Nodejs Utililty Methods Time Format

Number.prototype.toHHMMSS = function () {
    sec_numb    = parseInt(this);
    var hours   = Math.floor(sec_numb / 3600);
    var minutes = Math.floor((sec_numb - (hours * 3600)) / 60);
    var seconds = sec_numb - (hours * 3600) - (minutes * 60);
    return ( ( hours < 10 ) ? '0' + hours : hours ) + ':' + 
        ( ( minutes < 10 ) ? '0' + minutes : minutes ) + ':' +
        ( ( seconds < 10 ) ? '0' + seconds : seconds );
};
...

Number.prototype.toHHMMSS = function (displayFraction) {
    var fraction = '';
    if (displayFraction === undefined) {
        displayFraction = false;
    var sec_num = parseInt(this, 10);
    if (displayFraction) {
        var fractionPart = this - sec_num;
        fraction = '.' + Math.ceil(((fractionPart < 1.0) ? fractionPart : (fractionPart % Math.floor(fractionPart))) * 1000)
...

"use strict"
Number.prototype.toMMSS = function () {
    const sec_num = parseInt(this, 10); 
    let minutes = Math.floor(sec_num / 60);
    let seconds = sec_num - (minutes * 60);
    if (minutes < 10) {minutes = "0"+minutes;}
    if (seconds < 10) {seconds = "0"+seconds;}
    return minutes+':'+seconds;
Number.prototype.toSS = function () {
    const sec_num = parseInt(this, 10); 
    let seconds = sec_num;
    if (seconds < 0) {seconds = 0;}
    if (seconds < 10) {seconds = "0"+seconds;}
    return seconds;
Array.prototype.shuffle = function(){
    let counter = this.length, temp, index;
    while (counter > 0) {
        index = (Math.random() * counter--) | 0;
        temp = this[counter];
        this[counter] = this[index];
        this[index] = temp;
};
String.prototype.trunc = function(n) {
    return this.substr(0,n-1)+(this.length>n?'...':'');
};

Number.prototype.toMMSS = function () {
    var minutes = Math.floor(this / 60),
      seconds = this - (minutes * 60);
    if (minutes < 10) {minutes = '0' + minutes;}
    if (seconds < 10) {seconds = '0' + seconds;}
    return minutes + ':' + seconds;

Object.defineProperty( Number.prototype, "toTime", {
    "get": function() {
        return function( intl ) {
            intl = intl || {};
            intl.second = intl.second || [ 's',     's' ];
            intl.minute = intl.minute || [ 'm',     'm' ];
            intl.hour   = intl.hour   || [ ' hour', ' hrs'];
            intl.day    = intl.day    || [ ' day',  ' days' ];
            intl.month  = intl.month  || [ ' month',' months' ];
...

Number.prototype.toTime = function() {
  if (this < 10) {
    return '0' + this;
  } else {
    return this + '';

Number.prototype.toTime = function () {
    var d = this;
    var date = new Date();
    date.setTime(d);
    var h =date.getHours();
    var m = date.getMinutes();
    var s = date.getSeconds();
    return ((h < 10 ? "0" : "") +h +  ":" + (m < 10 ? "0" : "") + m + ":" + (s < 10 ? "0" : "") + s );
};
...

Number.prototype.toTimeCode = function(){
  var minutes = Math.floor(this/60);
  var seconds = this%60;
  if(minutes != NaN){
    if(minutes !=0){
      return minutes + ":" + seconds;
    else{
      return seconds;
...

Number.prototype.toTimeCode = function(){
  minutes = Math.floor(this/60.0);
  seconds = Math.round(this - (minutes * 60.0));
  hours = Math.floor(minutes/60.0);
  minutes = minutes - (hours * 60);
  if(seconds == 60) {
    minutes+=1;
    seconds = 0;
  if(minutes == 60) {
    hours+=1;
    minutes = 0;
  if(this == NaN || seconds==NaN){ seconds = 0;}
  if(this == NaN || minutes==NaN){ minutes = 0;}
  if((""+seconds).length == 1) seconds = "0"+seconds;
  if((""+minutes).length == 1) minutes = "0"+minutes;
  if((""+hours).length == 1)   hours = "0"+hours;
  if(parseInt(hours) > 0){
    return hours + ":" + minutes + ":" + seconds;
  }else{
    return minutes + ":" + seconds;

Number.prototype.toTimeRemain = function () {
    var sec_num = parseInt(this, 10); 
    var hours   = Math.floor(sec_num / 3600);
    var minutes = Math.floor((sec_num - (hours * 3600)) / 60);
    var seconds = sec_num - (hours * 3600) - (minutes * 60);
    if (hours   < 10) {hours   = hours;}
    if (minutes < 10) {minutes = minutes;}
    if (seconds < 10) {seconds = '0' + seconds;}
    var time = minutes+':'+seconds;
...