Cron Expression Builder & Explainer
Build a cron expression with a visual UI and read a plain-English explanation. Supports standard 5-field syntax. 100% in your browser.
Runs at: minute=0, hour=9, every day-of-month, every month, day-of-week=1-5.
Cron format
┌──────── minute (0-59)
│ ┌────── hour (0-23)
│ │ ┌──── day of month (1-31)
│ │ │ ┌── month (1-12 or JAN-DEC)
│ │ │ │ ┌─ day of week (0-7 or SUN-SAT; 0 and 7 are Sunday)
│ │ │ │ │
* * * * *About Cron Expression Builder & Explainer
The Cron Expression Builder lets you assemble a schedule using dropdowns and fields instead of memorizing crontab syntax. Choose minutes, hours, days, months, and weekdays, and the tool writes the matching five-field expression along with a plain-English description of when it runs.
The whole tool runs in your browser, so nothing about your schedule is sent anywhere. It is helpful when configuring cron jobs, CI pipelines, or any scheduler that uses standard cron syntax, and the explanation lets you double-check an expression someone else wrote before deploying it.
Frequently asked questions
- Which cron syntax does this support?
- It uses the standard five-field format: minute, hour, day of month, month, and day of week.
- Can it explain an expression I already have?
- Yes. Adjust the fields to match an existing expression and the tool shows a readable description of its schedule.
- Does it support seconds or non-standard fields?
- No. It targets the common five-field syntax, not six-field variants that include a seconds column.