cmd line rename file with date and time

Question

Project moving forwards, I can see why creating .bat files to do things can become addictive! I can now save somefile.txt at regular intervals, I then rename somefile.txt by

Answer 1

ls | xargs -I % mv % %_`date +%d%b%Y`

One line is enough. ls all files/dirs under current dir and append date to each file.