Дата момента добавить
var new_date = moment(startdate, "DD-MM-YYYY").add(5, 'days');
Attractive Addax
var new_date = moment(startdate, "DD-MM-YYYY").add(5, 'days');var date = "2017-03-13";
var time = "18:00";
var timeAndDate = moment(date + ' ' + time);
console.log(timeAndDate);