Nodejs Utililty Methods Date Value Check

Date.prototype.isToDay =function(){
    var today = new Date();
    return today.toDateString() == this.toDateString();
};

Date.prototype.isToday = function(){
  const today = new Date();
  return this.getYear() === today.getYear() &&
    this.getMonth() === today.getMonth() &&
    this.getDate() === today.getDate();
};

Date.prototype.isToday = function() {
  return this.toLocaleDateString() === new Date().toLocaleDateString();

Date.prototype.isToday = function() {
    var today = new Date();
    return today.getYear() == this.getYear()
            && today.getMonth() == this.getMonth()
            && today.getDate() == this.getDate();
};

Date.prototype.isToday = function() {
    var today = new Date();
    return (today.getFullYear() == this.getFullYear() && today.getMonth() == this.getMonth() && today.getDate() == this.getDate());
};

Date.prototype.isValid = function() {
  return this.getTime() === this.getTime();
};
function twoDigits(value) {
  if (value < 10) {
    return '0' + value;
  return value;
exports.getMyDate = function(timestamp) {
  var date = new Date(timestamp * 1000);
  return date.getFullYear()
    + '-' + date.getMonth()
    + '-' + date.getDate();
exports.time = function() {
  var date = new Date();
  return date.valueOf() / 1000;

Date.isValid = function(y, m, d) {
    var date = new Date(y, m - 1, d);
    return (date.getFullYear() == y && date.getMonth() + 1 == m && date.getDate() == d);

Utils.isValidDate = function(date) { 
    var bits = date.split('-');
    var d = new Date(bits[0], bits[1] - 1, bits[2]);
    return d && (d.getMonth() + 1) == bits[1] && d.getDate() == Number(bits[2]);

function isValidDate(year, month, day) {
  var days = new Array (31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
     if(year%4==0 && year%100 !=0 || year%400==0)
       days[1]=29;
     else
       days[1]=28;
     if(month < 1 || month > 12)
       return false;
     if(day > days[month-1] || day < 1)
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