title: DATEDIFF Getting the previous month
body: <p>I want to get the previous month relative to the current date</p>
  
  <blockquote>
    <p>SELECT datediff(mm,-1,2-2-2011)</p>
  </blockquote>
  
  <p>This query gives <strong>67</strong> which is a wrong value .. where i went wrong ?</p>