Node.js posting date wrong

I'm posting a date to elasticsearch and I'n using Date.now()

var unixtime = Date.now();

I'm getting the output like this: 1373508091156

Then I use this:

var date = new Date(unixtime*1000);

The output now is this:

Thu Sep 27 45494 05:19:16 GMT-0400 (EDT)

I'm not sure why I'm getting this is really wrong date :/