Cron expression parser.

Five fields separated by spaces: minute (0–59), hour (0–23), day of month (1–31), month (1–12 or JAN–DEC) and day of week (0–7 or SUN–SAT, with 0 and 7 both Sunday). A star means every value, a slash a step (*/5), a dash a range (1-5) and a comma a list (1,15).

Minute 0 of hour 9 on any day of the month, any month, Monday to Friday: weekdays at 09:00. The English line under the field says exactly that, and the next runs list shows the dates it lands on.

When both are set to something other than a star, standard cron runs when either matches, not both: 0 0 13 * 5 fires on the 13th of every month and on every Friday. The next-runs list makes that visible.

Yes: @hourly, @daily (or @midnight), @weekly, @monthly and @yearly (or @annually) are expanded to their five fields. A six-field expression with seconds first, as Spring and some Node schedulers use, is read too, and so are L (last), W (nearest weekday) and # (nth weekday).

The expression is parsed by cron-parser and described by cronstrue, two well-used open source libraries, running in your browser. The next runs are computed from the current moment in the zone you choose, daylight saving changes included.

Type it in the field or click one of the common schedules. The English reading, the next runs and the field breakdown update as you type; an error names what is wrong.

Pick the zone in the bar: your own, UTC, or any IANA zone such as America/New_York. Most hosted schedulers (GitHub Actions, Kubernetes by default, AWS) run in UTC, so a 09:00 job there is 05:00 in New York in summer.

No. The page makes no request with the expression; both libraries run on your device, and the tool works offline once loaded.

No. The Cron expression parser is free and opens without a sign-in, an account or an install.

Nothing. The Cron expression parser holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.

Yes: six fields are read with a leading seconds field. Five fields are the usual minute, hour, day of month, month and day of week.

5, 10 or 20 at a time, chosen in the bar, in UTC or in the time zone your browser reports.

It reads standard cron with an optional seconds field. Platform extras, such as Quartz's year field or a scheduler's own macros, are not modelled, so check an expression made for one of those against that platform's documentation.

Pick a preset such as every 5 minutes, weekdays at 9:00, daily at midnight or the first of the month, then edit it. The English sentence and the next runs update as you change it.

Closest to the Cron expression parser: Crontab generator, Unix timestamp converter, Time zone converter, Regex tester. Each opens on its own page, free and in the browser.

The Cron expression parser is one of 20 in its group. The group's page, /tools/security, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.