javascript - how to calculate the duration of year when user entered the date in textbox -

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how display duration?when dated entered in textbox,in next field total number of years(duration). example: if user entered 09/11/2015.it should displayed 0.5 value,by comparing today's date. `now use script script 

function cal()  {     obj = document.getelementbyid("date");          if (obj != null) {              if (obj.value != "") {                  var year = obj.value.split("/")[2];                  var today = new date();                  if (year > today.getfullyear()) {                      alert("invalid year");                      document.getelementbyid("date").value = "";                      document.getelementbyid("year").value = "";                  }                  else {                            document .getelementbyid("year").value = today.getfullyear() - year;                 } }              }  }

`

function aa(){  var oneday = 24*60*60*1000; // hours*minutes*seconds*milliseconds  var firstdate = new date(2016,04,12);  var seconddate = new date(2016,04,25);    var diffdays = math.round(math.abs((firstdate.gettime() - seconddate.gettime())/(oneday)));    alert(diffdays+" day(s)");  //document.getelementbyid('test').innerhtml=diffdays;    }
<button onclick="aa()">  click  </button>


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