Nodejs Utililty Methods Date Convert

Date.prototype.toLocalTime = function() {
    const newDate = new Date(this.getTime()+this.getTimezoneOffset()*60*1000);
    let offset = this.getTimezoneOffset() / 60;
    const hours = this.getHours();
    if (this.dst()) offset--;
    newDate.setHours(hours - offset);
    return newDate;
};

'use strict';
Date.prototype.toLocaleFormat = Date.prototype.toLocaleFormat || function (pattern) {
        return pattern.replace(/%Y/g, this.getFullYear()).replace(/%m/g, (this.getMonth() + 1)).replace(/%d/g, this.getDate());
    };

Date.prototype.toLocaleJSON = function() {
  var t = this,
    y = t.getFullYear(),
    M = t.getMonth() + 1,
    d = t.getDate(),
    h = t.getHours(),
    m = t.getMinutes(),
    s = t.getSeconds();
  return y + '/' + (M < 10 ? '0' + M : M) + '/' + (d < 10 ? '0' + d : d) + ' ' +
...

Date.prototype.toLongintText=function(){ 
  var m; 
  var d; 
  if(this.getMonth()<9){ 
  m="0"+(this.getMonth()+1); 
  }else{ 
  m=this.getMonth()+1; 
  if(this.getDate()<10){ 
...

Date.prototype.toOADate = function ()
  var jsDate = this || new Date();
  var timezoneOffset = jsDate.getTimezoneOffset() / (60 * 24);
  var msDateObj = (jsDate.getTime() / 86400000) + (25569 - timezoneOffset);
  return msDateObj;

Date.prototype.toRFC2822 = function() {    
    return [
          Date.DAYS[this.getDay()] + ","
        , Date.padZero(this.getDate())
        , Date.MONTHS[this.getMonth()]
        , this.getFullYear()
        , this.getTimeString()
        , this.getTimezoneOffsetString()
    ].join(" ");
...

Date.prototype.toRFC3339 = function()
  var year = this.getFullYear();
  var month = this.getMonth()+1;  
  var date = this.getDate();
  var hours = this.getHours();
  var mins = this.getMinutes();
  var secs = this.getSeconds();
  return (year+'-'+month+'-'+date+' '+hours+':'+mins+':'+secs);
...

Date.prototype.toRails = function(name) {
   var dateParams;
   dateParams = {};
   dateParams[name + "(1i)"] = this.getFullYear();
   dateParams[name + "(2i)"] = this.getMonth() + 1;
   dateParams[name + "(3i)"] = this.getDate();
   dateParams[name + "(4i)"] = this.getHours();
   dateParams[name + "(5i)"] = this.getMinutes();
   return dateParams;
...

Date.prototype.toReadableTime = function() {
  if(this.getHours()>0) {
    return this.getHours()+"h "+this.getMinutes()+" min"
  } else {
    return this.getMinutes()+" min"

Date.prototype.toRelativeTime = function( now_threshold ) {
  var delta = new Date() - this;
  now_threshold = parseInt(now_threshold, 10);
  if (isNaN(now_threshold)) {
    now_threshold = 0;
  if (delta <= now_threshold) {
    return 'Just now';
  var units = null;
  var conversions = {
      millisecond : 1, 
      second : 1000, 
      minute : 60, 
      hour : 60, 
      day : 24, 
      month : 30, 
      year : 12
  };
  for ( var key in conversions) {
    if (delta < conversions[key]) {
      break;
    else {
      units = key; 
      delta = delta / conversions[key];
  delta = Math.floor(delta);
  if (delta !== 1) {
    units += "s";
  return [ delta, units ].join(" ");
};
Date.fromString = function( str ) {
  return new Date(Date.parse(str));
};