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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!tik.vtt.fi!tik.vtt.fi!tml
- From: tml@tik.vtt.fi (Tor Lillqvist)
- Newsgroups: comp.mail.misc
- Subject: Re: timezones
- Date: 29 Dec 92 12:47:13 GMT
- Organization: Technical Research Centre of Finland, Laboratory for Information
- Processing (VTT/TIK)
- Lines: 54
- Message-ID: <TML.92Dec29144713@tiuhti.tik.vtt.fi>
- References: <BzzyL0.K8@newsserver.technet.sg> <1hpf2sINNqf4@mailgzrz.TU-Berlin.DE>
- NNTP-Posting-Host: tiuhti.tik.vtt.fi
- In-reply-to: elsn4000@bronto.zrz.tu-berlin.de's message of 29 Dec 1992 12:07:56 GMT
-
- >>>>> On 29 Dec 1992 12:07:56 GMT, elsn4000@bronto.zrz.tu-berlin.de (Frank Elsner) said:
- > In article <BzzyL0.K8@newsserver.technet.sg> swispl@solomon.technet.sg (SW International) writes:
- >>2) I'm looking for a list of *official* timezones, as valid in mail
- >> and/or elsewhere. Is there a ftp-site for this?
- > Here is what I have on this topic, hope it helps.
-
- > -0100 WAT West Africa Time
- > -0200 AT Azores Time
- > ...
-
- You should definitely *not* use exotic time zone names such as these.
-
- The official words from the Hosts Requirements RFC:
-
- There is a strong trend towards the use of numeric timezone
- indicators, and implementations SHOULD use numeric timezones
- instead of timezone names. However, all implementations MUST
- accept either notation. If timezone names are used, they MUST
- be exactly as defined in RFC-822.
-
- And the timezone names in RFC822 are:
-
- zone = "UT" / "GMT" ; Universal Time
- ; North American : UT
- / "EST" / "EDT" ; Eastern: - 5/ - 4
- / "CST" / "CDT" ; Central: - 6/ - 5
- / "MST" / "MDT" ; Mountain: - 7/ - 6
- / "PST" / "PDT" ; Pacific: - 8/ - 7
- / 1ALPHA ; Military: Z = UT;
- ; A:-1; (J not used)
- ; M:-12; N:+1; Y:+12
- / ( ("+" / "-") 4DIGIT ) ; Local differential
- ; hours+min. (HHMM)
-
- Time zone may be indicated in several ways. "UT" is Univer-
- sal Time (formerly called "Greenwich Mean Time"); "GMT" is per-
- mitted as a reference to Universal Time. The military standard
- uses a single character for each zone. "Z" is Universal Time.
- "A" indicates one hour earlier, and "M" indicates 12 hours ear-
- lier; "N" is one hour later, and "Y" is 12 hours later. The
- letter "J" is not used. The other remaining two forms are taken
- from ANSI standard X3.51-1975. One allows explicit indication of
- the amount of offset from UT; the other uses common 3-character
-
- But note that the Hosts Requeirements say:
-
- The military time zones are specified incorrectly in RFC-822:
- they count the wrong way from UT (the signs are reversed). As
- a result, military time zones in RFC-822 headers carry no
- information.
- --
- Tor Lillqvist,
- working, but not speaking, for the Technical Research Centre of Finland,
- Laboratory for Information Processing (VTT/TIK).
-