Fixing time zone

[Rodolfo Medina <rodolfo.medina@gmail.com>]

Hi all.

A friend of mine let me know that he receives my emails with a time stamp one
hour into the future.  It seems my computer or my service that forwards to
gmail is set to the wrong time or time zone.  From my header:

  Received: from hda6-hyundai ([151.83.162.201])
          by mx.google.com with ESMTPS id 15sm1318852fxm.2.2010.01.16.09.20.40
          (version=TLSv1/SSLv3 cipher=RC4-MD5);
          Sat, 16 Jan 2010 09:20:41 -0800 (PST)
  From: Rodolfo Medina <rodolfo.medina@gmail.com>
  Date: Sat, 16 Jan 2010 18:21:18 +0000
                         ^^^^^^^^^^^^^^
                                |

                                this is wrong

09:20:41 -0800 equals 17:20:41 +0000, not 18:21:18 +0000.  The friend suggests
that my time zone "+0000" should be "+0100" i.e.  CET.

Can anybody suggest how I can recover this?

Thanks for any help
Rodolfo