Code & Data
Build a cron expression
Fill in the five fields, or start from a preset. The expression is described in English and the next six runs are listed, so you can check it does what you meant before it goes anywhere near a server.
At 09:00 on Monday, Tuesday, Wednesday, Thursday and Friday.
Fields
0-59
0-23
1-31
1-12
0-6
Presets
Next runs
- Tue, Sep 22, 2026, 09:00 AM
- Wed, Sep 23, 2026, 09:00 AM
- Thu, Sep 24, 2026, 09:00 AM
- Fri, Sep 25, 2026, 09:00 AM
- Mon, Sep 28, 2026, 09:00 AM
- Tue, Sep 29, 2026, 09:00 AM
Computed in your device’s time zone. A server usually runs cron in UTC, so check which zone yours uses before relying on the hour.
- Runs in your browser
- No account required
- Free to use
How it works
Five fields, in order
Minute, hour, day of month, month, day of week. Each accepts a number, a list, a range, a step, or a wildcard — and month and weekday accept names.
Verified by prediction
The next runs are computed by walking forward minute by minute and testing each one, which is slow and obviously correct. A prediction that agrees with what you intended is far better evidence than a description alone.
The day-field trap
When both day of month and day of week are set, cron runs when EITHER matches, not both. `0 0 1 * 1` is the first of the month AND every Monday — not only a Monday that falls on the first. That is stated in the description, because it silently turns a monthly job into a weekly one.
What it does
Presets for the common schedules
Hourly, daily, weekdays, weekly and monthly, as starting points.
English description
Generated from the parsed fields rather than pattern-matched, so it is right for unusual expressions too.
The next six runs
Dated and timed, in your zone.
Runs in your browser
No account and no upload — what you type is never sent anywhere. Analytics records that the tool was opened, never what you put into it.
Practical advice
Getting a better result
- Servers usually run cron in UTC. The next runs here are in your zone, so check which yours uses before relying on the hour.
- Steps work from the start of the range: */15 in the minute field is 0, 15, 30 and 45.
- Standard cron has five fields. Six-field expressions include seconds and are a Quartz or Spring extension, not standard cron.
Questions
Things people ask
What do the five fields mean?
Minute (0-59), hour (0-23), day of month (1-31), month (1-12), day of week (0-6, where 0 is Sunday). A wildcard means every value.
How do I run something every 15 minutes?
*/15 in the minute field, wildcards elsewhere — `*/15 * * * *`. The step counts from the start of the range, so it fires at 0, 15, 30 and 45 past every hour.
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