Cron 解析与执行时间线6 分钟阅读最后更新于
Cron 任务调度与表达式语法：5字段标准与执行时间线
轻松解析 Cron 表达式，将复杂的定时规则转换为清晰易懂的文字描述，并查看未来 5 次执行时间。
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核心要点
- 标准 Cron 表达式包含 5 个字段：分钟(0-59)、小时(0-23)、日(1-31)、月(1-12)、星期(0-6)。
- 星号(*)代表任意有效值，步进语法(*/n)表示每隔 n 个单位执行一次。
- 连字符(-)定义连续范围，逗号(,)用于指定离散列表。
- 在部署到生产服务器前，务必预先验证未来的实际执行时间点。
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解析与可视化 Cron 定时表达式
快速校验 Cron 语法，分解各个时间字段，即时查看即将触发的执行时间表。
- 5-field breakdown cards
- Human-language schedule translation
- Next 5 execution dates calculation
- Quick presets library
01.Anatomy of a Cron Expression: The 5-Field Standard
Originally created for Unix crontab, the standard 5-field format maps to: [minute] [hour] [day-of-month] [month] [day-of-week]. For example, 0 9 * * 1-5 represents "At 09:00 AM, Monday through Friday".
02.Calculating Next Execution Timestamps & Edge Cases
Computing future run dates requires simulating date increments while matching all five constraint sets. Special care is taken for months with fewer than 31 days and leap years to guarantee accurate schedule forecasting.
How to Parse and Build Cron Schedules
Step-by-step cron expression creation.
1
Enter Cron Expression
Type a 5-field expression into the input field or click a quick preset (e.g., Every Hour, Daily Midnight).
2
Read Human Translation
Review the plain-language schedule description generated automatically.
3
Check 5-Field Breakdown
Inspect individual cards for Minute, Hour, Day of Month, Month, and Day of Week.
4
Review Next 5 Run Dates
Check the upcoming execution timeline in UTC and local timezone timestamps.
Frequently Asked Questions
It runs every 5 minutes (at minutes 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55).