title: weekdays' duration using boost date
body: <p>Is there a way to get only the no. of weekdays between 2 boost dates.</p>
  
  <p>In the following, I'm only getting calendar days. </p>
  
  <pre><code>date begin_dt(2011,Aug,3);
  date end_dt(day_clock::local_day());
  days duration=end_dt-begin_dt;
  
  std::cout&lt;&lt;"calendar days between begin &amp; end date are: "&lt;&lt;duration&lt;&lt;std::endl;
  </code></pre>