Free Local utilities
Cron tester
Preview five-field Unix cron schedules with a time zone, reference time, presets and occurrence count. This previews times; it does not schedule jobs.
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How it works
Searches strictly after the reference minute for at most 366 days. Supports numbers, *, ranges, lists, steps and English three-letter month/day names. Restricted day fields use Unix OR semantics. Each real UTC minute is matched in the selected time zone, including clock changes.
Assumptions and limitations
Five-field preview only: no seconds/year, Quartz L/W/#, commands or scheduling. Missing wall-clock times do not match; repeated wall-clock times can appear twice with different UTC instants. A real cron service may apply different DST policies. Fewer results may fit within 366 days; no match is an error.
How to use this tool
Choose a preset or enter five fields: minute, hour, day of month, month, day of week. Select the schedule time zone, optional UTC reference and 1–20 occurrences. UTC ISO instants and localized wall-clock times are shown.
Worked example
Demonstration data only. Loading an example replaces the inputs but does not run the tool.
0 9 * * 1-5 (UTC)
Frequently asked questions
What should I check before using this result?
Five-field preview only: no seconds/year, Quartz L/W/#, commands or scheduling. Missing wall-clock times do not match; repeated wall-clock times can appear twice with different UTC instants. A real cron service may apply different DST policies. Fewer results may fit within 366 days; no match is an error.
Are my inputs or results saved automatically?
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Processing and privacy
No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.
Privacy PolicyHelp
Choose a preset or enter five fields: minute, hour, day of month, month, day of week. Select the schedule time zone, optional UTC reference and 1–20 occurrences. UTC ISO instants and localized wall-clock times are shown.
Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.
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