title: How can I insert text to a buffer without the trailing "nil"
body: <p>I've got a function to insert the current date into my file</p>
  
  <pre><code>(defun insert-date ()
     (interactive)
     (insert 
          (format-time-string "%m-%d-%Y")))
  </code></pre>
  
  <p>This works for inserting the date into my current buffer, however the output is <code>01-24-2011nil</code></p>
  
  <p>How can I remove the nil from the input.</p>