Cron Expression Generator — Build Cron Schedules Visually

What is Cron Generator?

A cron expression describes a recurring schedule using five whitespace-separated fields: minute, hour, day-of-month, month, day-of-week. It looks cryptic — `0 9 * * 1-5` runs at 9 AM on weekdays — and getting the field semantics right (especially the OR between day-of-month and day-of-week) trips up almost everyone once. Rather than writing the expression by hand, a cron generator lets you pick a schedule intent from a UI and produces the correct expression. This tool covers the 10 most common schedule shapes plus a free-form custom mode, and always shows the plain-English description and the actual next-5 run times so you can verify the schedule before shipping.

How to build a cron expression online

1. 1Pick a schedule preset — e.g. 'Weekly on a chosen day' or 'Every N minutes'.
2. 2Fill in the parameters shown for that preset (minute, hour, day, N, …).
3. 3The 5-field cron expression appears at the top of the results card, ready to copy.
4. 4Read the plain-English description and next 5 run times to confirm the schedule matches your intent.
5. 5Switch to 'Custom expression' to hand-write a cron string and use the same preview / description features.

Tips & Best Practices

• ▸cron on most servers runs in UTC — if you want 9 AM local, offset the hour field by your UTC offset (or verify the target scheduler's timezone setting).
• ▸day-of-month (field 3) and day-of-week (field 5) are OR'd when both are restricted — `0 9 1 * 1` fires on the 1st of the month AND on every Monday, not their intersection.
• ▸GitHub Actions ignores schedules more frequent than 5 minutes on public repos, and can be delayed under load. Don't use cron for hard real-time triggers.
• ▸For sub-minute schedules, use a systemd timer with OnUnitActiveSec or a long-running process; cron cannot do it.