posixrules

[Robert Simmons]

I am a bit confused about the file /usr/share/zoneinfo/posixrules

Looking through the docs, it seems that according to tzset(3) the file
is "rules for POSIX-style TZ's" but after examining the file, it is
identical to the file /usr/share/zoneinfo/America/New_York and the
date stamp on the file is back in Feb (when 8.2-RELEASE was built), so
it was not created when I ran tzsetup and selected New_York as my
timezone.

Can someone explain why these two files are the same?