Automation

Cron Expression Explainer

Expand a five-field cron expression into its matching field values.

Calculations run in your browser. The tool does not send your inputs to a server.

01Your inputs

Local workspace

Start with the sample below, or enter your own values.

Five-field expression

02Your result

Your result will appear here. Choose an action after checking your inputs.

A quick guide

How to use this tool

Check the example and the unit beside each input.
Enter your values and choose Explain.
Review the result and assumptions, then copy what you need.

Reset example restores the starting values. Clear removes text and number inputs, returns choices to their first valid option, and removes the result.

Reference guide

Explanation and worked examples

A step selects values within a field. It may not represent an evenly spaced elapsed interval across hour or day boundaries.

Use in day-to-day IT work

Draft a recurring schedule for a maintenance or reporting job.

Checks before applying the result

This tool uses numeric five-field cron in UTC. Windows Task Scheduler, Quartz and cloud schedulers can use different fields and semantics.
Set the actual scheduler timezone explicitly; test next runs and avoid overlapping jobs.

New to the terminology?

Backoff: Waiting progressively longer between retry attempts.
Jitter: Varying delays to avoid many clients retrying together.
Cron: A field-based expression selecting scheduled times.

Keep exploring

How calculations work and where the models stop →