AWS has their own crontab syntax, slightly different from regular Cron. But there is no validation tool before you submit something. It just rejects it. I want something like crontab.guru but for cloudwatch syntax. It's such a small usecase but it'd be great.
I say "almost" because Quartz Scheduler expressions have one additional field: seconds. And there are more than likely differences in how nontrivial expressions and corner cases are handled by different tools.
