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);
function sumArr(arr) {
    return arr.reduce(function (a, b) { return a + b; }, 0);
function formatTime(val) {
    var sec_num = parseInt(val, 10); 
...

Date.prototype.getWeek = function(){
    var day_miliseconds = 86400000,
        onejan = new Date(this.getFullYear(),0,1,0,0,0),
        onejan_day = (onejan.getDay()==0) ? 7 : onejan.getDay(),
        days_for_next_monday = (8-onejan_day),
        onejan_next_monday_time = onejan.getTime() + (days_for_next_monday * day_miliseconds),
        first_monday_year_time = (onejan_day>1) ? onejan_next_monday_time : onejan.getTime(),
        this_date = new Date(this.getFullYear(), this.getMonth(),this.getDate(),0,0,0),
        this_time = this_date.getTime(),
...

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);
function getDay(yyyyMMdd) {
  return new Date(yyyyMMdd).getDay();
...

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);
Date.prototype.getWeekYear = function() {
  var date = new Date(this.getTime());
...

'use strict';
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 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);
Date.prototype.getWeekYear = function() {
...

Date.prototype.getWeek = function () {
    var target  = new Date(this.valueOf());
    var dayNr   = (this.getDay() + 6) % 7;
    target.setDate(target.getDate() - dayNr + 3);
    var firstThursday = target.valueOf();
    target.setMonth(0, 1);
    if (target.getDay() != 4) {
        target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7);
    return 1 + Math.ceil((firstThursday - target) / 604800000);

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

Date.prototype.getWeek = function()
    var today = new Date(this.setHours(0, 0, 0, 0));
    var date = today.getDate() - today.getDay();
    var StartDate = new Date(today.setDate(date));
    var EndDate = new Date(today.setDate(date + 6));
    return [StartDate, EndDate];

Date.prototype.getWeek = function () {
  var onejan = new Date(this.getFullYear(), 0, 1);
  var time   = this.getMilliseconds() +
               this.getSeconds() * 1000 +
               this.getMinutes() * 60 * 1000 +
               this.getHours() * 60 * 60 * 1000;
  return Math.ceil((((this - onejan - time) / 86400000) + onejan.getDay() + 1) / 7);
};