dt = document.wheater.seldate.value;
      
var oneDay = 60 * 1000 * 60 * 24;
var da = new Array();
da = dt.split('-');
      
var da1t = new Date( da[0], da[1], da[2] );
var da1 = da1t.getFullYear() + "-" + da1t.getMonth() + "-" + da1t.getDay();
      
alert(da1);

function select_date()
{
   dt = document.wheater.seldate.value;
      
   var oneDay = 60 * 1000 * 60 * 24;
   var da = new Array();
   da = dt.split('-');
      
   var da1t = new Date( da[0], da[1], da[2] );
   var da1 = da1t.getFullYear() + "-" + da1t.getMonth() + "-" + da1t.getDate();
      
   var da2t = new Date();
   da2t.setTime(da1t.getTime() + oneDay);
   var da2 = da2t.getFullYear() + "-" + da2t.getMonth() + "-" + da2t.getDate();

   var da3t = new Date();
   da3t.setTime(da2t.getTime() + oneDay);
   var da3 = da3t.getFullYear() + "-" + da3t.getMonth() + "-" + da3t.getDate();

   document.getElementById("dt1").innerHTML = '<p>'+da1+'</p>';
   document.getElementById("dt2").innerHTML = '<p>'+da2+'</p>';
   document.getElementById("dt3").innerHTML = '<p>'+da3+'</p>';
}