Cron Expression Online Tool
Next 5 Scheduled Run Times:
Visual Generator
Tool Description
A Cron Expression is a time-based string widely used in UNIX and UNIX-like systems (such as Linux) to schedule recurring tasks (Jobs) at specific times and dates. This tool helps you easily create, parse, and validate these expressions.
Expression Structure
A standard Cron Expression consists of 5 space-separated fields, representing：
| Location | Fields | Allowed Values | Allowed Special Characters |
|---|---|---|---|
| 1 | Minute | 0-59 | * / , - |
| 2 | Hour | 0-23 | * / , - |
| 3 | Day of Month | 1-31 | * / , - ? L W |
| 4 | Month | 1-12 or JAN-DEC | * / , - |
| 5 | Day of Week | 0-7 or SUN-SAT | * / , - ? L # |
* Note: Sunday can be either 0 or 7.
Special Characters Meaning
*(*): Represents every possible value for that field. For example, in the "Hour" field, it means "every hour"./(/): Used to define a step interval. For example, `*/5` in the "Minute" field means "every 5 minutes".,(,): Used to list multiple discrete values. For example, `MON,WED,FRI` in the "Weekday" field means "on Monday, Wednesday, and Friday".-(-): Used to define a range. For example, `9-17` in the "Hour" field means "every hour from 9 AM to 5 PM".?(?): Used only in the "Day of Month" and "Day of Week" fields to mean "no specific value". It helps resolve conflicts between the two fields.