[tz] Austin Group POSIX TZ changes and Time Zone Taxonomy

[Robert Elz]

    Date:        Wed, 22 Feb 2023 14:48:17 -0800
    From:        Paul Eggert via tz <tz at iana.org>
    Message-ID:  <c806cfc3-ba88-4533-be84-abb97b8d3330 at cs.ucla.edu>

  | Not sure what wording improvements you have in mind.

Nor am I.   POSIX bug 1619 is one of mine, which has/had nothing
to do with the TZ definition, that change just got bolted on as an
freebie...

  | The biggest glitch I can see with the wording as applied is that it says 
  | that TZ="America/New_York" will set "The timezone names for standard 
  | time (std) and, if observed, for DST (dst) to be used by tzset()."

Yes, there is unfortunately a very limited understanding of how
local time sometimes works in that group.

  | Presumably this glitch is related to POSIX also considering adding 
  | support for tm_gmtoff and tm_zone - do you know what's going on there?

That happened.  If you want I will dig out the bug number.

When the next draft appears I will be checking all of the time
related structs & funcs again.

kre