$(document).ready(
    function(){
        var today = new Date();
        var the_date = new Date("December 31, 2023");
        var the_cookie_date = the_date.toGMTString();
        var the_cookie = "browser_size="+ $(window).width() +"x"+ $(window).height();
        var the_cookie = the_cookie + ";expires=" + the_cookie_date;
        document.cookie=the_cookie;
    });