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Cron Expression Parser

Cron Expression Parser

Explain standard five-field cron expressions in plain English for crontab, workers, and CI schedules.

Cron Expression Parser workspace

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Decode standard cron expressions into plain English for crontab entries, workers, and CI schedules—locally in your browser.

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Reading cron syntax quickly

Five-field cron strings are compact but easy to misread. A cron parser online explains minute, hour, day-of-month, month, and day-of-week fields in human language before you edit production schedules.

Supported expression styles

The parser focuses on common Unix-style cron patterns including ranges, steps, and lists. Validate expressions here before pasting into servers or workflow YAML.

How it works

  1. 1Paste a five-field cron expression such as `0 */6 * * *`.
  2. 2The parser validates syntax and returns a human-readable schedule description.
  3. 3Use the explanation when reviewing jobs without modifying server crontabs here.

Examples

Every six hours

0 */6 * * *

Weekday mornings

15 2 * * 1-5

Weekly Sunday job

0 0 * * 0

Every minute (demo)

* * * * *

When to use this tool

  • Explain GitHub Actions cron schedules.
  • Review legacy crontab lines during migrations.
  • Document worker schedules for on-call runbooks.
  • Sanity-check staging job timing before promote.
  • Teach junior engineers cron field order.
  • Pair with timestamp converter for claim exp review.

Frequently asked questions

Does this calculate next run times?

It provides human-readable descriptions. Use your scheduler for exact next executions.

Are time zones handled?

Descriptions follow the expression only; apply server timezone context separately.

Is data uploaded?

No. Parsing is local.

What if parsing fails?

Invalid expressions show an error so you can fix fields.

Does this support seconds field?

Standard five-field Unix cron is supported.

Related tools?

Use timestamp converter when inspecting JWT exp values alongside schedules.