AngularJS 1.4.3 [ngModel: datefmt] Date expected

I am having problems loading date inputs via AJAX. My PHP server is returning dates from a PDO request as JSON strings like 2014-01-27. I've looked at other forum posts that tell me to convert a string to a date object:

$scope.created_time = new Date(dateString);

      

        
        
        
      

    

However, I cannot get it to work on my end. Here is my code for the conversion:

results.data.jobCreated = new Date(results.data.jobCreated);

      

        
        
        
      

    

I even checked the data to make sure it is the date of the object type:

alert(results.data.jobCreated instanceof Date);

      

        
        
        
      

    

This returns a warning with "true", but the browser console still gives me the following error:

Error: [ngModel:datefmt] Expected `2014-01-27` to be a date
http://errors.angularjs.org/1.4.3/ngModel/datefmt?p0=2014-01-27
at REGEX_STRING_REGEXP (angular.js:68)
at Array.<anonymous> (angular.js:21615)
at Object.ngModelWatch (angular.js:25159)
at Scope.$get.Scope.$digest (angular.js:15675)
at Scope.$get.Scope.$apply (angular.js:15951)
at done (angular.js:10364)
at completeRequest (angular.js:10536)
at XMLHttpRequest.requestLoaded (angular.js:10477)

      

        
        
        
      

    

If I show the code directly in the DOM with double curly braces, the following appears:

{"jobCreated":"2014-01-28T00:00:00.000Z"}

      

        
        
        
      

    

This means converting the Date object is working, but I'm not sure why Angular still doesn't accept my Date object.

Thank you for your suggestions.

I should also note that I have a directive that sets the ng-model format to "YYYY-MM-DD" so that I can also validate the date form on the PHP server:

.directive("myModelFilter", ["$filter", function($filter){
   return {
      restrict: 'A', // only activate on element attribute
      require: '?ngModel',
      link: function(scope, element, attrs, ngModelController) 
      {
        ngModelController.$parsers.push(function(data) {
          //convert data from view format to model format

            // Grab the parameters
            var params = scope.$eval(attrs.myModelFilter) ;

            // Filter with the parameters passed
            return $filter(params.filter)(data, params.expr, params.comp);

        });

        ngModelController.$formatters.push(function(data) {
            //convert data from model format to view format
            // Grab the parameters
            var params = scope.$eval(attrs.myModelFilter) ;

            // Filter with the parameters passed
            return $filter(params.filter)(data, params.expr, params.comp);
        });
      }
   };
}])

      

        
        
        
      

    

This is the HTML for the input:

<input name="jobCreated" ng-model="formData.jobCreated" required="required" type="date" placeholder="yyyy-mm-dd" my-model-filter="{filter:'date',expr:'yyyy-MM-dd'}" jquery-date-picker="{dateFormat:'yy-mm-dd'}" jquery-mask="{format:'0000-00-00',placeholder:'yyyy-mm-dd'}">