更改组件中的过滤器参数后未应用过滤器

Question

我被阻止了角度双向绑定和过滤器的问题。我使用参数过滤器，并在另一个指令中更改参数值后，不应用过滤器。以下是代码的一部分：

  <div class="col-md-offset-4 col-md-4">
   <calendar-select ng-model="dailyTimekeepingCtrl.selectedDay">   </calendar-select>
  </div>
.......
   <work-timekeepings-day timekeepings="dailyTimekeepingCtrl.timekeepingList" 
            day="dailyTimekeepingCtrl.selectedDay"></work-timekeepings-day>

组件定义：

var workTimekeepingsDay = TimekeepingsApp.component('workTimekeepingsDay', {
    templateUrl : 'angular/components/work-timekeepings-day.html',
    controllerAs: '$workTkDayCtrl',
    bindToController: true,
    controller: function() {
        this.isTkCollapsed = true;
        this.workTimekeepingTemplate='angular/popups/work-timekeeping-popup.html';
    },
    bindings : {
        timekeepings : '=',
        day: '='
    }
});

组件模板：

<p> {{($workTkDayCtrl.timekeepings | workTimekeeping : $workTkDayCtrl.day).length }} </p>
<p> {{$workTkDayCtrl.day | amDateFormat:'DD MM YYYY'}}</p>

dailyTimekeepingCtrl.selectedDay使用指令进行更改，与其双向绑定：

var calendarSelect = TimekeepingsApp.directive('calendarSelect', ['$timeout', function($timeout) {
return {
    restrict : 'E',
    scope : {
        calendarDate : '=ngModel'
    },
    templateUrl : 'angular/calendar-select.html',
    link: function (scope, element, attrs) {
            scope.dayUp = function() {
                       scope.calendarDate.add(1, 'days');
             };
        ...................

第一次触发时，会正确应用过滤器。在父页面/控制器中更改dailyTimekeepingCtrl.selectedDay后，正确应用了day绑定变量。但结果不会被新值过滤。谁能暗示我做错了什么？ 感谢。