convert mm/dd/yyyy to dd/mm/yyyy using javascript while adding Number of days with a Date -

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this question has answer here:

i want add number of days particular date. have done problem works mm/dd/yyyy format. want work dd/mm/yyyy format. below sample code..

      <script type="text/javascript">           function datechange() {               var d = document.getelementbyid('days').value;               var mydate = new date(document.getelementbyid('date1').value);               mydate.setdate(mydate.getdate() + parseint(d));               document.getelementbyid('date2').value =  (mydate.getdate() + 1 )  + '/' + (mydate.getmonth() + 1) + '/' + (mydate.getfullyear());           }           function adddate() {               date = new date();               var month = date.getmonth() + 1;               var day = date.getdate();               var year = date.getfullyear();               if (document.getelementbyid('date1').value == '') {                   document.getelementbyid('date1').value = month + '/' + day + '/' + year;               }           }     </script>

and html code is--

   <body onload="adddate()">          <br/>          number of days add : <input type="text" id="days" onchange= "datechange()"  /> <br/> <br/>         today's date (mm / dd / yyyy) : <input type="text" id="date1" onchange="datechange()" /> <br/> <br/>          (mm / dd / yyyy) : <input type="text" id="date2" readonly/>    </body>

thanks in advance

as pointed out in comments, think there enough info on duplicate questions solve this. in case looking specific code sample, suggestion split 'mm/dd/yyyy' '/' , use date objects setmonth, setdate , setfullyear methods. 

function datechange() {   var d = document.getelementbyid('days').value;   var mydate = new date();   var d1value = document.getelementbyid('date1').value;   var ddmmyyyy = d1value.split('/');    mydate.setdate (ddmmyyyy[0]);     mydate.setmonth(ddmmyyyy[1] - 1);  // january index 0   mydate.setfullyear (ddmmyyyy[2]);    mydate.setdate(mydate.getdate() + parseint(d)); // add value of d    document.getelementbyid('date2').value =  mydate.getdate()                                    + '/' + (mydate.getmonth() + 1)                                   + '/' + mydate.getfullyear(); }

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