clanehin reported this on IRC, but I was getting the same failures with 6.6.1,
but hadn't reported them yet for fear it was something unique to my environment.
It seems they might be a real issue. The tests are indicating that in 5 cases,
date matching is failing. 

If it matters, my failures have happened in the Eastern Standard Time timezone
at various times of day, and clanehin was also running the tests in the same
time zone. 

My platform was Ubuntu 7.10. clanehin's was Debian/Unstable.

#####

#
merging_newlines.......................ok
#
match..................................1/?
#
#     Failed test (match.pl at line 233)
#
#                   ''
#
#     doesn't match '(?-xism:tester)'
#
 
#
#     Failed test (match.pl at line 233)
#
#                   ''
#
#     doesn't match '(?-xism:tester)'
#
match..................................19/?
#
#     Failed test (match.pl at line 233)
#
#                   ''
#
#     doesn't match '(?-xism:tester)'
#
 
#
#     Failed test (match.pl at line 233)
#
#                   ''
#
#     doesn't match '(?-xism:tester)'
#
 
#
#     Failed test (match.pl at line 233)
#
#                   ''
#
#     doesn't match '(?-xism:tester)'
#
# Looks like you failed 5 tests of 80.
#
match.................................. Dubious, test returned 5 (wstat 1280, 0x500)
#
 Failed 5/80 subtests

Tommy already submitted a patch fixing this by setting the timezone to be UTC. 
This changes the test suite to whitewash over the bug until we get the bug fixed
(which is that we don't handle date matching properly with timezones).  The
problem was that at the times I usually work, my time and UTC are close enough
that the tests pass for me.

David

These tests all pass for me now.