Question

Where am I going wrong with this code?

var now = Date.now();
var HoursLater = now.addHours(6);
Date.prototype.addHours= function(h){
    this.setHours(this.getHours()+h);
    return this;
}

document.write(HoursLater);

​

Answer 1

No need to reinvent the wheel!

There are good libraries around which will save you alot of time.

look at date.js. it already has addHours()!

.addHours ( Number hours ) : Date

Adds the specified number of hours to this instance given the number of hours to add. The number can be positive or negative.

// Solution to your problem with date.js ;)
Date.today().addHours(6);

// What date is next thursday?
Date.today().next().thursday();

// Add 3 days to Today
Date.today().add(3).days();