The broad, all-encompasing response to your clock (and to a certain extent popup) question is: rtfm (well, I don't like that abbreviation but it applies).

Themes are made up of modules which province commands and settings - and incertain cases objects - to the user. A clock is usually just a label (or more recently an "xLabel"). All you need to do is find the lines in your theme's .rc files (located usually in /Litestep/profiles/dcazman/themes/themename) which configure the look of your clock "label" and change them to the way you want.

First thing to do is find out what module is doing your clock for you (look in your theme.rc file for a line starting with *NetLoadModule and followed by either "label-x.x.x" or "xLabel-x.x.x" with the x.x.x being a version number), then look in your /litestep/modules/docs folder for that modules docs, then rtfm and enjoy :D

That's how you learn litestep basically. Take apart someone else's theme and understand the modules they used and why.

Good luck :D