js 时间日期格式化代码分享

<script>
Date.prototype.format =function(format)
{
var o = {
"M+" : this.getMonth()+1, //month
"d+" : this.getDate(), //day
"h+" : this.getHours(), //hour
"m+" : this.getMinutes(), //minute
"s+" : this.getSeconds(), //second
"q+" : Math.floor((this.getMonth()+3)/3), //quarter
"S" : this.getMilliseconds() //millisecond
} // www.jb200.com
if(/(y+)/.test(format)){
format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4- RegExp.$1.length));
}
for(var k in o){
if(new RegExp("("+ k +")").test(format)){
format = format.replace(RegExp.$1,RegExp.$1.length==1? o[k] :("00"+ o[k]).substr((""+o[k]).length));
}
}
return format;
}

var addNDays=function(date,n){
var d = new Date(Date.parse(date.replace(/-/g,"/"))); 
var time=d.getTime();
var newTime=time+n*24*60*60*1000;
return new Date(newTime);
};
var nd = addNDays('2013-12-27',6);
var getNewDay = nd.format('yyyy-MM-dd hh:mm:ss');
alert(getNewDay);
</script>