Update: But I see that all my Linux boxes just spat out this syslog:
Dec 31 15:59:59 cerebrum kernel: Clock: inserting leap second 23:59:60 UTC
(Nothing logged on OpenBSD.)
I am sad to report that MacOS X did not know about the leap second. 3:59:59 was immediately and shamefully followed by 4:00:00 instead of 3:59:60.
Current Music: Nina Gordon -- Badway ♬