# Cron Schedule Builder

URL: https://phishdestroy.io/developer-tools/cron-schedule-builder
Category: General dev
Where it runs: Runs locally (nothing you enter is uploaded)

Put together a standard five-field cron expression from separate fields or from common presets.

## Example input

Every 15 minutes, weekday mornings

```
*/15
```

With the other fields at their defaults (hour 9, weekdays 1-5) the expression is */15 9 * * 1-5: runs at 9:00, 9:15, 9:30 and 9:45, Monday to Friday.

## FAQ

### Does the builder check that the expression is valid?

No. It joins the five fields with spaces exactly as typed, so 99 in the minute field ends up in the result. Paste the expression into the Cron Expression Parser to read it back in plain English.

### What if both day of month and day of week are set?

Standard (Vixie) cron runs the job when either field matches, not only when both do, so 0 9 1 * 1 runs on the 1st of every month and on every Monday. The builder has no seconds field and does not produce macros such as @daily or @reboot.

### Is anything sent to a server?

No. The expression is put together in your browser and nothing is uploaded. Remember that cron uses the time zone of the machine that runs it.

## Related tools

- [Cron Expression Tester](https://phishdestroy.io/developer-tools/cron-expression-parser)
- [Unix Timestamp Converter](https://phishdestroy.io/developer-tools/unix-timestamp-converter)
- [Chmod Calculator](https://phishdestroy.io/developer-tools/chmod-calculator)
- [Docker Run to Compose Converter](https://phishdestroy.io/developer-tools/docker-run-to-compose)

All tools: https://phishdestroy.io/developer-tools