In jQuery datepicker beforeShowDay if fails

Question

HI. I'm having problem to highlight more days. Somehow the if statement in beforeShowDay isn't true when it should be :(

dateString typeof is string and an example is available in the screenshot at http://mikaelz.host.sk/datepicker.png

Pasted code:

var dates = new Array();
function addDate(date) {if (jQuery.inArray(date, dates) < 0) dates.push(date);}
function removeDate(index) {dates.splice(index, 1);}

function addOrRemoveDate(date) {
  var index = jQuery.inArray(date, dates);
  if (index >= 0)
    removeDate(index);
  else
    addDate(date);
}

function padNumber(number) {
  var ret = new String(number);
  if (ret.length == 1)
    ret = "0" + ret;
  return ret;
}

jQuery(document).ready(function(){
jQuery("#pick-date").datepicker({
      onSelect: function(dateText, inst) { addOrRemoveDate(dateText); },
      beforeShowDay: function (date){
        var year = date.getFullYear();
        var month = padNumber(date.getMonth());
        var day = padNumber(date.getDate());
        var dateString = day + "." + month  + "." + year;

        if (dates.indexOf(dateString) >= 0) {
          return [true,"ui-state-highlight"];
        }
        return [true, ""];
      }
    });
});

Big thanks for any good ideas what could be wrong.