Cron

Cron Expression Generator

Build a cron expression from explicit second, minute, hour, day-of-month, month and weekday fields, with a readable schedule.

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Cron Expression Generator input

Mode: five-field Unix cron

Second (optional)

Optional: leave blank for five-field Unix. Any nonempty value, including '*', selects six fields with seconds first. Bounds: 0–59. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'.

Minute

Bounds: 0–59. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'.

Hour

Bounds: 0–23. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'.

Day of month

Bounds: 1–31. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'.

Month

Bounds: 1–12 or JAN–DEC. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'.

Day of week

Bounds: 0–7 or MON–SUN; 0 and 7 are Sunday. Supported notation: '*' / '1-5' / '1,3,5' / '*/5' / '5-20/3'.

Five-field Unix by default. A supplied Second enables only the seconds-first extension; this is not Quartz, Jenkins or AWS syntax.

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.

Cron Expression Generator results

Your result will appear here after you generate cron expression. 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?

Build a cron expression from explicit second, minute, hour, day-of-month, month and weekday fields, with a readable schedule. Inputs: Second, Minute, Hour, Day of month, Month, Day of week. Outputs: Cron expression, Human-readable schedule.

How to use it?

Enter each schedule field using the supported notation. Leave Second blank for five-field Unix or enter it to use six fields. Choose “Generate cron expression”, 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.