jquery ui date picker limit to Sundays

Question

I have looked at some of the answers here to this type of question but could not get them to work how I needed them to. I need to have my jQuery UI datepicker only allow Sun

Answer 1

// Enable Sunday only
$("#datepickerID").datepicker({
    dateFormat: 'dd-mm-yy',
    minDate: 1,
    beforeShowDay: enableSUNDAYS
});
// Custom function to enable SUNDAY only in jquery calender
function enableSUNDAYS(date) {
    var day = date.getDay();
    return [(day == 0), ''];
}