bug#641: format-time-string %Z does not work, starting with Emacs 22.2

[Lennart Borgman (gmail)]

Eli Zaretskii wrote:
> > Date: Thu, 07 Aug 2008 20:51:11 +0200
> > From: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
> > CC: Ted Zlatanov <tzz@lifelogs.com>, bug-gnu-emacs@gnu.org
> >
> > Eli Zaretskii wrote:
> > > > From: Ted Zlatanov <tzz@lifelogs.com>
> > > > Date: Thu, 07 Aug 2008 08:20:46 -0500
> > > >
> > > > We could build a database of known Microsoft timezones and map them to
> > > > ISO timezones.  It has to be done just once and then updated very
> > > > rarely--timezone names don't change often.  The full list of timezones
> > > > is in 
> > > >
> > > > HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones 
> > > I already mentioned this possibility in an earlier message here.  The
> > > problem is that what you actually see in `tzname' could be a localized
> > > name, not the US English name.  So unless someone finds (or crafts) an
> > > exhaustive list of all TZ names both in English and in any localized
> > > language to which each one could be translated by Windows, this will
> > > work only on some machines.
> >
> > How many time zones are there?
>
> I see 87 on my machine.

Does that mean that there is a mapping one to many from the numeric 
format to the string format? How is that resolved?