A cron expression is a compact string used by Unix-like schedulers (crontab, systemd timers, Kubernetes CronJobs, CI/CD pipelines) to define recurring schedules. The five fields represent minute, hour, day of month, month, and day of week, and together they can express nearly any repeating schedule from once per minute to once per year.
Memorizing cron syntax is error-prone, especially for complex schedules involving ranges, step values, or combinations of fields. This visual cron builder lets you construct expressions by selecting from dropdowns and immediately see a plain-English description of what the schedule means. You can also paste an existing expression to verify it does what you expect.
The next-execution preview calculates the upcoming five run times based on your current local time, so you can confirm the schedule before deploying it. All processing happens in your browser with no server calls.