Simple calendar object creation utility

createCalendarObject.js

(function() {
    'use strict';

    var month = 1;
    var year = 2021;

    var sqlResponse = [
        '2019-12-01',
        '2019-12-03',
        '2019-12-14',
        '2019-12-17'
    ];

    var inspectionAllocatedDays = {};
    for (var k = 0; k < sqlResponse.length; k++) {
        var dateStrSplit = sqlResponse[k].split('-');
        var day = dateStrSplit[dateStrSplit.length - 1];
        inspectionAllocatedDays[day] = true;
    }

    const d = (y, m) => new Date(y, m, 0).getDate();

    var daysInMonth = d(year, month);
    var firstBlankDays = new Date(year, month - 1, 1).getDay();
    var numIterations = Math.floor((firstBlankDays + daysInMonth) / 7) + (firstBlankDays === 0 ? 0 : 1);

    var monthDayCounter = 1;
    var responseMonthObj = {};
    for (var i = 1; i <= numIterations; i++) {
        if (!responseMonthObj[i]) {
            responseMonthObj[i] = [];
        }
        for (var j = 0; j < 7; j++) {
            if (i === 1 && j < firstBlankDays) {
                responseMonthObj[i].push({
                    day: 0
                });
                continue;
            }
            if (monthDayCounter <= daysInMonth) {
                responseMonthObj[i].push({
                    day: monthDayCounter,
                    isAllocated: inspectionAllocatedDays[monthDayCounter++] ? true : false
                });
            }
        }
    }

    var lastDayOfMonth = new Date(year, month, 0).getDay();
    if (lastDayOfMonth !== 6) {
        var lastWeekArr = responseMonthObj[numIterations];
        for (var l = lastDayOfMonth; l < 6; l++) {
            lastWeekArr.push({
                day: 0
            });
        }
    }
    console.log(Object.values(responseMonthObj));

})();