This macro will allow you to select any file in Mac OS X and append the current date to the end of the file name. It is all done with one keyboard shortcut and no need to get to the editing file name mode. This is very useful for versioning files if you work outside of a version control system — or if you get a lot of files with the same name (images are one I constantly add this info to).
What you need: Keyboard Maestro and Automator.
Lekcja numer 2.