> Well when you get the expires times in the cookie and compare it to
> the current hour on your machine you know the delay in which the
> cookie is supposed to expire.

Being able to do that would be nice, but the problem is that currently
there is no expiry time in the cookie.  The timestamp contained in the
cookie is generated by `make_cookie_time/0`, which is the time in
seconds at the point in time when the cookie was created, and therefore
not really helpful.  We can currently only make guesses about how long
a cookie is be valid.