https://docs.angularjs.org/api/ng/type/ngModel.NgModelController

moduleUIOnline.directive('setCurrentTime', function() {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function(scope, element, attrs, ngModel) {
                var currTime = moment().format('DD.MM.YYYY HH:mm:ss');
                element.val(currTime);
                ngModel.$setViewValue(currTime);
                ngModel.$render();


                ngModel.$formatters.push(function(val) {
                    console.log(4)
                    return currTime;
                });
        }
    };
});