js时间戳怎么转化为日期格式

<script>
function getLocalTime(nS) {
return new Date(parseInt(nS) * 1000).toLocaleString().replace(/:\d{1,2}$/,' ');
}
alert(getLocalTime(1293072805));
</script>

<script>
function getLocalTime(nS) {
return new Date(parseInt(nS) * 1000).toLocaleString().substr(0,17)}
alert(getLocalTime(1293072805));
</script>

<script>
function getLocalTime(nS) {
return new Date(parseInt(nS) * 1000).toLocaleString().replace(/年|月/g, "-").replace(/日/g, " ");
}
alert(getLocalTime(1177824835));
</script>

function   formatDate(now)   {
var   year=now.getYear();
var   month=now.getMonth()+1;
var   date=now.getDate();
var   hour=now.getHours();
var   minute=now.getMinutes();
var   second=now.getSeconds();
return   year+"-"+month+"-"+date+"   "+hour+":"+minute+":"+second;
}

var   d=new   Date(1230999938);
alert(formatDate(d));