date counter

    <table style="border: 1px solid black;">
                                <tr>
                                    <th>
                                        Настаняване:
                                    </th>
                                    <td>
                                        <input type="text" name="fromDate" id="fromDate" value="<?php echo date('01-m-Y'); ?>" />
                      <input type="button" id="calendarButtonFrom" value="Избери дата" />
                                    </td>
                                </tr>
                                <tr>
                                    <th>
                                        Напускане:
                                    </th>
                                    <td>
                                        <input type="text" name="toDate" id="toDate" value="<?php echo date('05-m-Y'); ?>" readonly />
                      <input type="button" id="calendarButtonTo" value="Избери дата" />
                                    </td>
                                </tr>
                                <tr>
                                    <th>
                                        Общ период нощувки:
                                    </th>
                                    <td>
                                        <input type="text" name="stay_days" id="stay_days" readonly>
                                    </td>
                                </tr>
                            </table>


<script type="text/javascript">
            Calendar.setup(
              {
                inputField: "fromDate",
                button: "calendarButtonFrom",
                align: "Tr"
              }
            );
            Calendar.setup({inputField: "toDate", button: "calendarButtonTo", align: "Tr"});
            $("#fromDate").bind('input', function(){
              alert("aaaa");
            });

            var a = $('#fromDate').val();
            var b = $('#toDate').val();

            function convertDigitIn(str){
              return str.split('-').reverse().join('-');
            }

            var a1 = convertDigitIn(a);
            var b1 = convertDigitIn(b);

            function treatAsUTC(date) {
              var result = new Date(date);
              result.setMinutes(result.getMinutes() - result.getTimezoneOffset());
              return result;
            }

            function daysBetween(startDate, endDate) {
              var millisecondsPerDay = 24 * 60 * 60 * 1000;
              return (treatAsUTC(endDate) - treatAsUTC(startDate)) / millisecondsPerDay;
            }

            var result = daysBetween(a1, b1);
            $('#stay_days').val(result);
</script>