Nodejs Utililty Methods Date YYYYMMDD Format

Date.prototype.yyyymmdd = function() {
  var mm = this.getMonth() + 1; 
  var dd = this.getDate();
  mm = mm < 10 ? '0'+ mm : mm;
  dd = dd < 10 ? '0'+ dd : dd;
  return [this.getFullYear(), mm, dd].join(''); 
};

Date.prototype.yyyymmdd = function() {
    var yyyy = this.getFullYear().toString()
       , mm = (this.getMonth()+1).toString() 
       , dd  = this.getDate().toString();
    return yyyy +"-"+ (mm[1]?mm:"0"+mm[0]) +"-"+ (dd[1]?dd:"0"+dd[0]);     
};

var net = require('net');
var port = process.argv[2];
Date.prototype.yyyymmdd = function() {
  var yyyy = this.getFullYear().toString();
  var mm = (this.getMonth()+1).toString(); 
  var dd  = this.getDate().toString();
  var hh = this.getHours().toString();
  var minute = this.getMinutes().toString();
  return yyyy + '-' + (mm[1]?mm:"0"+mm[0]) + '-' + (dd[1]?dd:"0"+dd[0]) + ' ' +
...

Date.prototype.yyyymmdd = function () {
    var yyyy = this.getFullYear().toString();
    var mm = (this.getMonth() + 1).toString(); 
    var dd = this.getDate().toString();
    return yyyy + "-" + (mm[1] ? mm : "0" + mm[0]) + "-" + (dd[1] ? dd : "0" + dd[0]);
};

var pi_180 = Math.PI / 180.0;
var pi_4 = Math.PI * 4;
function LatLongToPixelXY(latitude, longitude) {
  var sinLatitude = Math.sin(latitude * pi_180);
  var pixelY = (0.5 - Math.log((1 + sinLatitude) / (1 - sinLatitude)) /(pi_4)) * 256;
  var pixelX = ((longitude + 180) / 360) * 256;
  var pixel =  { x: pixelX, y: pixelY };
  return pixel;
Date.prototype.yyyymmdd = function() {         
  var yyyy = this.getUTCFullYear().toString();                                    
  var mm = (this.getUTCMonth()+1).toString();
  var dd  = this.getUTCDate().toString();             
  return yyyy + '-' + (mm[1]?mm:"0"+mm[0]) + '-' + (dd[1]?dd:"0"+dd[0]);
};

Date.prototype.yyyymmdd = function() {
  var yyyy = this.getFullYear().toString();
  var mm = (this.getMonth()+1).toString(); 
  var dd  = this.getDate().toString();
  return yyyy + (mm[1]?mm:'0'+mm[0]) + (dd[1]?dd:'0'+dd[0]); 
};
var todaysDate = new Date().yyyymmdd();

Date.prototype.yyyymmdd = function() {
    var yyyy = this.getFullYear().toString();
    var mm = (this.getMonth()+1).toString(); 
    var dd  = this.getDate().toString();
    return yyyy +"-"+ (mm[1]?mm:"0"+mm[0]) +"-"+ (dd[1]?dd:"0"+dd[0]); 
};

Date.prototype.yyyymmdd = function() {
    var today = new Date();
    var tomorrow = new Date();
    tomorrow.setDate(today.getDate() + 1);
    var mm = tomorrow.getMonth() + 1;
    var dd = tomorrow.getDate();
    return [this.getFullYear(), !mm[1] && '-', mm, !dd[1] && '-', dd].join('');
};

Date.prototype.yyyymmdd = function() {
  var yyyy = this.getFullYear().toString();
  var mm = (this.getMonth()+1).toString(); 
  var dd  = this.getDate().toString();
  return yyyy + '-' + (mm[1]?mm:"0"+mm[0]) + '-' + (dd[1]?dd:"0"+dd[0]); 
};

Date.prototype.yyyymmdd = function() {
 var yyyy = this.getFullYear().toString();
 var mm = (this.getMonth()+1).toString(); 
 var dd  = this.getDate().toString();
 return yyyy + "-" +(mm[1]?mm:"0"+mm[0]) + "-" +(dd[1]?dd:"0"+dd[0]); 
};
Date.prototype.hhmm = function() {
 var hh = this.getHours().toString();
 var mm  = this.getMinutes().toString();
...