How to store a updated date through datepicker in modal hide fade?

When I click on edit project button, modal hide fade will display project details. And I want to restore the changed date value into my item.date.sDate, but it doesn't work.

 <div class="modal hide fade" id="editdetails">
  <div class="modal-header"><h3>Update Project Information</h3></div>
  <div class="modal-body">
  <label>Project: </label>
    <input type="text" value= {{item.data.project}} class="span3" id="appendedDropdownButton" ng-model="item.data.project"><br>
  <label>Start Date: </label>
    <input type="text" value= {{item.data.sDate}} class="span3" id="datepicker1" ng-model="item.data.sDate"><br>
  <label>End Date: </label>
    <input type="text" value= {{item.data.eDate}} class="span3" id="datepicker2" ng-model="item.data.eDate"><br>
   </div>
    <br>
    <div class="modal-footer">
        <a href="#" class="btn close_btn" data-dismiss="modal">Close</a>
        <a href="#" class="btn btn-primary save_btn" ng-click="update(item.id)">Save Changes</a>
    </div>
  </div>

Javascript about datepickers, they change date to text. 

  $( "#datepicker1" ).datepicker({
               inline: true,
               dateFormat: 'dd/mm/yy',
               onSelect: function(dateText) {
                   $("#datepicker2").datepicker("option","minDate", dateText)
                   var modelPath = $(this).attr('ng-model');
                   putObject(modelPath, $scope, dateText);
                   $scope.$apply();
                }
});

$( "#datepicker2" ).datepicker({
               inline: true,
               dateFormat: 'dd/mm/yy',

               onSelect: function(dateText) {
                   $("#datepicker1").datepicker("option","maxDate", dateText)
                   var modelPath = $(this).attr('ng-model');
                   putObject(modelPath, $scope, dateText);
                   $scope.$apply();
               }
});

You should be using a directive to set up your datepicker. Fortunately, Angular-UI has done that for you.

<div ng-controller="MyCtrl">
    <input ng-model="date" ui-date ng-change="dateChanged()"/><br/>
     Selected Date: {{date | date: 'MMM d yyyy'}}
</div>

Then in your controller:

app.controller('MyCtrl', function($scope){ 
    $scope.dateChanged = function (){
        console.log('Date is: ' + $scope.date);
    };
});