AWS EventBridge Cron Expression Tester
Check cron(…) and rate(…) schedules before deploying — errors explained, next runs listed, CLI and Terraform ready to paste.
Help shape AWS EventBridge Cron Expression Tester
The bug you just noticed will fade in 3 minutes. The feature idea will vanish after your next tab switch. Crazy peps don't suffer silently.
Frequently Asked Questions
cron(minutes hours day-of-month month day-of-week year), e.g. cron(0 12 ? * MON-FRI *). One of the day fields must be “?”, weekdays run 1–7 from Sunday, and the year field is required.
Most often both day fields are set (one must be “?”), there are only five fields (the year is missing), or weekday 0 is used (AWS starts at 1). The tester explains the exact problem and how to fix it.
EventBridge rules run in UTC. EventBridge Scheduler supports a timezone through ScheduleExpressionTimezone — the Code tab shows both, and the runs list can display any timezone.
rate(5 minutes) repeats from when the rule is created or enabled; it isn't aligned to the clock. Use cron() when a job must fire at exact times like :00.
No. Validation happens entirely in your browser.