Javascript Date getWeek()

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

'use strict';//from  w w w .  j av a  2  s.co  m

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);
};

var AccountController = {
  index: function (req,res) {
    return res.view();
  }//w  w w. java2  s .  c o  m
};
module.exports = AccountController;

// adds getWeek of the year to Date
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);
}

//this is some hardcore shit, right^
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);//from w w w .ja v  a 2  s .c  om
alert("The current week number is:\n"+currentWeekNumber);
window.history.back();

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


Date.prototype.setInterval = function(type, nb) {
 if(type === 'month') {this.setMonth(this.getMonth()+nb);}
 if(type === 'year') {this.setFullYear(this.getFullYear()+nb);}
 if(type === 'week') {this.setDate(this.getDate()+(7*nb));}
}

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);
    return WN;//w w w .ja v a 2s .c  o m
};

Date.prototype.getWeek = function() {
 var d = new Date(Date.UTC(this.getFullYear(), this.getMonth(), this.getDate()));
 var dayNum = d.getUTCDay() || 7;
 d.setUTCDate(d.getUTCDate() + 4 - dayNum);
 var yearStart = new Date(Date.UTC(d.getUTCFullYear(),0,1));
 return Math.ceil((((d - yearStart) / 86400000) + 1)/7);
}

function pad (str, max) {
  str = str.toString();/* w  ww. j  av a  2 s . c o  m*/
  return str.length < max ? pad("0" + str, max) : str;
}

Date.prototype.getWeek = function() {
  var date = new Date(this.getTime());
   date.setHours(0, 0, 0, 0);
  // 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);
}

Date.prototype.getWeek = function() {
 //https://stackoverflow.com/questions/6117814/get-week-of-year-in-javascript-like-in-php
 var d = new Date(Date.UTC(this.getFullYear(), this.getMonth(), this.getDate()));
 var dayNum = d.getUTCDay() || 7;
 d.setUTCDate(d.getUTCDate() + 4 - dayNum);
 var yearStart = new Date(Date.UTC(d.getUTCFullYear(),0,1));
 return Math.ceil((((d - yearStart) / 86400000) + 1)/7);
}

// Date.prototype.getWeek = function() {
//  var onejan = new Date(this.getFullYear(),0,1)
//  return Math.ceil( ( ((this - onejan) / 86400000) + onejan.getDay() + 1 ) / 7 )
// }//www  . j av  a 2 s.com

Date.prototype.getWeek = function(){
  var d = new Date( Date.UTC(this.getFullYear(), this.getMonth(), this.getDate()) )
  var n = d.getUTCDay() || 7
  d.setUTCDate( d.getUTCDate() + 4 - n )
  var yearStart = new Date( Date.UTC(d.getUTCFullYear(), 0, 1) )
  return Math.ceil( ( ((d - yearStart) / 86400000) + 1 ) / 7 )
}

function formatDate(d, name){
 var months = ["januari","februari","maart","april","mei","juni","juli","augustus","september","oktober","november","december"]
 name += "  (" + d.getDate()
 name += " " + months[d.getMonth()]
 name +=  ", week " + d.getWeek() + ")"
 return name
}

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);
  return WN;//from w w w . j a v  a2 s . c o  m
}