js时间戳怎么转成日期格式

<script>
function getLocalTime(nS) {     
   return new Date(parseInt(nS)).toLocaleString().replace(/:\d{1,2}$/,' ');     
}     
alert(getLocalTime(1468297800000));     
</script>

<script>
function getLocalTime(nS) {     
    return new Date(parseInt(nS)).toLocaleString().substr(0,17)}     
alert(getLocalTime(1468297800000));     
</script>

<script>
function getLocalTime(nS) {     
    return new Date(parseInt(nS)).toLocaleString().replace(/年|月/g, "-").replace(/日/g, " ");      
}     
alert(getLocalTime(1468297800000));     
</script>

<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(1468297800000);     
alert(formatDate(d));
</script>