End Date

$(document).ready(() => {
        $('#list').hide();
        $('#btn-booknow').attr('disabled', true);
        $('#end_date').attr('disabled', true);
    });

    // Disabling days
    var dateRange = JSON.parse(document.querySelector('.property-dates').dataset.unavailable);
    var startDate = {};
    var endDate = {};

    var unavailDates = function(date) {
        var allDates = [];
        for (let i = 0; i < dateRange.length; i++) {
            for (let j = 0; j < dateRange[i].length; j++) {
                allDates.push(dateRange[i][j]);
            }
        }
        var dateString = jQuery.datepicker.formatDate('yy-mm-dd', date);
        return [allDates.indexOf(dateString) == -1];
    }

    $(function() {
        $("#start_date").datepicker({
            minDate: 0,
            monthNamesShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
                "Nov", "Dec"
            ],
            changeMonth: true,
            changeYear: true,
            dateFormat: 'mm/dd/yy',
            beforeShowDay: unavailDates,
            onSelect: function() {
                var start_date = $('#start_date').datepicker('getDate');
                var end_date = $('#end_date').datepicker('getDate');
                var days_count = calcHolidays(start_date, end_date);
                var price = parseFloat($('#price').text());
                var total_price = parseFloat(price * days_count);

                $.ajax({
                    url: '',
                    data: '',
                    success: function(data) {
                        if(new Date(start_date).getDay() === new Date(end_date).getDay()) {
                            $('#list').hide();
                            $("#btn-booknow").attr("disabled", true);
                        } else {
                            $("#end_date").attr("disabled", (start_date == null));

                            if (end_date == null) {
                                $('#list').hide();
                                $("#btn-booknow").attr("disabled", true);
                            } else {
                                $('#list').show();
                                $('#totalDays').text(days_count);
                                $('#totalPrice').text('$ ' + total_price + '.00');
                                $("#btn-booknow").attr("disabled", false);
                            }
                        }
                    }
                });
            }
        }); // start date

        $("#end_date").datepicker({
            minDate: 0,
            monthNamesShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
                "Nov", "Dec"
            ],
            changeMonth: true,
            changeYear: true,
            dateFormat: 'mm/dd/yy',
            beforeShowDay: unavailDates,
            onSelect: function() {
                var start_date = $('#start_date').datepicker('getDate');
                var end_date = $('#end_date').datepicker('getDate');
                var days_count = calcHolidays(start_date, end_date);
                var price = parseFloat($('#price').text());
                var total_price = parseFloat(price * days_count);

                $.ajax({
                    url: '',
                    data: '',
                    success: function(data) {
                        if(new Date(start_date).getDay() === new Date(end_date).getDay()) {
                            $('#list').hide();
                            $("#btn-booknow").attr("disabled", true);
                        } else {
                            $("#end_date").attr("disabled", (start_date == null));

                            if (start_date == null) {
                                $('#list').hide();
                                $("#btn-booknow").attr("disabled", true);
                            } else {
                                $('#list').show();
                                $('#totalDays').text(days_count);
                                $('#totalPrice').text('$ ' + total_price + '.00');
                                $("#btn-booknow").attr("disabled", false);
                            }
                        }
                    }
                });
            }
        }); // end date
    }); // function

    // Calculator
    function calcHolidays(dDate1, dDate2) {
        var weeks, dateDiff, weekDay1, weekDay2;
        if (dDate2 < dDate1) return -1;
        weekDay1 = dDate1.getDay(),
            weekDay2 = dDate2.getDay();
        weeks = Math.floor((dDate2.getTime() - dDate1.getTime()) / 604800000);
        if (weekDay1 <= weekDay2)
            dateDiff = (weeks * 7) + (weekDay2 - weekDay1);
        else
            dateDiff = ((weeks + 1) * 7) - (weekDay1 - weekDay2);
        return (dateDiff);
    }