2003-07-13 15:21:46 +00:00
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<TITLE>Time zone information (TZUTC).</TITLE>
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<PRE>
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**********************************************************************
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FTSC FIDONET TECHNICAL STANDARDS COMMITTEE
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**********************************************************************
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Publication: FTS-4008
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Revision: 2
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Title: Time zone information (TZUTC)
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Author: FTSC
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Issue Date: 16 May 2003
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Review Date: 16 May 2005
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Obsoletes: FTS-0010.001
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----------------------------------------------------------------------
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Contents:
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1. Introduction
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2. Scope
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3. Current practice
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4. Control paragraph specification
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5. Time zone table
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6. Examples
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A. References
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B. History
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----------------------------------------------------------------------
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Status of this document
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-----------------------
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This document is a Fidonet Technical Standard (FTS), issued by the
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FTSC for the benefit of the Fidonet community.
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This document is based on the FSP-1001 proposal by Odinn Sorensen,
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2:236/77.
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This document is released to the public domain, and may be used,
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copied or modified for any purpose whatsoever.
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1. Introduction
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---------------
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Current practice in FidoNet is to transmit message times in local
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time. This document specifies a standard for transmission of time
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zone information in FidoNet messages, in the form of a control
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paragraph (also known as a "control line" or "kludge") named TZUTC.
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2. Scope
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--------
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This standard is specified for the transmission of FidoNet messages
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in any form where time zone information is not integrated into the
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transport format, specifically any form where the information would
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be lost if not transmitted in a control paragraph, eg. Type 2 packed
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messages. [1]
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3. Current practice
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-------------------
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Some control paragraphs already exist to specify the time zone of
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messages, notably "TZUTC" and "TZUTCINFO". From observations of
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these control paragraphs in actual messages, TZUTC and TZUTCINFO are
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identical except for the name. TZUTCINFO is probably named after
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the JAM message base's [2] subfield of the same name.
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This document adopts the TZUTC control paragraph because is the
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shortest ("TZUTC" vs "TZUTCINFO"). However, software
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implementations should be prepared to read and interpret the
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TZUTCINFO control paragraph as well.
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The TZUTC control paragraph is inserted before the message body
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upon initial message creation, or export from a format containing
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time zone information, such as the aforementioned JAM message base.
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4. Control paragraph specification
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-----------------------------
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Messages which conform to this specification must add the following
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control paragraph:
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^aTZUTC: <current offset from UTC>
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Where ^a is ASCII 1, 01h.
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The offset has the format <[-]hhmm>, where hhmm is the number of
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hours and minutes, zero-padded to two digits each, that local time
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is offset from UTC. If local time is WEST of UTC, then the offset
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is NEGATIVE. See the table below for typical offsets.
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Note that the hh in a time zone offset is not limited to a maximum
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of 12. This is because the International Date Line does not run
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exactly along the boundary between zone -1200 and +1200. The
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minutes part is 00 for most time zones.
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All four digits must be present. If the offset is negative, there
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must be a minus ('-', ASCII 45, 2Dh) in front of the offset.
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Implementations must NOT put a plus ('+', ASCII 43, 2Bh) in front of
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the offset for positive numbers, but robust implementations should
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be prepared to find (and ignore) a plus if it exists.
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If local time changes as a result of, for example, daylight savings
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time, then the offset in the TZUTC control paragraph should change
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to reflect this.
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5. Time zone table
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------------------
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This table gives examples of typical time zones.
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-1000 Alaska-Hawaii Standard Time (United States)
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-0900 Hawaii Daylight Time
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-0800 Pacific Standard Time
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-0700 Pacific Daylight Time
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-0700 Mountain Standard Time
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-0600 Mountain Daylight Time
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-0600 Central Standard Time
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-0500 Central Daylight Time
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-0500 Eastern Standard Time
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-0400 Eastern Daylight Time
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-0400 Atlantic Standard Time
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-0330 Newfoundland Standard Time
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-0300 Atlantic Daylight Time
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-0100 West Africa Time
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0000 Universal Time Coordinated (UTC)
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0000 Greenwich Mean Time
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0100 Central European Time
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0100 British Summer Time
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0200 Central European Summer Time
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0200 Eastern European Time
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0800 Australian Western Standard Time
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0800 China Coast Time
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0900 Japan Standard Time
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0900 Australian Western Daylight Time
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0930 Australian Central Standard Time
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1000 Australian Eastern Standard Time
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1030 Australian Central Daylight Time
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1100 Australian Eastern Daylight Time
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1200 New Zealand Standard Time
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1300 New Zealand Daylight Time
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6. Examples
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-----------
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^aTZUTC: 0000
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^aTZUTC: 0200
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^aTZUTC: -0700
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A. References
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-------------
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[1] "A Basic FidoNet(r) Technical Standard Revision 16", Randy Bush.
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September 1995.
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[2] "The JAM message base proposal", Joaquim Homrighausen, Andrew
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Milner, Mats Birch and Mats Wallin. July 1993.
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B. History
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----------
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Rev.1, 20030409: First release (revised from FSP-1001 by FTSC)
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Rev.2, 20030516: Corrected status; clarified Section 2 on insertion
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position and export practice; fixed terminology.
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**********************************************************************
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</PRE>
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