How to change the system default date format to ISO 8601?

[Bo Berglund]

I have two Ubuntu Servers, one is 20.04 LTS and the other is 22.04 LTS.

Both of them are set to Swedish time zone, but when I look at log files the
timestamps are almost unreadable for me looking like this:

Mon Feb  5 09:42:42 2024

How can I change this stupid way of showing timestamps to instead be like
ISO-8601:

2024-02-05 09:42:42

Then it will be clearly readable and it will sort in a sensible way.

Note: I have read posts online which deal with changes to $HOME/.bashrc and
similar but that does not help since the logs are written by services which do
not read the user's .bashrc.

My setting must be system-wide to work properly.


-- 
Bo Berglund
Developer in Sweden