Cron 表达式解析器

解析 Cron 表达式并用中文说明调度含义，快速理解定时任务语法。

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Field order:

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

输入

输出

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示例

Example 1

* * * * *

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Example 2

0 9 * * 1-5

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Example 3

30 6 1 * *

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Example 4

*/15 * * * *

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Example 5

0 0 * * 0

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A: A string of 5 fields (minute, hour, day, month, weekday) that defines when a scheduled task runs.

A: * means "every" for that field — e.g., * in the minute field means every minute.

A: The slash notation means "every N units" — */5 in minutes means every 5 minutes.