Cron表达式构建器
使用可视化界面构建和验证cron表达式，输出可读格式
Cron Expression
0 9 * * 1-5Runs: at minute 0, at hour 9, on from Mon to Fri
Common Presets
Cron Expression Builder
Build and validate cron expressions visually. Set minute, hour, day, month, and weekday fields and get a human-readable description, next run times, and a ready-to-use cron string.
Cron syntax quick reference
Every minute
* * * * *
Every hour
0 * * * *
Every day at midnight
0 0 * * *
Every weekday at 9 AM
0 9 * * 1-5
Every 15 minutes
*/15 * * * *
First day of month
0 0 1 * *
FAQ
What is a cron job?
A cron job is a scheduled task on Unix/Linux systems. The cron daemon reads a crontab file and runs commands at specified intervals — common for backups, emails, database cleanup, and API polling.
What does * mean in cron?
An asterisk (*) means 'every possible value'. * in the hour field means 'every hour'; */2 means 'every 2 hours'.
Does cron support seconds?
Standard Unix cron uses 5 fields (minute to day-of-week) with minute-level precision. Some systems (AWS EventBridge, Spring) add a 6th field for seconds.
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