[tz] data not represented in tzfiles
eggert at cs.ucla.edu
Fri Sep 6 03:08:44 UTC 2013
> I've posted a patch more than one that would make the
> 400 year hack more robust, and it seems to have got lost each time.
> It's sitting on a branch in my public git repo.
Sorry about that, it was still in my inbox. I revisited it
today. It inserts an artificial mark into the zic binary
file so that, for zones in which POSIX TZ strings cannot
support time stamps into the indefinite future, a consumer
of the binary file can more easily determine where its data
This jogged my brain to look two other items in my inbox
that are relevant and less problematic. I fixed these and
pushed the fixes into the experimental github.
First, "Record that San Luis is at UTC-3, not UTC-4 with perpetual DST."
adjusts Argentina/San_Luis to not have a weird setting of
perpetual DST indefinitely into the future, a setting that
POSIX TZ strings cannot represent.
Second, "Support time stamps past 2038 in zones like America/Santiago"
fixes zic to generate TZ strings that work into the
indefinite future for almost all zones where this was a
problem, thus removing the need for the artificial mark in
There's one remaining zone which has the problem, namely
Asia/Tehran, but I don't think your 400-year change fixes
it. So, I'm hoping that your fix is no longer needed, in
that the other two patches have fixed things in a different way.
Anyway, thanks for bringing this up, as it prompted fixes
for the problems in the database or the way it's processed
on POSIX platforms.
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