Nodejs Utililty Methods Month Add

Date.prototype.addMonth = function(){
  this.setMonth(this.getMonth() + 1);
};

Date.prototype.addMonth = function () {
  var date = new Date(this.valueOf());
  date.setMonth(date.getMonth() + 1);
  return date;
};

Date.prototype.addMonth = function addMonth () {
  this.setDate(1);
  this.setHours(0);
  this.setMinutes(0);
  this.setSeconds(0);
  this.setMonth(this.getMonth() + 1);
};

Date.prototype.addMonths = function(m) {
  var d = this.getDate();
  this.setMonth(this.getMonth() + m);
  if (this.getDate() < d)
    this.setDate(0);
};

Date.prototype.addMonths = function(months){
  return new Date(this.getTime() + months*this.getDaysInMonthOfYear()*24*60*60*1000);

Date.prototype.addMonths = function(months) {
  var n = this.getDate();
  this.setDate(1);
  this.setMonth(this.getMonth() + months);
  this.setDate(Math.min(n, this.getDaysInMonth()));
  return this;
};

Date.prototype.addMonths = function (number) {
    var date = new Date(this);
    date.setMonth(date.getMonth() + number);
    return date;
};

Date.prototype.addMonths = function(value) {
  var date = this.getDate();
  this.setMonth(this.getMonth() + value);
  if (this.getDate() < date) {
    this.setDate(0);
  return this;
};

Date.prototype.addMonths = function (value)
    var n = this.getDate();
    this.setDate(1);
    this.setMonth(this.getMonth() + value);
    this.setDate(Math.min(n, this.getDaysInMonth()));
    return this;
};