Cron Expression Builder

Explain crontab schedules and preview next runs

100% Private: Parsing and run-time calculation happen locally in your browser. Nothing is sent to any server.

Minute
0-59

Hour
0-23

Day (month)
1-31

Month
1-12

Day (week)
0-6

Presets

Meaning

Field Breakdown

Next Runs

Cron Builder Features

Plain-English Explanation: Instantly understand what any crontab schedule does.
Next Run Preview: See the upcoming fire times so you can sanity-check a schedule.
Full Syntax Support: Ranges, lists, steps, names (JAN, MON) and shortcuts like @daily.
Handy Presets: One-click common schedules to start from.

Perfect For

Server Cron Jobs: Author and verify Linux crontab entries with confidence.
CI/CD Schedules: Build cron triggers for GitHub Actions and pipelines.
App Schedulers: Configure background jobs, queues and reminders.
Learning Cron: Experiment safely and see exactly when things fire.