You type in

date

on your linx box and you get

Tue Sep 5 5:08:49 PM CDT 2023

but you want it to read

Tue Sep 5 17:08:49 CDT 2023

To make that happen execute

 localectl set-locale LC_TIME="C.UTF-8"

Log off, then log back on for it to take effect

Tested on Fedora 38-44, Rocky 9, RedHat 9