title: Calculating timespan with t-sql
body: <p>Given two date/times:</p>
  
  <pre><code>@start_date = '2009-04-15 10:24:00.000'
  @end_date = '2009-04-16 19:43:01.000'
  </code></pre>
  
  <p>Is it possible to calculate the time elapsed between the two dates in the following format</p>
  
  <p>1d 9h 19m</p>