Cron

Cron Next Run

Find the next cron occurrence after an explicit reference instant in a required IANA timezone and show the elapsed time until it.

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Cron Next Run input

Cron expression

Five fields: minute hour day-of-month month day-of-week. Six fields add seconds first. Bounds: seconds/minutes 0–59, hours 0–23, day-of-month 1–31, months 1–12 (JAN–DEC), weekdays 0–7 (MON–SUN; 0 and 7 are Sunday).

Reference date/time

The picker edits UTC. You can manually enter an ISO date/time in 1970–2099 with an explicit Z or ±HH:mm offset. Date-only and offset-free values are not accepted. Current date and time uses a fresh snapshot of your device clock only when clicked.

Timezone

Required: search or enter an IANA timezone, such as Asia/Kolkata, America/New_York or UTC. Cron fields match the wall clock in this zone.

Five-field Unix cron or an explicit six-field seconds-first extension. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'. Month names JAN–DEC and weekday names MON–SUN are supported.

Unix day rules: if either day field begins with '*', both day fields must match. Otherwise day-of-month and day-of-week use OR: a match on either is sufficient.

The next run is strictly after the supplied reference. Timezone rules come from your browser’s IANA database; supported reference years are 1970–2099. Search is limited to eight years and ends in 2099. Skipped wall times do not run; repeated wall times can run at either matching instant. Historical offsets containing seconds cannot be represented in this output and produce an error.

Cron Next Run results

Your result will appear here after you calculate next run. Editing an input clears the previous result.

Processed locally in your browser. Inputs and results are not uploaded or saved by this page.

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What does this tool do?

Find the next cron occurrence after an explicit reference instant in a required IANA timezone and show the elapsed time until it. Inputs: Cron expression, Reference date/time, Timezone. Outputs: Next run date/time, Time until next run.

How to use it?

Enter the expression, the reference instant with its UTC offset and the schedule’s IANA timezone. The picker edits UTC; manual ISO values with an explicit offset are allowed. No reference time or timezone is filled automatically. Click “Current date and time” to fill only the reference with a fresh device-clock snapshot in UTC; it does not refresh automatically. Choose “Calculate next run”, then copy individual result values. Clear restores the initial field defaults and removes results and messages.

Supported syntax: five-field Unix cron or the explicitly entered six-field seconds-first extension. Not a Quartz, Jenkins, AWS EventBridge or Kubernetes configuration converter. Parsing and calculation never execute jobs. Human descriptions use only the listed deterministic phrases. Next Run is bounded to eight years within 1970–2099 and uses the browser’s IANA data, skipping missing wall times and considering both repeated instants.