What cron expression runs twice a month on the 1st and 15th at midnight?

The cron expression `0 0 1,15 * *` runs twice a month on the 1st and 15th at midnight. Paste this into your crontab file, Vercel cron config, GitHub Actions schedule, or any cron-compatible scheduler.

How do I test the cron expression 0 0 1,15 * *?

Use a cron tester like crontab.guru or run `crontab -l` to list current jobs. For dry-run testing, many schedulers (Vercel, GitHub Actions, AWS EventBridge) have a "test schedule" or "preview next runs" button.

How do I add "0 0 1,15 * *" to my crontab?

Run `crontab -e` to edit your crontab, add a new line with `0 0 1,15 * * /path/to/your-command`, and save. The command will run on the schedule you specified. Check `/var/log/syslog` or `journalctl -u cron` for execution logs.

Does this cron expression work on Vercel / GitHub Actions / AWS?

Yes, `0 0 1,15 * *` is a standard 5-field POSIX cron expression (or 6-field for Quartz/Spring). It works on Vercel Cron Jobs, GitHub Actions (`schedule: [{ cron: '0 0 1,15 * *' }]`), AWS EventBridge, Google Cloud Scheduler, Kubernetes CronJobs, and most Linux cron daemons.

Cron Expression: Twice a month on the 1st and 15th at midnight

Cron Expression

0 0 1,15 * *

Twice a month on the 1st and 15th at midnight

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Quick Answer

The cron expression for "twice a month on the 1st and 15th at midnight" is `0 0 1,15 * *`. Copy and paste this into your crontab, Vercel cron config, GitHub Actions workflow, or any standard cron-compatible scheduler.

Field-by-Field Breakdown

Field	Value	Meaning
Minute	0	At minute 0
Hour	0	At hour 0
Day of Month	1,15	At day of month values: 1,15
Month	*	Every month
Day of Week	*	Every day of week

Common Use Cases

→Bi-monthly payroll
→Twice-monthly reports

How to Use This Expression

Vercel Cron Jobs

// vercel.json
{
  "crons": [{
    "path": "/api/your-endpoint",
    "schedule": "0 0 1,15 * *"
  }]
}

GitHub Actions

# .github/workflows/scheduled.yml
on:
  schedule:
    - cron: '0 0 1,15 * *'

Linux crontab

0 0 1,15 * * /path/to/your-command.sh

Frequently Asked Questions

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