Yes, these can be changed, and I'd really appreciate it if they were standardised too. Much as I appreciate the simplicity and speed of a raw unprocessed log, and one log style does not fit all, I do wish the world of computing would at least stick to a single date style. (Anything but a US style date would work - a date/time should always be most significant to least, or the opposite. Never middle-significance, least, most - that's inarguably wrong).
The reason we get different styles is that there are three (well, more) "technologies" involved.
Jira (Atlassian) runs on Tomcat (Apache), which runs in a Java Virtual Machine (several vendors, but they tend to use the same date formats)
- The JVM is generating the GC logs
- Tomcat is generating the access and catalina logs
- You didn't mention it, but Jira is generating a pile of logs in <jira home>/log as well, and those start with "2019-09-20 00:34:41,793" - yet another one.
I don't know what to do with the GC logs, I've not delved into java enough.
Tomcat logging I have changed and I started with (an older version of) https://tomcat.apache.org/tomcat-8.5-doc/logging.html
Most Atlassian applications use log4j (although I think they're moving away from it). I've not messed with the dates in that, but I am sure you can, and it is at least all in one place - the applications that do use it all have a "log4j.properties" file somewhere.
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