Cron Expression Generator & Parser
Generate and parse cron expressions with next execution times
0 * * * *Frequently Asked Questions
What does the cron expression generator do?
It lets you configure "run every …" visually, auto-produces the matching cron expression (e.g., */5 * * * *), and shows a human-readable description plus the next execution times. You can also paste an expression and see what it means.
Which cron dialect is supported?
Both the classic five-field form (min / hour / day / month / weekday) and the six-field Quartz form (seconds added at the front). Confirm your target system's dialect first — Linux crontab is five fields, while Java Quartz and Spring @Scheduled are typically six.
Typical use cases?
Linux crontab jobs (backups, log rotation); CI/CD scheduled builds (GitHub Actions, GitLab CI); Kubernetes CronJobs; task schedulers in Java/.NET frameworks.
Why is cron syntax easy to get wrong?
Day and weekday fields carry "OR" semantics when both are set, and implementations disagree on whether 0 or 1 denotes Sunday. The "next run" preview is the fastest way to verify that your expression behaves as expected.
Does this tool go online? Is my data safe?
No network calls. Parsing and next-run calculation happen entirely in the browser, so configurations are never uploaded.
Cron vs systemd timers vs cloud schedulers?
Cron is the most widely supported — ships with virtually every Linux. systemd timers offer dependency management and better failure handling. Cloud schedulers (AWS EventBridge, Cloud Scheduler, Alibaba SchedulerX) provide cross-host resilience at a cost. Small projects: cron. Large-scale distributed workloads: cloud-native schedulers.