Time Manipulation with DateJS

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/datejs/1.0/date.min.js"></script>
Start Time: <input id="startTime" type="text" /><br />
End Time: <input id="endTime" type="text" />
    <div id="output">
    
    </div>
    <div id="test">
    
    </div>

JavaScript

$(function () {
    $("#startTime").change(function () {
    	var st = Date.parse(this.value);
      var et = Date.parse(this.value).add(3*7+4).days();
       $("#endTime").val(et.toString("MM/dd/yyyy"));
       updateWeeks(st,et);
       
       
    });

    
    function updateWeeks(start, end)
{
  var cd = start;
  var sd = start;
  var ed = end;
  var tststart = cd.getDay();

  if(tststart > 1)
  {
  	cd.setDate(cd.getDate() - (tststart-1));
  }
  var cw;
  var msg = "UAT:: <br>";
  var out = "<table><tr><th>&nbsp;</th><th>Mon</th><th>Tue</th><th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th><th>Sun</th>";
  while (cd <= ed)
  {
  	var curd = cd.getDay();
    var curw = cd.getWeek();
    if(curw != cw)
    {
    	out = out + "</tr><tr><td>Week " + curw + "</td>";
      cw = curw;
    }
    if(curd>0 && curd <=5)
    {
    	if(cd >= start)
      {
    		out = out + "<td><b>" + cd.toString("MM/dd") + ">" + sd.toString("MM/dd") + "</b></td>";
      }
      else
      {
      	out = out + "<td><i>" + cd.toString("MM/dd") + "</i></td>";
      }
    }
    else
    {
    	out = out + "<td>" + cd.toString("MM/dd") + "</td>";
    }
  	
    cd = cd + 1;
  }
	out = out + "</tr></table>";
  msg = msg + "start " + start + " to " + end + "<hr>" + out;
  
  $("#output").html(msg);
}

});