日期判断

                   

                           function getdate(dat){
    var newdate=/^/d{4}[-]/d{1,2}[-]/d{1,2}/$/;
    var r =dat.search(newdate);
    if(r!=0){
    return false;
    }
   else
          {
           var arr1=dat.split("-");
           var year1=parseInt(arr1[0]);
           var month1=parseInt(arr1[1]);
           var day1=parseInt(arr1[2]);
       
           var chk1=isDate1(year1,month1,day1);
           return chk1;
          }
     }
   function isDate1(year1,month1,day1)
  {
if(month1<1 || month1>12 || day1<1 || day1>31)
    {
        return false;
    }
    else
    {
        //小月判断
        if( (month1==4 || month1 ==6 || month1==9 || month1==11) && day1>30 )
        {
            return false;
        }
       
        //2月判断
        if(month1==2)
        {
            if(day1>29)
            {
                return false;
            }
       
            else
            {
                if( !(( year1 % 4 == 0 && year1 % 100 !=0 ) || ( year1 % 400==0)) && day1>28)
                {
                    return false;
                }
            }
        }
    }
    return true;
    }