bug#9614: date ignoring wrong TZ values

[Sandro Santilli]

I've been puzzled by date(1) giving weird results
when setting TZ to values unknown by zoneinfo.

As far as:

 $ TZ=Fake date
 Tue Sep 27 14:06:32 Fake 2011

It would be more helpful if the command raised an error 
or warning about "unknown" timezones rather than giving
random dates.

It's particularly anonying when the same TZ _reported_
by the command isn't recognized in input:

  $ date
  Tue Sep 27 16:08:13 CEST 2011

  $ TZ=CEST date
  Tue Sep 27 14:08:13 CEST 2011

Thanks for making a clock available for everyone, btw :)

--strk;

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