0 */12 * * *. Twice a day, at midnight and noon. The same as 0 0,12 * * * — use whichever your team finds clearer.View future cron matches in a calendar
Showing next 1000 cron schedules
0 */12 * * *
The hour step */12 resolves to 0 and 12 — twice a day, at midnight and noon. Equivalent to 0 0,12 * * * (explicit list form).
See the dedicated guide for the full breakdown: Cron every hour.
Paste it into the editor above to see the next runs on a calendar.
0 0,12 * * * — explicit list form (equivalent)0 6,18 * * * — every 12 hours at 06:00 and 18:000 0,12 * * 1-5 — every 12 hours on weekdays only0 */12 * * * uses standard 5-field cron syntax, so it works in:
crontab — 0 */12 * * * /path/to/script.shvercel.json.cron(...) with day-of-week as ? and a year field.0) and append day-of-week ?.`0 */12 * * *`. Paste this into any cron-compatible scheduler (Linux crontab, AWS EventBridge, Vercel cron, Quartz, node-cron, robfig/cron) to run a job every 12 hours.
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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