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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Setting TZ in set_time_zone_rule
Date: Fri, 30 Nov 2012 12:02:32 +0200
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> From: Fabrice Popineau <fabrice.popineau@gmail.com>
> Date: Fri, 30 Nov 2012 10:26:09 +0100
> Cc: Paul Eggert <eggert@cs.ucla.edu>, Andreas Schwab <schwab@linux-m68k.org>, emacs-devel@gnu.org
> 
> Do we really need to unsetenv the TZ variable?

Maybe not.  Paul, can you point out where would 'unsetenv' be needed,
and why?

> Also, is unsetenv("TZ") the same as putenv("TZ=") ?

Yes.