title: Datediff function adds startdate day also to the output
body: <p>I have a report in Report Builder 1.0 wherein I have written a formula that calculates the number of days between startdate and enddate. For that I have used a <code>DATEDIFF</code> function in such a manner:</p>
  
  <pre><code>DATEDIFF(DAY, TODAY(), column from table which has end date)
  </code></pre>
  
  <p>Suppose, if today's date is  <code>1 July 2013</code>  &amp; the column is sending end date as <code>10 July 2013</code>, then the <code>DATEDIFF</code> function is returning "10 days" whereas it should return output as value "9 days". Why is it returning 10 days rather than 9?</p>