Online Tool Store
Cron Expression Builder
Maakt en controleert vijfveld cron-expressies door werkelijke volgende starttijden te berekenen. Waarschuwt wanneer twee dagvelden OR-gecombineerd zijn, detecteert planningen die nooit worden gestart.
🔒 Deze tool werkt volledig in je browser. Je bestanden worden nooit naar een server geüpload.
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
What it means
Next runs
Syntax reference
| * | Every value |
| 5 | Exactly 5 |
| 1,3,5 | A list — 1, 3 and 5 |
| 1-5 | A range — 1 through 5 |
| */15 | Every 15th value from the start |
| 9-17/2 | Every 2nd value from 9 to 17 |
| MON-FRI | Names work in the last two fields |
Both 0 and 7 mean Sunday. This tool handles the classic five-field syntax — extensions such as
@daily, L, W,
# and a seconds field are specific to particular schedulers and are not parsed here.
Evaluated in this page; nothing is uploaded. Times are computed in UTC by default because that is what a server's crontab usually runs in — but a real cron runs in the machine's timezone, so check what yours is set to before trusting a schedule around a daylight-saving change.
How Cron Expression Builder works
- Open Cron Expression Builder and review the example state before entering your own values.
- Enter or select the information needed for Cron Expression Builder.
- Review the result and adjust the inputs if you want to compare another case.
Builds and checks five-field cron expressions by computing the actual next run times. Warns when the two day fields are OR-combined, detects schedules that never fire such as 31 February, and explains uneven step intervals. The interactive workspace runs in your browser, so you can review the result without creating an account.
FAQ
What is Cron Expression Builder used for?
Builds and checks five-field cron expressions by computing the actual next run times. Warns when the two day fields are OR-combined, detects schedules that never fire such as 31 February, and explains uneven step intervals.
Do I need an account?
No. The tool is available directly in the browser without an account or sign-up.
What should I do if the result looks unexpected?
Check the entered values and compare them with the guidance shown in Cron Expression Builder. Use the result as a planning aid and verify important decisions independently.