Incorrect Date

[Former user]

I have this message header:

Delivered-To: [e-mail]
Received: by 10.76.1.51 with SMTP id 19cs60029oaj;
        Mon, 16 Jul 2012 19:55:11 -0700 (PDT)
Received: by 10.236.155.166 with SMTP id j26r5464yhk.0.1342493701955;
        Mon, 16 Jul 2012 19:55:01 -0700 (PDT)
Return-Path: <[e-mail]>
Delivered-To: [e-mail]
Received: from localhost (cs1.domain.com [127.0.0.1])
    by cs1.domain.com (Postfix) with ESMTP id F41B923B9C
    for <[e-mail]>; Mon,  7 May 2012 08:53:50 -0300 (BRT)
X-Virus-Scanned: Debian amavisd-new at cs1.domain.com
X-Spam-Flag: NO
X-Spam-Score: -0.802
X-Spam-Level: 
X-Spam-Status: No, score=-0.802 required=4 tests=[BAYES_00=-1.9,
    INVALID_DATE=1.096, MIME_BASE64_BLANKS=0.001,
    RCVD_IN_DNSWL_NONE=-0.0001, TVD_SPACE_RATIO=0.001] autolearn=no
Received: from cs1.domain.com ([127.0.0.1])
    by localhost (cs1.domain.com [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id yYEIOsAfPlVI for <[e-mail]>;
    Mon,  7 May 2012 08:53:49 -0300 (BRT)
X-Original-Helo: relay03.email.alog.com.br
Received: from relay03.email.alog.com.br (relay03.email.alog.com.br [200.219.210.26])
    by cs1.domain.com (Postfix) with ESMTP id C35AF23B9A
    for <[e-mail]>; Mon,  7 May 2012 08:53:49 -0300 (BRT)
Received: from balcao1 (111-11-111-15.some.net.br [111.11.111.15])
    (Authenticated sender: [e-mail])
    by relay03.email.alog.com.br (Postfix) with ESMTPA id EBA1E38050E5
    for <[e-mail]>; Mon,  7 May 2012 08:53:46 -0300 (BRT)
Date: Mon,  7 May2012 08:53:45 +0100
From:  <[e-mail]>
Reply-To:  <[e-mail]>
To: <[e-mail]>
Subject: boleto                                                                                                                                                
X-Mailer: Harbour TSMTP by Matteo Baccan
Mime-Version: 1.0
Content-Type: multipart/mixed;
        boundary="----=_NextPart_000_0052_01C2F554.33353C20"
X-Antivirus: avast! (VPS 120507-0, 07/05/2012), Outbound message
X-Antivirus-Status: Clean
Message-Id: <[e-mail]>

In my search, is shows as "2036.06.12".

Why?

[Janos SUTO]

It's a malformed date header: there's no space between "May" and "2012".