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Path: utzoo!watmath!clyde!burl!hou3c!Rick.Gumpertz@CMU-CS-A.ARPA
From: Rick.Gumpertz@CMU-CS-A.ARPA (Richard H. Gumpertz)
Newsgroups: net.mail.headers
Subject: Re: UTC Time stamping
Message-ID: <01Feb84.222129.RG02@CMU-CS-A>
Date: Wed, 1-Feb-84 22:21:00 EST
Article-I.D.: hou3c.229
Posted: Wed Feb  1 22:21:00 1984
Date-Received: Tue, 7-Feb-84 14:09:11 EST
Sender: ka@hou3c.UUCP (Kenneth Almquist)
Lines: 8
To: POSTEL@USC-ISIF
In-Reply-To: "POSTEL@USC-ISIF's message of 1 Feb 84 21:59-EST"

So we use ANSI (because we are Americans, mostly) for American time zones
in alphanumeric and other time zones in numeric.  As I recall, this is
a superset of the ISO standard but conveys more information (CDT differs from
EST but are numerically equal).