Cron expression builder
Type or paste a cron expression to see what it means and when it runs next, or build one field by field. Times are shown in your time zone or any IANA zone.
At 09:00, Monday through Friday
0–59
0–23
1–31, L, W
1–12, JAN–DEC
0–6, SUN–SAT
Next 10 runs
Calculating run times…
How to use it
- Type an expression, pick a preset, or edit the five fields.
- Read the plain-English description and check the next runs.
- Copy the expression into your crontab, CI config or scheduler.
Details
- Syntax
- 5 fields (minute hour day-of-month month day-of-week), optional 6th leading seconds field
- Supports
- * , - / ranges and steps, JAN–DEC, SUN–SAT, L, W, #, ? and @yearly, @monthly, @weekly, @daily, @hourly
- Time zones
- Your browser's zone, UTC, or any IANA zone such as Europe/Berlin
Questions
What does */15 mean?
Every 15th value of that field, starting from the first. In the minute field, */15 runs at :00, :15, :30 and :45.
If I set both day-of-month and day-of-week, which wins?
Standard cron runs when either matches. 0 9 1 * MON fires on the 1st of the month and on every Monday. This tool follows that rule, so the next-run list shows both.
Does this work for GitHub Actions and Kubernetes CronJobs?
Yes, both use the standard 5-field syntax and evaluate it in UTC. Switch the zone to UTC to see the times they will actually run. AWS EventBridge uses a different 6-field format with a year field.
Is my expression sent anywhere?
No. Parsing and the schedule preview run in the page.