Cron Explainer

Explains a cron expression in plain English.

Cron Explainer turns a cron expression into a plain English description so you can verify what a crontab schedule actually does. Paste a cron expression and instantly see when it runs, which helps when reading, debugging, or reviewing scheduled jobs. Everything runs in your browser, so no setup or command line is needed.

Common uses

  • Double-check a crontab line before deploying a scheduled job
  • Understand an unfamiliar cron expression in someone else's config or CI pipeline
  • Confirm a schedule like '0 9 * * 1-5' means weekday mornings
  • Translate cron entries while documenting recurring tasks or backups
  • Spot mistakes in fields (minute, hour, day, month, weekday) by reading the description back

FAQ

Is my data sent to a server?

No. The cron expression is parsed entirely in your browser using a JavaScript library, and nothing is uploaded or stored remotely.

What cron format does it accept?

It accepts standard cron expressions and parses them with the cronstrue library, including the common five-field format (minute, hour, day of month, month, day of week) plus extensions cronstrue supports.

What happens if my expression is invalid?

Parsing throws on invalid expressions, so the tool shows an error instead of a description. Fix the offending field and the explanation will update.

Does it schedule or run cron jobs for me?

No. It only explains what an expression means in plain English; it does not execute, schedule, or store any jobs.

Does leading or trailing whitespace matter?

No. The input is trimmed before parsing, so surrounding spaces are ignored.

Related tools

  • Cron Next Runs
  • Crontab Cheatsheet
  • Date Difference
  • Date Info
  • Duration Formatter
  • Relative Time
  • Unix Timestamp Converter
  • Timezone Converter