What does this tool do?
Validate cron field syntax and bounds locally and see a clear Valid or Invalid status with the error message. Inputs: Cron expression. Outputs: Valid/Invalid status, Error message.
How to use it?
Enter the expression to validate. Invalid expressions are reported as a status and error message. Choose “Validate cron expression”, then copy individual result values. Clear restores the initial field defaults and removes results and messages.
Supported syntax: five-field Unix cron or the explicitly entered six-field seconds-first extension. Not a Quartz, Jenkins, AWS EventBridge or Kubernetes configuration converter. Parsing and calculation never execute jobs. Human descriptions use only the listed deterministic phrases. Next Run is bounded to eight years within 1970–2099 and uses the browser’s IANA data, skipping missing wall times and considering both repeated instants.