好用的js時間format

<script type="text/javascript"> 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; }

var now = new Date(); var nowStr = now.format("yyyy-MM-dd");

onload=function(){ df=document.form.DateFrom; dt=document.form.DateTo;

if(df.value=="")  df.value=nowStr; if(dt.value=="")  dt.value=nowStr;  }

</script>