Nodejs Utililty Methods Hour Add

Date.prototype.addHours = function(hours) {
    this.setHours(this.getHours() + hours);
    return this;
};

Date.prototype.addHours = function(n) { this.setHours(this.getHours() + n) }

Date.prototype.addHours = function (numberOfHours) {
  if (typeof numberOfHours !== 'number')
    throw new Error('Hours must be a number');
  this.setTime(this.getTime() + (numberOfHours * 60 * 60 * 1000));
  return this;
};

Date.prototype.addHours = function (numberOfHours) {
  if (typeof numberOfHours !== 'number')
    throw new Error('Hours must be a number');
  this.setTime(this.getTime() + (numberOfHours * 60 * 60 * 1000));
  return this;
};
var str = '    something    else  ';
var r = str.toTitleCase();

Date.prototype.AddHours = function (hours) {
  return this.setHours(this.getHours() + hours);
Date.prototype.Format = function (fmt) {
  var o = {
    "M+": this.getMonth() + 1,
    "d+": this.getDate(),
    "h+": this.getHours(),
    "m+": this.getMinutes(),
...