Filter not filtering ng-repeat

I have a function that gets date input and turns it into time stamp.

$scope.$watch('startDate', function(timestamp) {
 $scope.timestamp = new Date($scope.startDate).getTime();      
})

I filter my array of timestamps like so:

</label> 
     <label class="item item-input">
  <span class="input-label">Date</span>
  <input type="date" ng-model="startDate" >
</label>
     </div>
<div ng-model="timestamphope">{{timestamp}}</div>          
   <div ng-repeat="x in result">
   <div ng-repeat="y in x.rates | filter:timestamp ">
       {{y[0] }}
       {{y[1]}}
   </div>

nothing happens. Can anyone help me?

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