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

[Drew Adams]

> > I would expect there to be just a little bit more than 24 
> > possible different return values from "%z". It would be 24
> > if all zones where whole hours different from UTC (or what
> > it is called now). But since some zones uses
> > half hours it could be more.
> >
> > However 87 is a surprisingly high figure for me.
> 
> You're assuming too much. Countries in the same apparent time zone do
> not have to follow the same DST rules, for example.

Not just different DST rules, and not just language differences. Different
countries with regions in the same UTC offset can have different names for the
same zone: Cuba Summer Time and Chile Time are both UTC -04, for example.