Cron Expression Tool

表达式模式

可视化构建

Cron 表达式

*

分钟
0-59

*

小时
0-23

*

日
1-31

*

月
1-12

*

星期
0-6

分钟

小时

日

月

星期

0 9 * * 1-5

常用预设

每分钟

每小时

每天午夜

每周日午夜

每月1日午夜

工作日上午9点

每5分钟

每10分钟

每30分钟

每天0点和12点

语法参考

符号	含义	示例
*	任意值	* * * * *
,	列表分隔	1,15 * * * *
-	范围	1-5 * * * *
/	步长	*/5 * * * *

How to Use

Expression Mode

Enter a Cron expression directly, and the tool will validate it in real-time, showing:

• Whether the expression is valid
• Human-readable execution description
• Next 10 execution times

Visual Builder

Select values for each field using dropdown menus to automatically generate the corresponding Cron expression.

Cron Expression Format

A standard Cron expression consists of 5 fields:

┌───────────── minute (0 - 59)
│ ┌───────────── hour (0 - 23)
│ │ ┌───────────── day of month (1 - 31)
│ │ │ ┌───────────── month (1 - 12)
│ │ │ │ ┌───────────── day of week (0 - 6, 0 = Sunday)
│ │ │ │ │
* * * * *

Common Examples

Expression	Description
* * * * *	Every minute
0 * * * *	Every hour on the hour
0 0 * * *	Every day at midnight
0 9 * * 1-5	Weekdays at 9 AM
*/5 * * * *	Every 5 minutes
0 0 1 * *	1st of every month at midnight
0 0 * * 0	Every Sunday at midnight

MCP Service

This tool is integrated into the Gongju.dev MCP service. AI assistants can call it directly:

• cron_parse - Parse Cron expression, get description and next execution times
• cron_build - Build Cron expression from field values

See Toolbox MCP Service for details.