Cron Expression Generator

Build and parse standard 5-field CRON strings with instant validation and next run preview.

Builder

0–59. Use * for any, lists (e.g. 10,20), ranges (10-30), and steps (*/5).
0–23. Supports lists, ranges, and steps. * means every hour.
1–31. Use * for any day.
1–12 or names JAN…DEC. Lists, ranges, steps allowed.
0–6 (Sun=0) or names SUN…SAT. Use MON-FRI for weekdays.
* * * * *

Parser

We support standard 5-field UNIX style: minute hour day month weekday.

Next run times (local)

    Quick examples

    How it works

    Enter values for minute, hour, day, month, and weekday to build a standard 5-field CRON string. We validate as you type, and simulate the next run times on your device (approximate, client-side only). You can also paste a CRON into the parser to see a human-readable breakdown and update the builder fields instantly.

    FAQs

    Is this tool free and private?

    Yes. It runs entirely in your browser—no uploads or servers involved.

    Which CRON format is supported?

    Standard UNIX 5-field CRON: minute hour day month weekday. We support lists, ranges, and steps (e.g. */5), plus month and weekday names (JAN…DEC, SUN…SAT). Advanced descriptors like L, #, or ? are not supported.