js判断日期是不是合法日期

 
var end_time=$('#id_end_time').val();
 
  if(end_time==''){
 
     alert('有效截止时间不能为空!');
 
      return false;
 
      } else{
 
var matchArray=end_time.match(/^([0-9]{4})-([0-1][0-9])-([0-3][0-9])$/);
 
if(matchArray==null){
 
alert("Invalid date: " + end_time);
 
return false;
 
}else{
 
if(!isdate(matchArray[1],matchArray[2],matchArray[3])){
 
alert("Invalid date: " + end_time);
 
return false;
 
}
 
}
 
}
 
function isdate(intYear,intMonth,intDay){
 
if(isNaN(intYear)||isNaN(intMonth)||isNaN(intDay)) return false;
 
if(intMonth>12||intMonth<1) return false;
 
if ( intDay<1||intDay>31)return false;
 
if((intMonth==4||intMonth==6||intMonth==9||intMonth==11)&&(intDay>30)) return false;
 
if(intMonth==2){
 
if(intDay>29) return false;
 
if((((intYear%100==0)&&(intYear%400!=0))||(intYear%4!=0))&&(intDay>28))return false;
 
}
 
return true;
 
}
 

function check(date){
        return (new Date(date).getDate()==date.substring(date.length-2));
 }