Jquery UI date Picker disable enable Sunday, Thursday and disable specific dates - jquery-ui

Question

I'm trying to enable only Thursdays and Sundays but also disable some specific Sundays or Thursdays.
I'm trying with this function but it's not working yet:
<script>
var unavailableDates = ["2013-03-31", "2013-03-24"];
function disabledays(date) {
ymd = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate();
if ($.inArray(ymd, unavailableDates) == 0) {
return [false, "", "Unavailable"]
} else {
//Show only sundays and thuersdays
var day = date.getDay();
return [(day == 0 || day == 4)];
}
$('#txtDate').datepicker({
beforeShowDay: disabledays
})
</script>

Answer 1

Two problems:
The code that builds a date string does not add a 0 to the month portion. You could change your unavailableDates array.
You need to check the return value of $.indexOf to see if it's >= 0 instead of just equal to zero.
With both changes:
var unavailableDates = ["2013-3-31", "2013-3-24"];
function disabledays(date) {
var ymd = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate();
if ($.inArray(ymd, unavailableDates) >= 0) {
return [false, "", "Unavailable"];
} else {
//Show only sundays and thuersdays
var day = date.getDay();
return [(day == 0 || day == 4)];
}
}
$('#txtDate').datepicker({
beforeShowDay: disabledays
});
Example: http://jsfiddle.net/XJKbV/