JAVASCRIPT

moment js add day

var new_date = moment(startdate, "DD-MM-YYYY").add(5, 'days');

moment.add

var newDate = moment().add(1, 'hours').add(10,"m");
//years or y
//quarters or Q
//months or M
//weeks or w
//days or d
//hours or h
//minutes or m
//seconds	or s
//milliseconds or ms 

moment add

moment().add(Number, String);
moment().add(Duration);
moment().add(Object);

moment add

moment([2010, 0, 31]);                  // January 31
moment([2010, 0, 31]).add(1, 'months'); // February 28