I don't think it's anything wrong with Date::Manip, but rather somethine wrong with RedHat 8.0. I have perl 5.8.0 on my solaris box and it doesn't have a problem with my Date::Manip scripts. But my desktop with RH8 does.

I started a bug on redhat's bugzilla: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=74884