Military / NATO single-letter time zone names
Markus Kuhn
Markus.Kuhn at cl.cam.ac.uk
Mon Apr 30 17:08:16 UTC 2001
Interesting bit from the new RFC 2822, which supersedes the RFC 822
Internet email header format:
The form "+0000" SHOULD be used to indicate a time zone at
Universal Time. Though "-0000" also indicates Universal Time, it is
used to indicate that the time was generated on a system that may be
in a local time zone other than Universal Time and therefore
indicates that the date-time contains no information about the local
time zone.
[...]
The 1 character military time zones were defined in a non-standard
way in [RFC822] and are therefore unpredictable in their meaning.
The original definitions of the military zones "A" through "I" are
equivalent to "+0100" through "+0900" respectively; "K", "L", and "M"
are equivalent to "+1000", "+1100", and "+1200" respectively; "N"
through "Y" are equivalent to "-0100" through "-1200" respectively;
and "Z" is equivalent to "+0000". However, because of the error in
[RFC822], they SHOULD all be considered equivalent to "-0000" unless
there is out-of-band information confirming their meaning.
Markus
--
Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
Email: mkuhn at acm.org, WWW: <http://www.cl.cam.ac.uk/~mgk25/>
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