当前位置：网站首页>Corn expression usage

Corn expression usage

2022-07-21 20:06:00 【adadapter】

sketch

Cron An expression is a string with time meaning , String to 5~6 Space between , It is divided into 6~7 Domains , The format is X X X X X X. among X Is a placeholder for a field . The last field representing the year is not required , It can be omitted . When a single field has multiple values , Use half angle commas , Interval value . Each field can be a definite value , It can also be a special character with logical meaning , Each domain supports at most one leading zero . for example

 Appoint  2022  Every morning in  8:15  Perform tasks ,Cron  The expression can be specified as  `0 15 8 ? * * 2022` perhaps 
  `0 15 08 ? * * 2022`, But it cannot be specified as `0 15 008 ? * * 2022`

Field value and character usage

Domain	Is it necessary to	Value range	Special characters
second	yes	[0, 59]	* , - /
minute	yes	[0, 59]	* , - /
Hours	yes	[0, 23]	* , - /
date	yes	[1, 31]	* , - / ? L W
month	yes	[1, 12] or [JAN, DEC]	* , - /
week	yes	[1, 7] or [MON, SUN]. If you are using [1, 7] The way of expression ,`1` On behalf of Monday ,`7` On behalf of Sunday .	* , - / ? L #
year	no	[ Current year ,2099]	* , - /

Usage examples

Example	explain
`0 15 10 ? * *`	Every morning 10:15 Perform tasks
`0 15 10 * * ?`	Every morning 10:15 Perform tasks
`0 0 12 * * ?`	Every day at noon 12:00 Perform tasks
`0 0 10,14,16 * * ?`	Every morning 10:00 spot 、 Afternoon 14:00 And in the afternoon 16:00 Perform tasks
`0 0/30 9-17 * * ?`	Every morning 09:00 In the afternoon 17:00 Perform the task every half an hour during the time period
`0 * 14 * * ?`	Every afternoon 14:00 In the afternoon 14:59 Every 1 Minutes to perform the task
`0 0-5 14 * * ?`	Every afternoon 14:00 In the afternoon 14:05 Every 1 Minutes to perform the task
`0 0/5 14 * * ?`	Every afternoon 14:00 In the afternoon 14:55 Every 5 Minutes to perform the task
`0 0/5 14,18 * * ?`	Every afternoon 14:00 In the afternoon 14:55、 Afternoon 18:00 In the afternoon 18:55 Every 5 Minutes to perform the task
`0 0 12 ? * WED`	Every Wednesday at noon 12:00 Perform tasks
`0 15 10 15 * ?`	monthly 15 The morning of 10:15 Perform tasks
`0 15 10 L * ?`	On the morning of the last day of each month 10:15 Perform tasks
`0 15 10 ? * 6L`	On the morning of the last Saturday of each month 10:15 Perform tasks
`0 15 10 ? * 6#3`	On the morning of the third Saturday of each month 10:15 Perform tasks
`0 10,44 14 ? 3 WED`	Every year, 3 Every Wednesday afternoon of the month 14:10 and 14:44 Perform tasks
`0 15 10 ? * * 2022`	2022 Every morning in 10:15 Perform tasks
`0 15 10 ? * * *`	Every morning every year 10:15 Perform tasks
`0 0/5 14,18 * * ? 2022`	2022 Every afternoon in 14:00 In the afternoon 14:55、 Afternoon 18:00 In the afternoon 18:55 Every 5 Minutes to perform the task
`0 15 10 ? * 6#3 2022,2023`	2022 - 2023 On the morning of the third Saturday of each month 10:15 Perform tasks
`0 0/30 9-17 * * ? 2022-2025`	2022 - 2025 Every morning in 09:00 In the afternoon 17:30 Perform the task every half an hour during the time period
`0 10,44 14 ? 3 WED 2022/2`	from 2022 Year begins , Every two years 3 Every Wednesday afternoon of the month 14:10 and 14:44 Perform tasks