Angular input[type=date]. No value showed

I have issue with angular date inputs.

Example code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script>
  angular.module('app', []).controller('ACtrlr', function($scope){
    $scope.start = new Date();
    $scope.plusDay = function(s){
      console.log(s);
      $scope.start.setDate($scope.start.getDate() + 1);
    };
  });
</script>
<div ng-app="app" ng-controller="ACtrlr">
  <input type="date" ng-model="start" />
  <input type="date" ng-model="start" />
  {{start}}
  <button ng-click="plusDay(start)" >+</button>
</div>

If I change this programmaticaly(click a button first), model changes correctly, but no values in inputs presented. If I change date input immediately, model becomes simple text like 2014-12-29 and all brakes.

Earlier I used this with text values only, but now I get this exception.

Knows anybody what's wrong here? And what is correct way to work with input[type=date]s?

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Google Chrome 38.0.2125.111 (64-bit)