Your cron expression can be valid and still never run A cron parser can answer one question— does this have five fields and legal tokens? —while your scheduler needs a different answer: will this job ever run, and will it run when I intended? That gap is where silent cron failures live.
Source: [Dev.to](https://dev.to/takeaseatventure/your-cron-expression-can-be-valid-and-still-never-run-4alg)