// loading at all pages
function getCookie(c_name){

    if(document.cookie.length > 0){
        c_start=document.cookie.indexOf(c_name + "=");

        if(c_start != -1){
            c_start = c_start + c_name.length+1;
            c_end = document.cookie.indexOf(";",c_start);

        if (c_end == -1)
            c_end = document.cookie.length;

        return unescape(document.cookie.substring(c_start,c_end));
        }
    }

return null;
}

offset = getCookie('timeZoneOffset');

if(offset == null){
    tUser = new Date();
    tExpire = new Date(2020, 01, 01);
    cookie = 'timeZoneOffset=' + tUser.getTimezoneOffset() + "; ";
    cookie += 'expires=' + tExpire.toGMTString() + '; Path=/';
    document.cookie = cookie;
}