add days to Date

Hi All,

Has anybody ever used moment before? http://momentjs.com/

It seems like an easy way to manipulate dates.
I am trying to add days to a date I get from a sharePoint list but it's not working like I expect.
i think my syntax is wrong and I can't find anything on their site about how to do this.

function getCumuVal(dte)
{
	alert(dte);
	var nextDate = moment().add('days', 6).calendar(dte);
	alert("nxDte: "+nextDate);
}

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The first alert shows the date being passed in but then the 2nd alert shows this..
"nxDte: Thursday at 11:17 AM".
It shows that for all the dates.

When I tried it this way

var nextDate = moment(dte).add('days', 6);

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My alert produced the folllwoing: "1349841600000" but the values were different for each date


Any ideas or how I can add 6 days to any date?

Thanks!