js 포맷 날짜 및 날짜 비교

Date.prototype.pattern=function(fmt) {        
    var o = {        
    "M+" : this.getMonth()+1, //         
    "d+" : this.getDate(), //         
    "h+" : this.getHours()%12 == 0 ? 12 : this.getHours()%12, //         
    "H+" : this.getHours(), //         
    "m+" : this.getMinutes(), //         
    "s+" : this.getSeconds(), //         
    "q+" : Math.floor((this.getMonth()+3)/3), //         
    "S" : this.getMilliseconds() //         
    };        
    var week = {        
    "0" : "\u65e5",        
    "1" : "\u4e00",        
    "2" : "\u4e8c",        
    "3" : "\u4e09",        
    "4" : "\u56db",        
    "5" : "\u4e94",        
    "6" : "\u516d"       
    };        
    if(/(y+)/.test(fmt)){        
        fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));        
    }        
    if(/(E+)/.test(fmt)){        
        fmt=fmt.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "\u661f\u671f" : "\u5468") : "")+week[this.getDay()+""]);        
    }        
    for(var k in o){        
        if(new RegExp("("+ k +")").test(fmt)){        
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));        
        }        
    }        
    return fmt;        
}      
    
var date = new Date();     
window.alert(date.pattern("yyyy-MM-dd hh:mm:ss"));  

function checkTime(date){
	   
	    try{
	     // var timeNow=new Date().format('yyyy-MM-dd hh:mm:ss');
	     var timeNow=new Date().pattern('yyyy-MM-dd hh:mm:ss');
	    }catch(err){
	       alert(err);
	    }
	      var beginTime = timeNow;
          var endTime =date;
          var beginTimes=beginTime.substring(0,10).split('-');
          var endTimes=endTime.substring(0,10).split('-');
          beginTime=beginTimes[1]+'-'+beginTimes[2]+'-'+beginTimes[0]+' '+beginTime.substring(10,19);
          endTime=endTimes[1]+'-'+endTimes[2]+'-'+endTimes[0]+' '+endTime.substring(10,19);
         
         var a =(Date.parse(endTime)-Date.parse(beginTime))/3600/1000;
        if(a<0){
           
             return false;
        }else if (a>0){
            
             return true;
       }else {
         return 'exception';
       }
}