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Cron Next Run Calculator

See the next fire times for a cron expression, with each field explained.

A cron expression has five fields — minute, hour, day of month, month and weekday — and this calculator expands them to show exactly when a job next runs. It handles ranges, steps, lists, month and day names, @daily shortcuts, and the rule that day-of-month and day-of-week combine with OR rather than AND.

Runs in your browser
Supports
Ranges, steps, lists, names, six-field second precision and @daily shortcuts
Handles the OR rule
Day-of-month and day-of-week are ORed when both are restricted
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why does my job run more often than expected?

Almost always the day-of-month and day-of-week OR rule. If both fields are restricted, cron fires when either matches — so "0 0 13 * FRI" runs on the 13th of every month and on every Friday, not only on Friday the 13th.

What does */15 mean?

Every 15 units counting from the lowest value in the range. In the minute field that gives :00, :15, :30 and :45 — it is a step, not "every 15 minutes from now".

How to use the cron next run calculator

  1. 1Enter or paste your cron expression.
  2. 2Set the show next.
  3. 3Enter or paste your starting from.
  4. 4Turn "Six fields (seconds first)" on or off as needed.
  5. 5The result appears immediately — copy or download it.

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