Cron Expression Builder
Build a 5-field cron expression with a short description.
Everything is built in your browser. Nothing you enter is sent anywhere.
Tool
Cron fields
Standard 5-field cron: minute hour day-of-month month day-of-week.
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About the cron expression builder
Build standard 5-field cron expressions with presets or custom values. See the expression and a plain-language description as you edit.
Field order
Minute, hour, day of month, month, day of week — the common Unix cron format used by crontab, GitHub Actions, and many schedulers.
Syntax
Use * for every value, */n for steps, ranges like 1-5, and lists like 0,15,30. Day of week is 0–6 with Sunday as 0.
Presets
Quick-start with every minute, hourly, daily at midnight, or weekdays at 9 AM — then tweak individual fields.
Privacy first
Building runs locally in your browser. Nothing you enter is sent to a Dockzio server.
FAQ
Quick answers to common questions.