在jquery datepicker中的onselectiong日期，我需要在表单文本字段中获取日期和月份

on selecting date, it has to display day name like Sunday,Monday and month name like January,February in other fields.

thanks in advance,

here is my html code

<input type="text" id="datepicker" class="form-control"></p>

<input type="text" id="day" class="form-control"></p>
<input type="text" id="month" class="form-control"></p>

here is my js

<script>
    $( "#datepicker" ).datepicker({dateFormat: 'dd-mm-yy'});
    $('#btn').click(function(){
         var _myDate = new Date($('#datepicker').datepicker("option" , 
"dateFormat", "mm-dd-yy").val());
         var monthNames = ["January", "February", "March", "April", "May", 
 "June","July", "August", "September", "October", "November", "December"];

          $('#my_month').val(monthNames[_myDate.getMonth()]);
          $('#my_day').val(_myDate.getDay());
    });
    </script>

$( function() {
var weekday=new Array(7);
weekday[0]="Sunday";
weekday[1]="Monday";
weekday[2]="Tuesday";
weekday[3]="Wednesday";
weekday[4]="Thursday";
weekday[5]="Friday";
weekday[6]="Saturday";

        $( "#datepicker" ).datepicker({
            dateFormat: 'mm-dd-yy',
            inline: true,
            onSelect: function(dateText, inst) {
                var date = $(this).datepicker('getDate'),
                    day  = date.getDate(),
                    month = date.getMonth() + 1,
                    year =  date.getFullYear();
 var dayOfWeek = weekday[date.getUTCDay()+1];
                $("#day").val(dayOfWeek);
                $("#month").val(month);
            }

        });

    } );

<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>


<input type="text" id="datepicker" class="form-control">

<input type="text" id="day" class="form-control">
<input type="text" id="month" class="form-control">

</div>