0 * * * * ? - every minute (Quartz)

The Quartz cron expression 0 * * * * ? means every minute at second 0, not every second; this page explains each field and lists next runs in your browser.

Unix cron (crontab, GitHub Actions, Kubernetes)

* * * * *

Quartz and Spring (seconds first; valid in both)

0 * * * * ?

AWS EventBridge (minute first, year last)

cron(* * * * ? *)

Read by our parser as: Every minute. Open in the cron checker

Next 10 runs

Calculating in your browser...

At a glance

Accepts: Nothing to enter - the schedule is preset on the page
Outputs: The expression in Unix, Quartz/Spring and AWS form, plus its next 10 run times
Where it runs: Entirely in your browser, on your device
What leaves your device: Nothing - what you type stays in this tab
Limits: Run times use your browser's timezone or UTC; real schedulers can start a run late
Account: Not required - there is no sign-up
Price: Free, with no watermark and no usage cap
Made by: Visrut

What it means

0 * * * * ? runs once a minute, at second 0 of every minute (10:31:00, 10:32:00 ...). It's Quartz or Spring syntax: the leading 0 is the seconds field, then every minute, hour, day and month, with ? in day of week. The Unix cron equivalent is * * * * *.

When this is the right schedule

Use it when you want a minute-by-minute tick in a Quartz or Spring app, starting each run on a whole minute.

When to pick something else

Look elsewhere when you only need the job to run regularly, not on the clock; Spring's fixedRate or fixedDelay is simpler. And if you're writing a crontab, drop the seconds: * * * * *.

Things to watch

The one-character difference

* * * * * ? (asterisk first) runs every second, 60 times as often. The leading 0 is what makes it once a minute. Most "my job runs constantly" bugs in Quartz come from this.

Every N minutes

Change the minute field: 0 */5 * * * ? is every 5 minutes, 0 0/15 * * * ? every 15. Keep the 0 in front.

With the year field

Quartz accepts an optional seventh field for the year, so 0 * * * * ? * is the same every-minute schedule for every year. Spring doesn't have the year field and rejects 7 fields.

Frequently asked questions

What is the frequency of 0 * * * * ?

Every minute, at second 0: 60 runs an hour, 1,440 a day.

What's the Unix cron version of 0 * * * * ?

* * * * *. Unix cron has no seconds field and no ?; it always runs at the start of the minute.