Week Number

Get the current week number using jQuery.

HTML

<div id="weekNo"></div>
<div id="test"></div>

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


jQuery(function(){  
    var today = new Date();
    var weekno = today.getWeek();
    $("#weekNo").html(weekno);
});