JSFiddle - React, Tailwind, and code Playground

by B L Praveen

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<img src = "http://dummyimage.com/120x90/f00/fff.png&text=my+image" />

JavaScript

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 + 1)/86400000);
  return Math.ceil(dayOfYear/7)
};

alert( new Date().getWeek() );