AngularJs check if date is valid

<!DOCTYPE html>
<html lang="en">
<head>
 <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.13/angular.min.js"></script>
 <script>
var myApp = angular.module("myApp", []);
 myApp.controller("myController", function($scope) {
  $scope.result1 = '';
  $scope.result2 = '';
  $scope.dateModel = new Date();
  $scope.chackDate1 = function() {	 
    var d = new Date($scope.dateModel);
    if(angular.isDate(d)){
		$scope.result1= true;
	}else{
		$scope.result1= false;
	}
  }
  $scope.chackDate2 = function() {	 
    var d1 = "01-03-2016"; 
  // will return false as d1 is string. If you convert it to date it will give true.
    if(angular.isDate(d1)){
		$scope.result2= true;
	}else{
		$scope.result2= false;
	}
  }
});
</script>
</head>
<body>  
<div ng-app="myApp">  
<div ng-controller="myController">  
	<input type="text" ng-model="dateModel"  /><br>
    <button ng-click ="chackDate1()" >Check Date</button>
	<br>
	Result = {{result1}}<br>
  <button ng-click ="chackDate2()" >Check Date</button>
	<br>
	Result = {{result2}}
</div> 
</div>
</body>  
</html>