CareerByteCode

Cron Expression Generator and Explainer

For DevOps engineers and sysadmins writing crontab entries, Kubernetes CronJobs and CI schedules. Type an expression and get a plain-English meaning plus the next five times it would fire.

FreeRuns in your browserNothing uploadedNo sign-up neededAll 16 tools in the DevOps Toolbox
Keep this resultSign in to email it to yourself or save it to your profile. The tool itself never needs an account.

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How to use

How to use the Cron Expression Builder

  1. Type a 5-field cron expression (minute hour day-of-month month day-of-week) into the box.
  2. Click Explain and preview.
  3. Read the Meaning line for a plain-English description.
  4. Check Run 1 to Run 5 for the next times it fires, in your local time zone.
Worked example

An example, step by step

You enter

0 9 * * 1-5

The tool shows

Meaning: At minute 0 past hour 9, on every day-of-month, in every month, on Mon-Fri. Runs: 09:00 on each of the next five weekdays.

FAQ

Questions about the Cron Expression Builder

What does */15 mean in a cron expression?

A step value: */15 in the minute field fires at minutes 0, 15, 30 and 45. In the hour field it would mean every 15 hours starting from 0.

Does the tool support names like MON or JAN?

No. Use numbers: 0 to 6 for day of week (0 is Sunday) and 1 to 12 for months. Lists like 1,3,5 and ranges like 1-5 work.

Which time zone are the previewed run times in?

Your browser local time zone. Servers and Kubernetes CronJobs often run in UTC, so shift the hour field if your scheduler uses a different zone.

Is the Cron Expression Builder free and private?

Yes. It is free, needs no sign-up and runs entirely in your browser, so what you type is not uploaded. You only sign in if you want to email a result to yourself or save it to your CareerByteCode profile.

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