The clock of your panel is a very handy and customizable tool. You can make it show whatever you want with a few single steps, using codes called strftime. You don’t need to memorize them all, just use the ones you need, copy and paste. That easy.
First step: choose the codes. The most easy solution is going to the strftime website and pick those needed. When finished just copy the above chain (ctrl+c).
Second step: right-click on the clock and choose “Digital clock settings”:
Third step: paste (ctrl+v) it at “Clock format” and close.
Now you have your own custom clock!