jQuery Datepicker com AngularJs

Esta diretiva ajuda a usar o datepicker jQuery com angualrJs. Além disso (opcionalmente), preciso comparar com alguma data. (se a data não for fornecida em comparação com a data de hoje.

app.directive('ngDate', function() {
    return {
        restrict: 'A',
        require : 'ngModel',
        link : function (scope, element, attrs, ctrl) {
                element.datepicker({
                changeYear:true,
            changeMonth:true,
                    dateFormat:'dd/M/yy',
                    onSelect:function (date) {
                        ctrl.$setViewValue(date);
            if (attrs.hasOwnAttribute('futureDate'))
            {
                var dateToCompare=scope.$eval(attrs.futureDate);
                if (!dateToCompare) dateToCompare=new Date();
                (date>dateToCompare)?ctrl.$setValidity('future',true):ctrl.$setValidity('future',false);
            }
                        scope.$apply();
                    }
                });
        }
    }; 
});

<input type='text' data-ng-model='some.DateField' data-ng-date='' data-futurDate='some.DateToCompare' name='dateControl' readonly='readonly'> 

<div class='error' data-ng-show='testForm.dateControl.$error.future'>
Date cannot be greater than some date.
</div>