Adding a timestamp

Found the following snippet of code on www.bjclark.com/code/my.emacs.html, to insert a timestamp string at the current point. Wonderful things, Google and Emacs. (Although I'm surprised that something this simple wasn't a stock part of Emacs...).

(defun insert-date ()

  "Insert current date and time."

  (interactive "*")

  (insert (current-time-string)))