Developer tool

Cron Expression Explainer

Explain cron schedules in plain English with next runs.

Free Runs in your browser

Next 5 run times

Fields

About this tool

Cron Expression Explainer reads a 5-field cron schedule, describes it in plain English and lists the next five times it will run. Use it to check a crontab line or a CI schedule before you deploy it.

How to use Cron Expression Explainer

  1. Type a cron expression or pick a preset.
  2. Read the plain-English description.
  3. Check the next run times in local time or UTC.

Questions people ask

What are the 5 cron fields?

Minute (0-59), hour (0-23), day of month (1-31), month (1-12 or JAN-DEC) and day of week (0-7 or SUN-SAT, where 0 and 7 are both Sunday).

What happens when both day fields are set?

In standard cron, if day of month and day of week are both restricted, the job runs when either one matches, not only when both do.

What does */15 mean?

Every 15 units of that field. */15 in the minute field runs at minutes 0, 15, 30 and 45.

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