Adding hours to JavaScript Date object?

It amazes me that JavaScript's Date object does not implement an add function of any kind. I simply want a function that can do this: var now = Date.now(); var fourHoursLater = now.addHours(4); function Date.prototype.addHours(h) { // how do I implement this? } I would simply like some pointers in a direction. - Do I need to do string parsing? - Can I use setTime? - How about milliseconds? Like this: new Date(milliseconds + 4*3600*1000 /*4 hrs in ms*/)? This seems really hackish though - and does it even work?

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