构建表达式
0-59
0-23
1-31
1-12
0-6
0 * * * *描述： At minute 0 of every hour
常用预设
接下来 5 次执行
- 1Thu, Mar 19, 12:00 AM
- 2Thu, Mar 19, 01:00 AM
- 3Thu, Mar 19, 02:00 AM
- 4Thu, Mar 19, 03:00 AM
- 5Thu, Mar 19, 04:00 AM
语法指南
* - 任意值
*/5 - 每 5 个单位
1,3,5 - 特定值
1-5 - 值范围
Learn More About Cron
Master cron expressions with detailed guides and ready-to-use patterns:
About Cron Expression Generator
Cron is a time-based job scheduler in Unix-like operating systems. Our free online Cron Expression Generator helps you build, translate, and validate complex cron schedules without having to memorize the syntax.
How It Works
The tool provides a user-friendly interface to select minutes, hours, days, and months. It translates your selections into a standard 5-part or 6-part cron string (e.g., '0 12 * * ?') and calculates the next upcoming execution dates.
Common Use Cases
- Scheduling automated database backups
- Setting up recurring email newsletters or reports
- Configuring CI/CD pipeline triggers (like GitHub Actions)
- Automating server maintenance scripts
Frequently Asked Questions
An asterisk means 'every'. For example, an asterisk in the hour field means the job will run every hour.
Standard cron uses 5 fields (minute, hour, day of month, month, day of week). Systems like AWS CloudWatch or Quartz use 6 fields (adding a year field) and support special characters like '?' and 'L'.