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Cron expression parser

Enter a cron expression to validate it and preview the upcoming runs.

How Cron expression parser works

Cron expression parser takes a cron string (five or six fields: minute, hour, day-of-month, month, day-of-week, and optional seconds) and shows you the next N scheduled run times in plain language. Stop guessing what "0 9 * * 1-5" means and see the schedule laid out as actual timestamps.

It also accepts the shorthand aliases (@daily, @weekly, @monthly) and marks any syntax errors clearly. This is the tool developers reach for when reading or writing cron expressions in CI pipelines, deployment scripts, database jobs and cloud schedulers. It follows the classic Unix interpretation and previews the next ten run times by default, so you can confirm a schedule at a glance.

Frequently asked questions

Is the cron expression I type sent to a server?

No. Parsing and schedule computation run entirely in your browser tab. The cron string you enter is never transmitted to Sunasty or any external service; it is processed by JavaScript running locally on your device.

Which cron syntax does it support?

Standard five-field Unix cron (minute, hour, day-of-month, month, day-of-week), optional six-field cron with seconds, and the common aliases: @yearly, @monthly, @weekly, @daily, @hourly. Quartz and AWS EventBridge extensions may behave differently from standard cron, the tool follows the classic Unix interpretation.

How many upcoming runs does it preview?

By default it shows the next ten scheduled execution times, with exact dates and times so you can immediately confirm the schedule matches your intent.

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.