Cron Generator
Build a schedule with simple controls, or paste a cron expression to read it in plain English, with the next run times. Runs entirely in your browser.
The five cron fields
A standard cron expression is five fields separated by spaces, each controlling one unit of time:
minute(0–59)hour(0–23)day of month(1–31)month(1–12)day of week(0–6, where 0 and 7 are both Sunday)
Read together, 0 9 * * 1-5 means “at 09:00, Monday through Friday.”
The operators
*: every value (“every minute”, “every day”).,: a list, e.g.1,15,30.-: a range, e.g.1-5(Mon–Fri)./: a step, e.g.*/15(every 15 units) or0-30/10.
A subtle gotcha: day-of-month vs day-of-week
When both day-of-month and day-of-week are restricted (neither is *),
classic cron runs the job when either matches, an OR, not an AND. So
0 0 13 * 5 fires on the 13th and every Friday, not just Friday the 13th.
Keep one field as * to avoid surprises.
FAQ
Is this standard cron or the 6-field variant?
This tool uses the classic 5-field crontab format used by Linux cron, most CI schedulers, and Vercel Cron. Some systems (Quartz, some Kubernetes setups) add a seconds field for 6 fields.
What timezone do the next run times use?
The preview next-run times are computed in your local timezone for readability. Real cron runs in the server’s timezone, check your platform’s docs (many CI systems default to UTC).
Does anything get uploaded?
No. Parsing and the next-run preview are computed in your browser, so it works offline.
Related references
Scheduling a job that emits JSON? Type it with JSON → TypeScript. Refreshing auth on a schedule? Inspect tokens with the JWT decoder.