Cron Expression: */30 * * * *
Every 30 minutes (00 and 30) of every hour.
Field Breakdown
| Field | Value |
|---|---|
| Minute | */30 |
| Hour | * |
| Day of Month | * |
| Month | * |
| Day of Week | * |
Common Use Case
Aggregation jobs, periodic notifications.
Sample Fire Times (UTC)
| When | Unix Timestamp |
|---|---|
| 2026-09-16 23:00 | 1789599600 |
| 2026-09-16 23:30 | 1789601400 |
| 2026-09-17 00:00 | 1789603200 |
| 2026-09-17 00:30 | 1789605000 |
| 2026-09-17 01:00 | 1789606800 |
Sample times computed at build; your scheduler will fire on its own clock.
Equivalents in Popular Schedulers
crontab (Linux/macOS)
*/30 * * * * /path/to/your/script.sh
GitHub Actions (.github/workflows/*.yml)
on:
schedule:
- cron: '*/30 * * * *'
AWS EventBridge (cron format)
cron(*/30 * * * *) # Note: AWS uses 6 fields with year
Kubernetes CronJob
spec: schedule: "*/30 * * * *"