Cron Expression Every 30 Minutes (*/30 * * * *)

// how it works

How `/30 * * *` Works

*/30 * * * * fires twice per hour, at minute 0 and minute 30. This is equivalent to writing 0,30 * * * *. Many developers use this for half-hourly report generation, data syncs, or backup snapshots.

Note: */30 and 0,30 produce the same result. Either works.

Field Breakdown

Field	Value	Meaning
Minute	`*/30`	Every 30th minute (0 and 30)
Hour	`*`	Every hour
Day of month	`*`	Every day
Month	`*`	Every month
Weekday	`*`	Every day of week

// next scheduled runs (UTC)

Next 10 Run Times

Approximate run times starting from the current date. Open in the builder to see exact run times in your timezone.

00:00 00:30 01:00 01:30 02:00 02:30 03:00 03:30 04:00 04:30

// copy-paste ready examples

Platform Examples

Linux / Unix crontab

*/30 * * * * /path/to/script.sh

GitHub Actions

on:
  schedule:
    - cron: '*/30 * * * *'

AWS EventBridge

cron(*/30 * * * ? *)

Kubernetes CronJob

spec:
  schedule: "*/30 * * * *"

node-cron (Node.js)

cron.schedule('*/30 * * * *', () => { ... });

APScheduler (Python)

scheduler.add_job(fn, 'cron', minute='*/30')

// related expressions

Related Cron Expressions

// frequently asked questions

FAQ

What does */30 mean in cron?

*/30 in the minute field means every 30 minutes — at minute 0 and minute 30 of every hour.

Is */30 * * * * the same as 0,30 * * * *?

Yes, they are identical. */30 is shorthand for listing 0 and 30 explicitly.

How do I run a cron job twice a day?

For twice a day (e.g. noon and midnight), use 0 0,12 * * *. For every 12 hours, use 0 */12 * * *.

Build or explain any cron expression

Use the free visual builder — paste an expression for a plain-English explanation, or click your way to a schedule. See the next 10 run times. No login.

Open CronBuilder →

Cron Expression Every 30 Minutes*/30 * * * *

How */30 * * * * Works