title: DateTime diff in excel (millisecond accuracy)
body: <p>I have some data in csv file:</p>
  
  <p><code>21-05-2012 15:41:49.354 | 21-05-2012 15:41:54.376|</code></p>
  
  <p>their format is <code>general</code></p>
  
  <p>how can I calculate in excel the dateTime diff between the two columns?</p>
  
  <p>(millisecond accuracy is required)</p>