Nodejs Week Get getWeek()

Method Source Code

// Returns the ISO week of the date.
Date.prototype.getWeek = function() {
  var date = new Date(this.getTime());
  date.setHours(0, 0, 0, 0);//  www.  j a  v a 2  s. c  om
  // Thursday in current week decides the year.
  date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
  // January 4 is always in week 1.
  var week1 = new Date(date.getFullYear(), 0, 4);
  // Adjust to Thursday in week 1 and count number of weeks from date to week1.
  return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000 - 3 + (week1.getDay() + 6) % 7) / 7);
}

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

function getWeek(yyyyMMdd) {
   return new Date(yyyyMMdd).getWeek();
}

function getMonthAsShortString(value) {
   months = [ 'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];
   return months[value-1];
}

function convertToDDMMYYYY(yyyyMMdd) {
   var pattern = /(\d{4})-(\d{2})-(\d{2})/;
   return yyyyMMdd.replace(pattern, '$3/$2/$1');
}

Related

1. getWeek()

   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();
   ...
   

2. getWeek()

   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);
   ...
   

3. getWeek()

   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);
   

4. getWeek()

   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); 
   ...
   

5. getWeek()

   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(),
   ...
   

6. getWeek()

   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());
   ...
   

7. getWeek()

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

8. getWeek()

   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() {
   ...
   

9. getWeek()

   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);