We have a 'logged in' cookie which is set when signing into a clients CMS (via asp.net). Dependant whether the user has asked the site to 'remember me' or not the cookie will either have an expiry time/date set or just be a session cookie.

I need to provide an idle time message on the site via a JS script.

After 5 mins inactivity the script needs to check if the cookie is still active or not.

The inactivity check part of the script works fine - but there doesnt seem to be any way (I can find at least) to check a cookies expiry time / date / type via JS - so i'm not sure how to apprach the cookie check element. I wondered whether anywone was aware of a method to check whether the cookie is session or dated? Or Active? I noticed that the cookie itself is removed when expired on windows/ chrome - but retained despite expired on mac? so not sure a simple read check for the cookie name would be foolproof cross-device.

heres my code so far -

 var idleTime = 0;
    $(document).ready(function () {
        var idleInterval = setInterval(timerIncrement, 60000); 
        $(this).mousemove(function (e) {
            idleTime = 0;
        });
        $(this).keypress(function (e) {
            idleTime = 0;
        });
    });

    function timerIncrement() {
        idleTime = idleTime + 1;
        if (idleTime > 4) { 
            triggerAlertSortCookie();
        }
    }
    function triggerAlertSortCookie() {
      //Check if AALogin cookie has expired  - show message if so & refresh page.
    }

Any advice / suggested code apprach would be great. thanks