DevEquiv

    Quartz Cron to Unix Cron Converter

    Paste a Quartz cron trigger expression to get the equivalent Unix cron expression — with explicit warnings whenever seconds-level precision or a year restriction can't survive the conversion.

    Requires review

    Quartz cron
    0 0 9 ? * MON-FRI *
    Unix cron
    0 9 * * MON-FRI

    Main limitation: Quartz's seconds field is dropped entirely, which is exact only when it's exactly "0" — anything else (like "0/30" for every 30 seconds) means the schedule genuinely cannot run more than once a minute under Unix cron, and this is flagged rather than silently rounded.

    Examples

    Weekday mornings at 9am

    Quartz cron 0 0 9 ? * MON-FRI *
    Unix cron 0 9 * * MON-FRI

    An exact conversion — zero seconds, a wildcard year, and day names that don't need renumbering.

    Last day of the month (no Unix equivalent)

    Quartz cron 0 0 0 L * ? *
    Unix cron 0 0 L * *

    The `L` (last day of month) token is preserved literally in the output but flagged as unsupported — standard Unix cron has no field value that means "the last day of the month", so this schedule will not actually run as written; see the caveat above for common workarounds.

    Caveats

    Caveat

    Quartz's seconds field is dropped entirely, which is exact only when it's exactly "0" — anything else (like "0/30" for every 30 seconds) means the schedule genuinely cannot run more than once a minute under Unix cron, and this is flagged rather than silently rounded.

    Caveat

    A specific Quartz year (e.g. "2030") has no Unix cron equivalent at all — Unix cron has no year field, so the converted schedule will recur every year instead of just once, and this is flagged as a real semantic change, not a formatting detail.

    Caveat

    Quartz's "?" (no specific value) becomes Unix cron's "*" automatically, since Unix cron has no "?" concept and "*" means the same thing: no restriction on that field.

    Caveat

    Quartz-only features with no Unix equivalent at all — L (last day), W (nearest weekday), and # (nth weekday of month) — are flagged with an explanation rather than dropped silently, since there is no cron-native workaround for them.

    References

    • Quartz Scheduler docs — CronTrigger Tutorial — checked 2026-07-29
    • crontab(5) — POSIX cron expression format (man7.org) — checked 2026-07-29

    Last verified 2026-07-29.