Cron Expression Parser & Schedule Preview
Parse Unix cron expressions, generate a human-readable description, and preview the next 10 scheduled run times. Supports both 5-field standard cron and 6-field (with seconds) Quartz-style expressions.
Usage
Cron is a compact syntax for scheduling tasks on Unix systems, also used by Quartz, Airflow, Kubernetes CronJob and many others.
Built on cron-parser and cronstrue — everything runs locally.
Field rules (standard 5 fields)
- Minute 0–59
- Hour 0–23
- Day 1–31
- Month 1–12 (also JAN-DEC)
- Weekday 0–6, where 0 = Sunday
Use cases
FAQ
Five-field or six-field cron?
Standard Unix cron is 5 fields (minute hour day month weekday). Quartz / Spring is 6 fields (with seconds first). This tool supports both.
Is weekday 0 Sunday or Monday?
Standard Unix: 0 = Sunday, 1–6 = Monday to Saturday, 7 also = Sunday (compatible).
What if I set both day-of-month and day-of-week?
Most implementations use OR. Quartz requires one of them to be ? meaning 'not specified'.
Which timezone is used?
The browser's local timezone for next-run display. Server cron typically uses the system timezone.
What does */5 mean?
Every 5 units. */5 * * * * = every 5 minutes; 0 */2 * * * = every 2 hours on the hour.