Cron Expression Parser

A cron expression is a string of five fields (minute, hour, day of month, month, day of week) that defines a recurring schedule. It originated in Unix systems and is widely used for scheduling tasks in servers, CI/CD pipelines, and cloud services.

An asterisk (*) means 'every' value. A comma (,) separates a list of values. A hyphen (-) defines a range. A slash (/) defines a step, e.g. */5 means every 5th unit. So */15 in the minute field means every 15 minutes.

No. This parser handles the standard 5-field cron format (minute, hour, day-of-month, month, day-of-week). Some systems like Quartz add seconds and year fields — those are not supported here.

Yes. All parsing, validation, and next-execution calculations run entirely in your browser. No data is transmitted to any server.

Five upcoming executions give a clear picture of the schedule pattern without overwhelming the output. It's enough to verify daily, weekly, monthly, and interval-based schedules at a glance.