First ever javascript...creates time until specified date/time in dd:hh:mm:ss format. Codegolf it please?

countdownbegin.js

var d = new Date();
d.setHours(d.getHours()-d.getTimezoneOffset()/60);
var T2 = Date.UTC(2011,9,13,7,1);
var diff=new Date();
diff.setTime(T2-d);

var days = diff.getDate() < 10 ? "0" + diff.getDate() : diff.getDate();
var hours = diff.getHours() < 10 ? "0" + diff.getHours() : diff.getHours();
var min = diff.getMinutes() < 10 ? "0" + diff.getMinutes() : diff.getMinutes();
var sec = diff.getSeconds() < 10 ? "0" + diff.getSeconds() : diff.getSeconds();
var start = days + ":"+hours+":"+min+":"+sec;


console.log(start);