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nncl/getWeek.js

Forked from dtomasi/getWeek.js
Created October 12, 2017 22:30
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Get Week of Year in Javascript
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getWeek.js
Date.prototype.getWeek = function() {
var jan4th = new Date(this.getFullYear(),0,4);
return Math.ceil((((this - jan4th) / 86400000) + jan4th.getDay()+1)/7);
}
var now = new Date();
var weekNumber = now.getWeek();
console.log(weekNumber);
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