Cron Expression Generator
Build, validate and explain standard 5-field Unix cron schedules. Preview upcoming run times in a selected timezone and copy the expression when it is ready.
Unix 5-field syntax
This tool validates minute, hour, day of month, month and day of week fields. Quartz seconds and year fields are not interpreted.
Timezone-aware preview
Upcoming runs are calculated against the selected IANA timezone using browser date APIs, including daylight saving behavior.
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Cron expressions are parsed locally. Analytics use safe schedule buckets only, not the raw expression you type.
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Frequently asked questions
Which cron syntax does this generator support?
This MVP supports standard 5-field Unix cron syntax: minute, hour, day of month, month and day of week. Quartz 6-field and 7-field expressions are not interpreted on this page.
Are cron expressions uploaded to Convertr?
No. Validation, explanation and next-run previews run locally in your browser. Raw expressions are not sent to Convertr servers.
How are day-of-month and day-of-week handled?
When both fields are restricted, this page follows common Unix crontab behavior and runs when either field matches.
Do timezone and daylight saving changes matter?
Yes. The next-run preview evaluates the selected IANA timezone with your browser Intl APIs, so daylight saving transitions can skip or duplicate local wall-clock times.