Cron expression explainer
Paste a 5-field cron expression. We explain it in plain English and show the next 6 fire times in UTC. Catches the day-of-week OR day-of-month quirk most builders trip on.
Cron expression
Explanation
Validat minute 0, hour 9, every day-of-month, every month, on MON, TUE, WED, THU, FRI (UTC).
Minute
0
Hour
9
Day-of-month
1, 2, 3, 4, 5… (31 total)
Month
Jan, Feb, Mar, Apr, May… (12 total)
Day-of-week
Mon, Tue, Wed, Thu, Fri
Next 6 fire times
- #1 2026-06-01 (Mon) 09:00 UTC
- #2 2026-06-02 (Tue) 09:00 UTC
- #3 2026-06-03 (Wed) 09:00 UTC
- #4 2026-06-04 (Thu) 09:00 UTC
- #5 2026-06-05 (Fri) 09:00 UTC
- #6 2026-06-08 (Mon) 09:00 UTC
The famous gotcha: when both day-of-month and day-of-week are restricted (neither is *), cron fires when either matches, not both. So 0 0 1 * 0 fires on the 1st of every month ORevery Sunday — not just on the 1st when it's a Sunday. We've seen this break a lot of backup schedules. All times are UTC.