SQL Agent Last Modified explanation

Question: I have a SQL Agent job with a Last modified date of  : 1/11/23.   What activity causes the last modified date to occur ? And also is there a way to find out the change?

I've used this query to identify the jobs and owners 

use msdb
go
select j.name, j.date_modified, l.loginname
from sysjobs j
inner join sys.syslogins l on j.owner_sid = l.sid

Answer: Every time the "Save As " button is clicked the date_modified column changes . This means any aspect of the SQL Agent job changed will cause the Last Modified data to change.

This does make it difficult to Audit . You would need to develop an SERVER AUDIT process to monitor the changes made , store them in a log file . One method to audit and maintain records of SQL Agent Job Changeds  is Extended Events 

Useful Links to problems solved using Extended Events 

How to capture query errors using SQL Server Extended Events

How to Audit user DML with SQL Server Extended Events

How to capture deadlocks using system_health Extended Events