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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
  <script>
    function getDates(dateStart, dateEnd) {
      var currentDate = dateStart,
          dates = [];
      while(currentDate <= dateEnd) {
        
        // append date to array
        dates.push(currentDate);
        
        // add one day
        // automatically rolling over to next month
        var d = new Date(currentDate.valueOf());
        d.setDate(d.getDate() + 1);
        currentDate = d;
        
      }
      return dates;
    }
    
    function filterWeekDays(dates, includeDays) {
      var weekdays = [];
      
      // cycle dates
      dates.forEach(function(day){
        
        // cycle days to be included (so==0, mo==1, etc.)
        includeDays.forEach(function(include) {
          if(day.getDay() == include) {
            weekdays.push(day);
          }
        });
      });
      return weekdays;
    }
    </script>
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <script>
    var dates = getDates(new Date("August 01, 2010 11:13:00"),
                              new Date("Sept 30, 2010 11:13:00")),
        workDays = filterWeekDays(dates, [5]);
    document.writeln(dates.length + " days total<br/>");
    document.writeln(workDays.length + " weekdays");
  </script>
</body>
</html>
 
​
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