>>>>> "JH" == Jeremy Hylton <jeremy@zope.com> writes: JH> It's relying on some internal implementation details -- JH> specifically that it divides the times it uses by 3 and then JH> takes % 65356. So it you specifiy an age greater than 3 * JH> 65536, then you've effectively specified an age older than all JH> objects. Oh, that's perfectly clear then, never mind! :) Sounds like -1 is the better choice. -Barry