Here you can find the source of addSecond()
Date.prototype.addSecond = function(){ this.setTime(this.getTime() + 1000);//from w w w.j a v a 2 s .co m };
Date.prototype.addSecond = function addSecond () {
this.setSeconds(this.getSeconds() + 1);
};
Date.prototype.addSeconds= function(s){ this.setSeconds(this.getSeconds()+s); return this; console.log(new Date().addHours(4).addMinutes(4).addSeconds(4));
Date.prototype.addSeconds = function (secs) { var dat = new Date(0); dat.setMilliseconds(this.getTime() + (secs * 1000)); return dat; };