Build Cron for Kubernetes CronJobs
Kubernetes CronJob resources use standard cron syntax. Build and explain the expression visually.
(0-59)hour
(0-23)day
(1-31)month
(1-12)weekday
(0-6)
In plain English
At 09:00 on Mon, Tue, Wed, Thu, Fri.
- Thu, May 2809:00
- Fri, May 2909:00
- Mon, Jun 109:00
- Tue, Jun 209:00
- Wed, Jun 309:00
Common patterns
Compatible with standard Unix cron, GitHub Actions, Kubernetes CronJob, and most scheduling systems. Use * for “every”, */5 for “every 5”, 1-5 for ranges, 1,15 for specific values.
Kubernetes tips
K8s CronJobs use the same 5-field cron syntax. Paste your generated expression into your `spec.schedule` field.
For periodic cleanup jobs, `0 3 * * *` (3am daily) is a popular choice — low-traffic window for most clusters.
Set `concurrencyPolicy: Forbid` if your job mustn't overlap with itself. Useful for jobs that take longer than the schedule interval.
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Each tweak shows immediate plain-English explanati