Question 1: Why is there a cron expression with 5 arguments
There is a cron expression 0 6 * * * that uses 5 parameters
Cron expressions are divided into six or seven fields, from left to right: second minute hour day month week year Cron expressions & crontab scheduled tasks
Very confused, I searched this link to ask for a crontab time notation – V2EX
Crontab can be written in different ways, with either 5 or 6 parameters, depending on which library you are using
Answered my question. The five parameters are expressed as minute, day, month and week. 0 6 * * * indicates that tasks are executed at 6:00 p.m. every day. The CRon scheduling expression editor displays the expression meaning intuitively
The editor lists the allowable ranges and meanings of each parameter
Cron expression for 5 parameters, see:
Online Crontab expression execution time calculation – code tool
Cron expression parameter description of 6 parameters
www.cnblogs.com/sunjie9606/…
6 – parameter Cron expression editor
cron.qqe2.com/
For example, 0 */15 * * *? Run this command every 15 minutes.
Question 2: Why does the 6-parameter Cron expression week field 5L represent the Thursday of the last week of the month instead of Friday
CRON expression explanation – Ant Group fintech
The allowed values of the week range from 1 to 7:1 indicates Sunday, 2 indicates Monday, and 5 indicates Thursday