Angular.js Service

HTML

<div ng-app="myApp">
  <div ng-controller="farmController">
      <div>{{ cTime | dateFormat }}
    </div>
  </div>
</div>

JavaScript

var myApp = angular.module('myApp', []);

myApp.controller("farmController",function($scope){
    $scope.cTime = 1439396762286;   
})

myApp.service('formatting', function() {

	  var getDateFormat = function(){
	      return 'medium'
	  };

	  return {
	    getDateFormat : getDateFormat
	  };

	});


myApp.filter('dateFormat', function($filter, formatting) {

	   return function(date) {
	     return $filter['date'](date, formatting.getDateFormat())
	   }

	})