[tz] [PATCH 2/3] Replace some zones with links when that doesn't lose non-LMT info.

[Zefram]

yoshito_umaoka at us.ibm.com wrote:
>If my understanding is correct, the output from zic does not preserve 
>daylight saving amount.

Interesting, this is a better case than Stephen offered.  The tzfile does
indicate *which* clock settings are DST, so it's possible to determine
what is the most recently used base offset for any time.  But that's not
necessarily the current base offset if there's a change of base offset
while a zone remains on DST.  There are some instances of that in the
database, such as America/Argentina/San_Luis's change from -03:00 to
-04:00 on 2008-01-21 while on DST.

-zefram