Question on id stability

Garrett Wollman wollman at
Mon Jan 3 22:59:07 UTC 2005

<<On Mon, 03 Jan 2005 14:24:48 -0800, Paul Eggert <eggert at CS.UCLA.EDU> said:

> Only if somebody builds the database without the "backwards" file,
> which lists the backwards-compatibility names.  The default is to
> include "backwards", as it includes very common IDs like US/Pacific.
> I'd be surprised (but not astonished) if someone omitted it.

FreeBSD does not use "backwards":

revision 1.6
date: 1994/09/13 21:54:06;  author: wollman;  state: Exp;  lines: +36 -133
New method for installing timezone data files, not nearly as complicated
as the previous one, and better integrated with the build scheme.

Define OLDTIMEZONES to get backward-compatibility links added.
Define LEAPSECONDS if you want leap-second support.

This change was made prior to the release of FreeBSD 2.0.  FreeBSD 1.x
(long obsolete) did support the old names.  (I don't recall whether it
supported the new names, but I suspect it didn't.)


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