js中格式化日期时间型数据

var newDt=new Date(dt.replace("-","/"));

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 fmtDt=newDt.format("yyyy-MM-dd");

var fmtDt=Convert.ToDateTime(dt).ToString("yyyy-MM-dd");