Is the Javascript date object always one day off?

In my Java Script app I have the date stored in a format like so:

2011-09-24

Now when I try using the above value to create a new Date object (so I can retrieve the date in a different format), the date always comes back one day off. See below:

var date = new Date("2011-09-24");
console.log(date);

logs:

Fri Sep 23 2011 20:00:00 GMT-0400 (Eastern Daylight Time)