Angular Testbed

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.0/angular.js"></script>
<body ng-app="app">
    <div ng-model='testDate' unix-timestamp > 
        {{testDate}}
    </div>
</body>

JavaScript

angular.module('app', [])
    .run(function ($rootScope, $timeout) {
    $rootScope.testDate = 12867053213;

    $timeout(function () {
        $rootScope.testDate = 1286705410;
    }, 1000);
})
    .directive('unixTimestamp', function () {
        return {
            require: 'ngModel',
            priority: 1,
            link: function (scope, element, attr, ngModelCtrl) {
                ngModelCtrl.$formatters.push(function (timestamp) {
                    if (timestamp) {
                        var date = moment.unix(timestamp).toDate();
                        return date;
                    } else {
                        return null;
                    }
                });
                ngModelCtrl.$parsers.push(function (date) {
                    if (date) {
                        var timestamp = moment(date).unix();
                        return timestamp;
                    } else {
                        return null;
                    }
                });
            }
        };
    })
});