roller="DateController as dateCtrl">
   <label for="exampleInput">Pick a date in 2013:</label>
   <input type="date" id="exampleInput" name="input" ng-model="example.value"
       placeholder="yyyy-MM-dd" min="2013-01-01" max="2013-12-31" required />
   <div role="alert">
     <span class="error" ng-show="myForm.input.$error.required">
         Required!</span>
     <span class="error" ng-show="myForm.input.$error.date">
         Not a valid date!</span>
    </div>
    <tt>value = {{example.value | date: "y