时间日期类型格式化

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
}

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;
}

function getTime(){
    time.innerHTML = "";
    today=new Date();
    var hours=today.getHours();
    var minutes=today.getMinutes();
    var seconds=today.getSeconds();
    var timeValue=""+hours; //+((hours>12)?hours-12:hours);
    timeValue+=(minutes<10)?(":0"+minutes+""):(":"+minutes);
    timeValue+=(seconds<10)?(":0"+seconds+""):(":"+seconds);
    function initArray() {
        this.length=initArray.arguments.length;
        for(var i=0;i<this.length;i++)
              this[i+1]=initArray.arguments[i];
    }
    var d=new initArray("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
    var datetime=("现在是"+(today.getMonth()+1)+"月"+""+today.getDate()+"日 "+timeValue+" "+d[today.getDay()+1]);
    time.innerHTML = time.innerHTML + datetime;
    setTimeout("getTime()",30);
}