Cron表达式生成器

格式：分钟 小时 日期 月份 星期

格式顺序: minute hour day-of-month month day-of-week

特殊字符：

• * - 任意值
• , - 值列表分隔符 (e.g., 1,3,5)
• - - 范围分隔符 (e.g., 1-5)
• / - 步长值 (e.g., */3 = every 3rd)

常用间隔示例

• • */5 in minute field = every 5 minutes
• • */3 in hour field = every 3 hours
• • 0 */6 * * * = every 6 hours at minute 0
• • 30 */4 * * * = every 4 hours at minute 30
• • 0 9,17 * * 1-5 = 9AM and 5PM on weekdays