I found a solution here, someone created a js file for different formats (including UTC):
http://mvcworld.blogspot.com/2013/06/convert-json-date-to-javascript-date.html
var de_date = inv.DateEntered; //$.date(inv.DateEntered);
var d1_date = new Date(parseInt(de_date.substr(6)));
var d2_date = d1_date.format("UTC:mm/dd/yyyy");