$('#datetimepicker1').datepicker({});
                    

                        $.get("server/adapter.php", function(data){
                            disabledDates = data.split(',');
                            $('#datetimepicker2').datepicker({
                                format: 'yyyy-mm-dd',
                                datesDisabled: disabledDates,
                            });
                        });
                    

                     $.get("server/adapter.php", function(data){
                        disabledDates = data.split(',');
                        $('#datetimepicker3').datepicker({
                            format: 'yyyy-mm-dd',
                            datesDisabled: disabledDates,
                            First Day = Tuesday,
                            language: 'de'
                        });
                    });
                            

                     $('.calendar').map(function(index) {
                        $(this).datepicker({
                            defaultViewDate: {
                                year: (new Date()).getFullYear(),
                                month: (new Date()).getMonth() + index,
                                date: 1
                            },
                            multidate: true,
                            updateViewDate: false
                        });
                    });

                    // keep month in sync
                    var orderMonth = function(e) {
                        var target = e.target;
                        var date = e.date;
                        var calendars = $('.calendar');
                        var positionOfTarget = calendars.index(target);
                        calendars.each(function(index) {
                            if (this === target) {
                                return;
                            }
                            var newDate = new Date(date);
                            newDate.setUTCDate(1);
                            newDate.setMonth(
                                date.getMonth() + index - positionOfTarget
                            );

                            $(this).datepicker('_setDate', newDate, 'view');
                        });
                    };
                    $('.calendar').on('changeMonth', orderMonth);

                    // keep dates in sync
                    $('.calendar').on('changeDate', function(e) {
                        var calendars = $('.calendar');
                        var target = e.target;
                        var newDates = $(target).datepicker('getUTCDates');
                        calendars.each(function() {
                            if (this === e.target) {
                                return;
                            }

                            // setUTCDates triggers changeDate event
                            // could easily run into an infinite loop
                            // therefore we check if currentDates equal newDates
                            var currentDates = $(this).datepicker('getUTCDates');
                            if (
                                currentDates &&
                                currentDates.length === newDates.length &&
                                currentDates.every(function(currentDate) {
                                    return newDates.some(function(newDate) {
                                        return currentDate.toISOString() === newDate.toISOString();
                                    })
                                })
                            ) {
                                return;
                            }

                            $(this).datepicker('setUTCDates', newDates);
                        });
                    });