title: Stored Procedure in datediff
body: <p>Couldn't execute stored proc. in date diff</p>
  
  <pre><code>    SELECT DATEDIFF(DAY,'2012-11-23',(exec AddValorDate 3,'2012-11-26'))
      Msg 156, Level 15, State 1, Line 1
      Incorrect syntax near the keyword 'exec'.
      Msg 102, Level 15, State 1, Line 1
      Incorrect syntax near ')'.
  </code></pre>