Add a duration to a moment (moment.js)

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Moment version: 2.0.0

After reading the docs, I thought this would be straight-forward (Chrome console):

var timestring1 = "2013-05-09T00:00:00Z";
var timestring2 = "2013-05-09T02:00:00Z";
var startdate = moment(timestring1);
var expected_enddate = moment(timestring2);
var returned_endate = startdate.add(moment.duration(2, 'hours'));
returned_endate == expected_enddate  // false
returned_endate  // Moment {_i: "2013-05-09T00:00:00Z", _f: "YYYY-MM-DDTHH:mm:ss Z", _l: undefined, _isUTC: false, _a: Array[7]…}

This is a trivial example, but I can’t even get it to work. I feel like I’m missing something big here, but I really don’t get it. Even this this doesn’t seem to work:

startdate.add(2, 'hours')
    // Moment {_i: "2013-05-09T00:00:00Z", _f: "YYYY-MM-DDTHH:mm:ss Z", _l: undefined, _isUTC: false, _a: Array[7]…}

Any help would be much appreciated.

Edit:
My end goal is to make an binary status chart like the one I’m working on here:
http://bl.ocks.org/phobson/5872894

As you can see, I’m currently using dummy x-values while I work through this issue.

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