const holidays = { // keys are formatted as month,week,day
    "0,2,1": "Martin Luther King, Jr. Day",
    "1,2,1": "President's Day",
    "2,1,0": "Daylight Savings Time Begins",
    "3,3,3": "Administrative Assistants Day",
    "4,1,0": "Mother's Day",
    "4,-1,1": "Memorial Day",
    "5,2,0": "Father's Day",
    "6,2,0": "Parents Day",
    "8,0,1": "Labor Day",
    "8,1,0": "Grandparents Day",
    "8,-1,0": "Gold Star Mothers Day",
    "9,1,1": "Columbus Day",
    "10,0,0": "Daylight Savings Time Ends",
    "10,3,4": "Thanksgiving Day"
};
function getDate(year, month, week, day) {
    const firstDay = 1;
    if (week < 0) {
        month++;
    }
    const date = new Date(year, month, (week * 7) + firstDay);
    if (day < date.getDay()) {
        day += 7;
    }
    date.setDate(date.getDate() - date.getDay() + day);
    return date;
}
function getHoliday(month, week, day) {
    return holidays[month + "," + week + "," + day];
}
function getDateString(year, month, week, day) {
    const date = getDate(year, month, week, day);
    const holiday = getHoliday(month, week, day);
    let dateString = date.toLocaleDateString();
    if (holiday) {
        dateString += " \xa0\xa0\xa0" + holiday;
    }
    return dateString;
}
console.log(getDateString(2021, 4, -1, 1)); // Memorial Day, 2021