I've many computers running 6.1. The move to 01/01/00 went fine. The only
thing that I saw so far is that 'uptime' reports a 1 day uptime at 00h00,
and then a count of minutes starting at 00h00. For instance, if the
computer has been started 10 days ago, at 00h15, 'uptime' will say
Top(1) reports the same wrong uptime so I guess it is not uptime(1) that
is wrong itself.
However everything seems ok. I continue to test...
I cannot reproduce either the uptime or top problem on sparc or i386 ~6.1
(i.e. mostly upgraded to Raw Hide) Red Hat Linux.