timezone/daylight savings time problem on solaris 2.6

There is a possible problem with nullmailer 1.03 and the handling of 
timezone or daylight savings time (not sure which) on Solaris (Sparc) 2.6

Included below are headers of a message sent at 1:13pm central 
(-0500).  The Date: header is correct but I think that is supplied by 
the e-mail client (using the UNIX command-line "mail johncoy <at> anc.net" 
for this test).  However, the Received: (nullmailer...) header has 
the wrong time.

13:11:40 -0500 should be 18:11:40 -0000

I verified my /etc/TIMEZONE file shows US/Central and that is the 
correct off-set (-0500) for daylight savings time.

Looks to me like nullmailer is not properly calculating daylight 
savings time and is instead using -0600 as the timezone offset for US/Central

--

Return-Path: <root <at> oracle.arkansas.net>
Delivered-To: johncoy <at> arkansas.net
Received: (qmail 29260 invoked by alias); 15 Dec 2006 19:11:40 -0000
Delivered-To: alias-johncoy <at> anc.net
Received: (qmail 29255 invoked from network); 15 Dec 2006 19:11:40 -0000
Received: from oracle.anc.net (216.152.25.100)
   by arkansas.net with SMTP; 15 Dec 2006 19:11:40 -0000
Received: (nullmailer pid 3626 invoked by uid 0);
	Fri, 15 Dec 2006 19:11:40 -0000
To: johncoy <at> anc.net
Subject: test at 1:13pm