Nodejs Week Get getWeekNumber()

Method Source Code

Date.prototype.getWeekNumber = function(){
    var d = new Date(+this);
    d.setHours(0,0,0);//from  w  w  w.j  a  v  a  2  s .  c  o m
    d.setDate(d.getDate()+4-(d.getDay()||7));
    return Math.ceil((((d-new Date(d.getFullYear(),0,1))/8.64e7)+1)/7);
};

Related

1. getWeekDayNameShort(lang)

   Date.prototype.getWeekDayNameShort = function(lang) {
       lang = lang && (lang in Date.locale) ? lang : 'de';
       return Date.locale[lang].day_names_short[this.getDay()];
   };
   Date.locale = {
       de: {
           month_names: ['Januar', 'Februar', 'M?', 'April', 'Mai', 'Juni', 'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'],
           month_names_short: ['Jan', 'Feb', 'M?, 'Apr', 'Mai', 'Jun', 'Jul', 'Aug', 'Sep', 'Okt', 'Nov', 'Dez'],
           day_names: ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'],
   ...
   

2. getWeekNumber()

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

3. getWeekNumber()

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

4. getWeekNumber()

   Date.prototype.getWeekNumber = 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);
   };
   function(doc) {
     var docdate = new Date(doc.created_at);
     if (doc.type === "entry")
   ...
   

5. getWeekNumber()

   Date.prototype.getWeekNumber = function() {
       var target = new Date(this.valueOf());
       var dauNumber = (this.getDay() + 6) % 7;
       target.setDate(target.getDate() - dauNumber + 3);
       var jan4 = new Date(target.getFullYear(), 0, 4);
       var dayDiff = (target - jan4) / 86400000;
       if (new Date(target.getFullYear(), 0, 1).getDay() < 5) {
           return 1 + Math.ceil(dayDiff / 7);
       else {
           return Math.ceil(dayDiff / 7);
   

6. getWeekNumber()

   Date.prototype.getWeekNumber = function () {
       var d = new Date(+this);
       d.setHours(0, 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);
   };
   

7. getWeekNumber()

   Date.prototype.getWeekNumber = 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);
   };
   

8. getWeekOfMonth()

   Date.prototype.getWeekOfMonth = function () {
     var today = new Date(this.getFullYear(), this.getMonth(), this.getDate());
     var firstOfMonth = new Date(today.getFullYear(), today.getMonth(), 1);
     return Math.ceil((((today - firstOfMonth) / 86400000) + firstOfMonth.getDay() + 1) / 7);
   };
   

9. getWeekOfYear()

   Date.prototype.getWeekOfYear = 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))/7);
   };