Nodejs Utililty Methods Week Get

Date.prototype.getWeek = function() {
  var onejan = new Date(this.getFullYear(),0,1);
  return Math.ceil((((this - onejan) / 86400000) + onejan.getDay()+1)/7);

'use strict';
Date.prototype.getWeek = function () {
  var firstOfJanuary = new Date(this.getFullYear(), 0, 1);
  return Math.ceil((((this - firstOfJanuary) / 86400000) + firstOfJanuary.getDay() + 1) / 7);
};

Date.prototype.getWeek = function() {
    var dt = new Date(this.getFullYear(),0,1);
    return Math.ceil((((this - dt) / 86400000) + dt.getDay()+1)/7);
};

function getRandomColor() {    
  return "rgb("+Math.floor((Math.random()*255)+1)+","+
    Math.floor((Math.random()*255)+1)+","+
    Math.floor((Math.random()*255)+1)+")";
Date.prototype.getWeek = function() {
  var onejan = new Date(this.getFullYear(),0,1);
  return Math.ceil((((this - onejan) / 86400000) + onejan.getDay()+1)/7);

Date.prototype.getWeek = function() {
    var onejan = new Date(this.getFullYear(), 0, 1);
    return Math.ceil((((this - onejan) / 86400000) + onejan.getDay() + 1) / 7);
var weekNumber = (new Date()).getWeek();
var dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
var now = new Date();
document.write(dayNames[now.getDay()] + " (" + weekNumber + ").");

Date.prototype.getWeek = function() {
    var tmpDate = new Date();
    tmpDate.setFullYear(this.getFullYear(), this.getMonth(), this.getDate());
    var D = tmpDate.getDay();
    if(D == 0) D = 7;
    tmpDate.setDate(tmpDate.getDate() + (4 - D));
    var YN = tmpDate.getFullYear();
    var ZBDoCY = Math.floor((tmpDate.getTime() - new Date(YN, 0, 1, -6)) / 86400000);
    var WN = 1 + Math.floor(ZBDoCY / 7);
...

Date.prototype.getWeek = function(){
    var d = new Date(+this);
    d.setHours(0,0,0);
    d.setDate(d.getDate()+4-(d.getDay()||7));
    return Math.ceil((((d-new Date(d.getFullYear(),0,1))/8.64e7)+1)/7);
};

Date.prototype.getWeek = function() {
  var onejan = new Date(this.getFullYear(), 0, 1);
  return Math.ceil((((this - onejan) / 86400000) + onejan.getDay() + 1) / 7);
var today = new Date();
var daynum = today.getDOY();
var weeknr = (new Date()).getWeek();
var d = (new Date()).getDay();
var day = (new Date()).getDate();
...

Date.prototype.getWeek = function() {
  var onejan = new Date(this.getFullYear(),0,1);
  var today = new Date(this.getFullYear(),this.getMonth(),this.getDate());
  var dayOfYear = ((today - onejan + 86400000)/86400000);
  return Math.ceil(dayOfYear/7)
};
var today = new Date();
var currentWeekNumber = today.getWeek();
console.log(currentWeekNumber);
...

Date.prototype.getWeek = function() {
  var date = new Date(this.getTime());
   date.setHours(0, 0, 0, 0);
  date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
  var week1 = new Date(date.getFullYear(), 0, 4);
  return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000
                        - 3 + (week1.getDay() + 6) % 7) / 7);