devops/inspector
Cron Expression Visualizer - Free & Instant | Smocky
Unix cron with five fields, in UTC only. Each Schedule occurrence is a calculated instant, not evidence that a job ran — the earlier list includes hypothetical past occurrences, not a run history.
Frequently asked questions
Does the Execution timeline show whether a job actually ran?
No. Each Schedule occurrence is a calculated instant that matches the Cron expression, not evidence that a job started or finished. The earlier occurrences are hypothetical, not a run history.
What happens when both the day-of-month and weekday fields are restricted, like "1 * MON"?
Under Cronie semantics, when neither field is a wildcard they combine with OR: a day matches if it is the first of the month or a Monday. If either field is left as "*", the schedule instead requires both conditions (AND), which in practice means only the restricted field matters.
Does this Tool support seconds, Quartz syntax, or full crontab files?
No. It reads exactly five whitespace-separated fields — minute, hour, day-of-month, month, and weekday — in UTC only. Seconds fields, Quartz extensions, cron macros like @daily, and multi-line crontab files are not supported.