AM | 2026-08-21 07:30:00 UTC |
| 2 | 8/21/2026, 7:45:00 AM | 2026-08-21 07:45:00 UTC |
| 3 | 8/21/2026, 8:00:00 AM | 2026-08-21 08:00:00 UTC |
| 4 | 8/21/2026, 8:15:00 AM | 2026-08-21 08:15:00 UTC |
| 5 | 8/21/2026, 8:30:00 AM | 2026-08-21 08:30:00 UTC |
Frequently Asked Questions
What do the five cron fields mean?
The standard five-field format is: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-6, where 0 is Sunday). A wildcard * means 'every value' in that position.
Are my schedules uploaded anywhere?
No. The expression is parsed and the next run times are computed entirely in your browser. Nothing is sent to a server or stored.
How do I compute the next run time for a schedule?
The tool walks forward minute by minute and shows the next five matches in both your local time zone and UTC, which is the format most schedulers expect.