js 与 php 时间戳的区别（毫秒与秒的计算方式）

//距离时间的时间戳
var suoshengshijian = <?php echo $expire_time_unix ; ?>;
//当前时间的时间戳
var timestamp = Date.parse(new Date()) / 1000; 
//倒计时函数
var getTime = function() 
{
    var nowTime = new Date();
    var endTime = new Date(suoshengshijian * 1000);
    var ms = endTime.getTime() - nowTime.getTime();
    var day = Math.floor(ms / (1000 * 60 * 60 * 24));
    var hour = Math.floor(ms / (1000 * 60 * 60)) % 24;
    var minute = Math.floor(ms / (1000 * 60)) % 60;
    var second = Math.floor(ms / 1000) % 60;
    ms = Math.floor(ms / 100) % 10;
    if (second > 0)   
    {
        document.getElementById("suoshengshijian").innerHTML = hour + "小时 " + minute + "分 " + second + " 秒"
    } else {
        window.location.reload();
        return false;
    }
    setTimeout("getTime()", 1000);
}