expires are forever?

[David Champion]

gpg: NOTE: signature key expired Thu Jul 20 05:33:42 2000 CDT
pub  1024D/AB61503F  created: 1999-12-09 expires: never      trust: m/u
sub  1024g/07D6E6DD  created: 1999-12-09 expires: never     

This key had no expiry, then (several days ago) I changed it to expire
today.  Later the same day, I thought better of that, and changed it
back to 'never'.  That appears not to have worked, although something
thinks that it did.

Can someone explain this to me?  Thanks.

-- 
 -D.	dgc@uchicago.edu	NSIT	University of Chicago