writeCookie();

function writeCookie(){
    var today = new Date();
    var the_date = new Date("December 31, 2023");
    var the_cookie_date = the_date.toGMTString();
    var the_cookie = "users_resolution="+ screen.width +"x"+ screen.height;
    var the_cookie = the_cookie + ";expires=" + the_cookie_date + ";path=/";
    document.cookie=the_cookie;
}