K8sTools

CronJob schedule calculator

Enter a schedule and time zone, or paste a CronJob. The next runs are listed in both the job’s zone and UTC.

Schema pack 2026.10.0, self-authored. What it covers

CronJob

Opening local draft…

Schedule

Runs at 02:30 on Mon, Tue, Wed, Thu, Fri

What the other fields do

concurrencyPolicy
Forbid
startingDeadlineSeconds
300
suspend
false
history (ok / failed)
3 / 1
backoffLimit
2
activeDeadlineSeconds
1800
  • Forbid: a run is skipped while the previous Job is still running.
  • A run that cannot start within 300s of its schedule is counted as missed.
  • A failed pod is retried up to backoffLimit times with exponential back-off before the Job fails. That planning is arithmetic. Wall-clock completion is not guaranteed.
Passes pack schema4 warning(s)Kubernetes 1.31, pack 2026.10.0

container "report" does not set allowPrivilegeEscalation: false.

container "report": runAsNonRoot is not true at container or pod level.

container "report" does not drop ALL capabilities.

container "report": seccompProfile is unset at container and pod level.

Schedule semantics

CronJob uses five fields: minute, hour, day of month, month, day of week. When both day fields are restricted, a run happens if either matches, which is standard cron behaviour. Without spec.timeZone (GA since 1.27), the controller uses the kube-controller-manager’s zone, which is usually UTC but cannot be known from the manifest.

The preview is arithmetic. Missed schedules, startingDeadlineSeconds, concurrencyPolicy and controller downtime decide whether a Job actually starts.

Questions

Can I put TZ= in the schedule?

No. CronJob validation rejects TZ= and CRON_TZ= in spec.schedule. Use spec.timeZone.

What happens across daylight saving changes?

Runs whose wall-clock time is skipped do not appear in the preview, and repeated times can appear twice. Check the controller’s behaviour for your version before relying on runs near the transition.

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