JS验证日期的格式YYYY-mm-dd

function checkInputDate(obj){
   var   strDate=obj.value;
   var  re =/^(\d{4})-(\d{2})-(\d{2})$/;
   if(re.test(strDate))//判断日期格式符合YYYY-MM-DD标准
   {
    var   dateElement=new   Date(RegExp.$1,parseInt(RegExp.$2,10)-1,RegExp.$3);
     if(!((dateElement.getFullYear()==parseInt(RegExp.$1))&&((dateElement.getMonth()+1)==parseInt(RegExp.$2,10))&&(dateElement.getDate()==parseInt(RegExp.$3))))//判断日期逻辑
     {
       document.getElementById("errorMessage").innerText = "You can only input Date.(YYYY-MM-DD) !";
       document.getElementById("error").style.display = "";
       obj.value= ' ';
      }
   }else{
    document.getElementById("errorMessage").innerText = "You can only input Date.(YYYY-MM-DD)!";
       document.getElementById("error").style.display = "";
       obj.value= ''; 
   }
 }