Angular JS Time Directive

HTML

<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.2/angular.min.js"></script>
<div ng-app="time">
  <div ng-controller="Ctrl2">
      Date format: <input ng-model="format" /> <hr/>
    Current time is: <span my-current-time="format"></span>
      <div>{{propiedadPrueb}}</div>
  </div>
</div>

JavaScript

var time = angular.module('time', []);

time.controller('Ctrl2', ['$scope', function ($scope) {
  $scope.format = 'M/d/yy h:mm:ss a';
}]);

time.directive("myCurrentTime", function(dateFilter){
    return function(scope, element, attrs){
        var format;
        
        scope.$watch(attrs.myCurrentTime, function(value) {
            format = value;
            updateTime();
        });
        
        function updateTime(){
            var dt = dateFilter(new Date(), format);
            element.text(dt);
        }
        
        function updateLater() {
            setTimeout(function() {
              updateTime(); // update DOM
              updateLater(); // schedule another update
            }, 1000);
        }
        
        updateLater();
    }
});