*/30 * * * *. The minute step resolves to 0 and 30, so the job fires at the top and bottom of every hour — twice an hour, 48 times a day. The equivalent list form 0,30 * * * * is also common.View future cron matches in a calendar
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*/30 * * * *
The minute step */30 resolves to 0 and 30 — two firings per hour, 48 per day. Equivalent to 0,30 * * * * (the explicit list form).
See the dedicated guide for the full breakdown: Cron every minute.
Paste it into the editor above to see the next runs on a calendar.
0,30 9-17 * * 1-5 — every 30 minutes during business hours on weekdays15,45 * * * * — every 30 minutes offset by 15 (xx:15, xx:45)*/30 0-6 * * * — every 30 minutes overnight (midnight to 06:00)*/30 * * * * uses standard 5-field cron syntax, so it works in:
crontab — */30 * * * * /path/to/script.shvercel.json.cron(...) with day-of-week as ? and a year field.0) and append day-of-week ?.`*/30 * * * *`. Paste this into any cron-compatible scheduler (Linux crontab, AWS EventBridge, Vercel cron, Quartz, node-cron, robfig/cron) to run a job every 30 minutes.
The editor above shows the next 30+ runs on a calendar in your local timezone, plus a plain-English description. If the calendar matches your intent, the cron is correct.
It uses standard 5-field cron syntax, so yes — Linux crontab, AWS EventBridge (with the additional `?` and year fields), Vercel cron jobs, Quartz Scheduler, node-cron, robfig/cron, and Kubernetes CronJob all accept it. Vercel's free Hobby plan caps the minimum frequency at once-per-day; the Pro plan removes that cap.
Most schedulers will start the new run anyway, leading to overlap. To prevent this, wrap the command with `flock -n /tmp/myjob.lock /path/to/script.sh` on Linux, or set `concurrencyPolicy: Forbid` on Kubernetes CronJob. Vercel cron and AWS EventBridge let you configure concurrency at the platform level.
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