JS 倒计时

function GetRTime() {
var EndTime = new Date('2016/03/02 10:00:00');
var NowTime = new Date();
var t = EndTime.getTime() - NowTime.getTime();
var d = 0;
var h = 0;
var m = 0;
var s = 0;
if (t >= 0) {
d = Math.floor(t / 1000 / 60 / 60 / 24);
h = Math.floor(t / 1000 / 60 / 60 % 24);
m = Math.floor(t / 1000 / 60 % 60);
s = Math.floor(t / 1000 % 60);
}

document.getElementById("t_d").innerHTML = d;
document.getElementById("t_h").innerHTML = h;
document.getElementById("t_m").innerHTML = m;
document.getElementById("t_s").innerHTML = s;
}
setInterval(GetRTime, 0);