Get Closest Week Day From Given Date [JavaScript]

<script>
function getNextDayOfWeek(date, dayOfWeek) {
    if (dayOfWeek < 0 || dayOfWeek > 6) return false;
    if (!isDateObjectValid(date)) return false;
    var resultDate = new Date(date.getTime());
    resultDate.setDate(date.getDate() + (7 + dayOfWeek - date.getDay()) % 7);
    return resultDate;
}

function getPreviousDayOfWeek(date, dayOfWeek) {
    if (dayOfWeek < 0 || dayOfWeek > 6) return false;
    if (!isDateObjectValid(date)) return false;
    var resultDate = new Date(date.getTime());
    resultDate.setDate(date.getDate() - (7 - dayOfWeek + date.getDay()) % 7);
    return resultDate;
}

function getClosestDayOfWeek(date, dayOfWeek) {
    if (dayOfWeek < 0 || dayOfWeek > 6) return false;
    if (!isDateObjectValid(date)) return false;
    var inputedDate = new Date(date.getTime());
    var nextDate = getNextDayOfWeek(inputedDate, dayOfWeek);
    var previousDate = getPreviousDayOfWeek(inputedDate, dayOfWeek);
    if (nextDate - inputedDate < inputedDate - previousDate) {
        return nextDate;
    }
    if (nextDate - inputedDate > inputedDate - previousDate) {
        return previousDate;
    }
    return inputedDate;
}

function isDateObjectValid(date) {
  return date instanceof Date && !isNaN(date);
}

var date = new Date("2019-12-19");
alert("Closest Friday: " + getClosestDayOfWeek(date, 5)); // 5 is Friday
</script>