datesDisable option

An array to specify dates to disable. It also adds the .disabled-date class in order to customise the UI.

Usage:

var input = $('<input />')
                .appendTo('#qunit-fixture')
                .val('2012-10-26')
                .datepicker({
                    format: 'yyyy-mm-dd',
                    datesDisabled: ['2012-10-1', '2012-10-10', '2012-10-20']
                }),