0–59
everyfrom

0–23

1–31

1–12 or JAN–DEC

0–7 (0 and 7 = Sunday) or SUN–SAT

Common schedules

How to write it in Linux crontab

*/30 * * * * /path/to/command
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Nothing is uploaded. Just open it and start.

Cron Every 30 Minutes

Runs on the hour and the half hour, 48 times a day.

*/30 * * * *

Every 30 minutes.

Field by field

FieldValueMeans
Minute*/30minutes 0 and 30
Hour*every hour
Day of month*every day
Month*every month
Day of week*every day

Other common schedules

Build or explain any cron expression →

Frequently asked questions

What is the cron expression for every 30 minutes?
*/30 * * * *. In words: Every 30 minutes. It runs in the time zone of the machine or service that runs it.
How do I write it for Quartz, Spring, GitHub Actions or AWS?
GitHub Actions: */30 * * * *. Kubernetes CronJob: */30 * * * *. Quartz: 0 */30 * * * ?. Spring @Scheduled: 0 */30 * * * *. AWS EventBridge: cron(*/30 * * * ? *).
Can I check when it runs next?
Yes. The tool above lists the next runs in your time zone or any other, shows a month calendar of runs, and warns about runs the clocks skip or repeat. Nothing is uploaded.

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