Cron Expression Parser & Generator

A cron expression describes when a scheduler should run a job. This tool accepts five fields (minute hour day-of-month month day-of-week) and a six-field, Quartz-style form with seconds at the start. Other schedulers may use different field orders or rules.

It provides a field breakdown, a plain-language description, upcoming run times in local time and UTC, and a visual builder. It works in the browser after the page has loaded. Compare an expression with the documentation for the scheduler where you plan to use it.

The common five-field form is minute hour day-of-month month day-of-week. This tool's six-field, Quartz-style form adds seconds at the start. AWS EventBridge and other schedulers may use different field counts and conventions; do not assume an expression can be pasted unchanged from one format into another.

One possible cause is a difference between the time zone used to interpret the schedule and the time zone you expected. This tool shows previews in your browser's local time and UTC; the scheduler may use a configured zone or its host's default. Check that scheduler's time-zone settings before deploying.

This parser accepts some Quartz-style special values in its six-field mode, including L, W, #, and ?. The exact support and weekday numbering can differ between schedulers; in this tool, weekdays use Sunday as 0 (or 7) and Monday as 1. Check your target scheduler before reusing an expression.

Use Visual Builder: set Minute to */15, Hour to 9-17, Day and Month to *, and Weekday to 1-5. It builds */15 9-17 * * 1-5, which runs every 15 minutes from 9:00 AM through 5:45 PM on weekdays.

* means every value; */5 means every 5 units; 9-17 is a range; and 1,3,5 is a list. For example, 0,30 9-17 * * 1-5 runs on the hour and half-hour during the listed weekday hours.

The parser processes the expression in your browser after the page loads. The expression is also placed in the page URL so you can share it; avoid putting sensitive information in a URL.

Yes. The expression is added to the page URL, so you can share the link to show the same expression and its parsed result.

The tool checks candidate times minute by minute for up to two years, stopping when it finds 10 matches. Six-field expressions are evaluated at the start of each minute, so this preview does not show separate runs for seconds within a minute. The preview is an aid; confirm the schedule with your target scheduler, especially for special values and time-zone rules.