Explain a cron schedule and see when it runs
Type a cron expression to read it in plain English, list its next runs and see the week it covers.
- Runs on your device
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- Works offline after a visit
Nothing is sent anywhere. The schedule is worked out in this tab.
| Field | Written | Means |
|---|
Next 10 runs
| # | When | From now |
|---|
The coming week
How to read a cron expression and see its next runs
- Type the expression, or pick a common schedule.
- Choose the time zone the job runs in.
- Read the sentence, the next runs and the warnings.
Questions
Which cron formats does it read?
Five fields (minute, hour, day of month, month, day of week), six fields with seconds in front, and the @daily style macros. It also reads the Quartz L, W and # forms, such as 0 0 L * * for the last day of each month.
Why do the day and the weekday both match some days?
In standard cron, when both day fields are set, a day runs if either one matches. So 0 0 13 * 5 runs on the 13th and on every Friday. A * or ? in one of the two fields lets the other field decide alone.
Why are some times missing on clock-change days?
When clocks jump forward, a time such as 02:30 never happens, so that run is skipped. When clocks go back, a time that happens twice runs once, at its first occurrence. Choose the zone the job really uses.
Is my schedule sent anywhere?
No. The expression is read and the runs are worked out in your browser, using the time zones your browser knows.
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