Preset

Cron expression for every 12 hours

0 */12 * * *

Cron expression5-field

On the hour, every 12 hours

Lint

OKNo issues found — this expression is well-formed.

Next runs

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What it does

The cron expression 0 */12 * * * runs a job every 12 hours — in plain terms, on the hour, every 12 hours. Every field not shown as a restriction stays *, meaning "no limit", so the schedule repeats on that pattern indefinitely.

Paste it into the tool below to see the next seven runs in both the schedule's time zone and yours, a field-by-field breakdown, and any lint warnings. Times are computed for the schedule zone (UTC by default); switch either column if your server or your own zone differs.

Standard 5-field cron drives most schedulers — Linux crontab, Kubernetes CronJobs, GitHub Actions, and others — though details like time-zone handling and step support vary. The lint checks below flag the portability and correctness traps that apply to this pattern.

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FAQ

What does 0 */12 * * * mean?

On the hour, every 12 hours. It runs every 12 hours.

Is 0 */12 * * * standard cron?

Yes — it uses only the standard 5-field syntax (minute, hour, day-of-month, month, day-of-week), so it works in mainstream schedulers. Check the lint output below for any dialect-specific caveats.

How do I see the next runs in my time zone?

The tool below shows a "Your time" column detected from your browser alongside the schedule time zone, so you can confirm exactly when it fires for you.