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Be less enthusiastic about Shanks and clarify UT vs UTC.
* africa, asia, australasia, backzone, europe, northamerica: * southamerica, tz-link.htm: Be less enthusiastic about Shanks. * tz-link.htm: Be clearer about UT vs UTC. * NEWS: Document this.
This commit is contained in:
Paul Eggert
5
NEWS
5
NEWS
@ -10,6 +10,11 @@ Unreleased, experimental changes
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longer guess that Pyongyang mimicked Seoul time after World War II,
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as this is politically implausible.
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Changes affecting commentary
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The commentary is less enthusiastic about Shanks as a source,
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and is more careful to distinguish UT from UTC.
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Release 2014i - 2014-10-21 22:04:57 -0700
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9
africa
9
africa
@ -8,18 +8,17 @@
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# From Paul Eggert (2013-02-21):
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#
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# A good source for time zone historical data outside the U.S. is
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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# Unfortunately this book contains many errors and cites no sources.
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#
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# Gwillim Law writes that a good source
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# for recent time zone data is the International Air Transport
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# Association's Standard Schedules Information Manual (IATA SSIM),
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# published semiannually. Law sent in several helpful summaries
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# of the IATA's data after 1990.
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#
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# Except where otherwise noted, Shanks & Pottenger is the source for
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# entries through 1990, and IATA SSIM is the source for entries afterwards.
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# of the IATA's data after 1990. Except where otherwise noted,
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# IATA SSIM is the source for entries after 1990.
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#
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# Another source occasionally used is Edward W. Whitman, World Time Differences,
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# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
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11
asia
11
asia
@ -6,20 +6,19 @@
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# tz@iana.org for general use in the future). For more, please see
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# the file CONTRIBUTING in the tz distribution.
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# From Paul Eggert (2013-08-11):
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# From Paul Eggert (2014-10-31):
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#
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# A good source for time zone historical data outside the U.S. is
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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# Unfortunately this book contains many errors and cites no sources.
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#
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# Gwillim Law writes that a good source
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# for recent time zone data is the International Air Transport
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# Association's Standard Schedules Information Manual (IATA SSIM),
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# published semiannually. Law sent in several helpful summaries
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# of the IATA's data after 1990.
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#
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# Except where otherwise noted, Shanks & Pottenger is the source for
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# entries through 1990, and IATA SSIM is the source for entries afterwards.
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# of the IATA's data after 1990. Except where otherwise noted,
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# IATA SSIM is the source for entries after 1990.
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#
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# Another source occasionally used is Edward W. Whitman, World Time Differences,
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# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
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12
australasia
12
australasia
@ -797,19 +797,19 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
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# tz@iana.org for general use in the future). For more, please see
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# the file CONTRIBUTING in the tz distribution.
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# From Paul Eggert (2013-02-21):
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# A good source for time zone historical data outside the U.S. is
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# From Paul Eggert (2014-10-31):
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#
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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# Unfortunately this book contains many errors and cites no sources.
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#
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# Gwillim Law writes that a good source
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# for recent time zone data is the International Air Transport
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# Association's Standard Schedules Information Manual (IATA SSIM),
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# published semiannually. Law sent in several helpful summaries
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# of the IATA's data after 1990.
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#
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# Except where otherwise noted, Shanks & Pottenger is the source for
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# entries through 1990, and IATA SSIM is the source for entries afterwards.
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# of the IATA's data after 1990. Except where otherwise noted,
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# IATA SSIM is the source for entries after 1990.
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#
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# Another source occasionally used is Edward W. Whitman, World Time Differences,
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# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
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5
backzone
5
backzone
@ -24,11 +24,10 @@
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# replaced by links as their data entries were questionable and/or they
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# differed from other zones only in pre-1970 time stamps.
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# Unless otherwise specified, the source for the data is the following,
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# which does not itself cite sources and is often wrong:
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#
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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# Unfortunately this book contains many errors and cites no sources.
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# This file is not intended to be compiled standalone, as it
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# assumes rules from other files. In the tz distribution, use
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9
europe
9
europe
@ -6,16 +6,19 @@
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# tz@iana.org for general use in the future). For more, please see
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# the file CONTRIBUTING in the tz distribution.
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# From Paul Eggert (2014-05-31):
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# A good source for time zone historical data outside the U.S. is
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# From Paul Eggert (2014-10-31):
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#
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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# Unfortunately this book contains many errors and cites no sources.
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#
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# Gwillim Law writes that a good source
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# for recent time zone data is the International Air Transport
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# Association's Standard Schedules Information Manual (IATA SSIM),
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# published semiannually. Law sent in several helpful summaries
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# of the IATA's data after 1990.
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# of the IATA's data after 1990. Except where otherwise noted,
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# IATA SSIM is the source for entries after 1990.
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#
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# A reliable and entertaining source about time zones is
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# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
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12
northamerica
12
northamerica
@ -991,19 +991,19 @@ Zone America/Menominee -5:50:27 - LMT 1885 Sep 18 12:00
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################################################################################
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# From Paul Eggert (2006-03-22):
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# A good source for time zone historical data outside the U.S. is
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# From Paul Eggert (2014-10-31):
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#
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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# Unfortunately this book contains many errors and cites no sources.
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#
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# Gwillim Law writes that a good source
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# for recent time zone data is the International Air Transport
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# Association's Standard Schedules Information Manual (IATA SSIM),
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# published semiannually. Law sent in several helpful summaries
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# of the IATA's data after 1990.
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#
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# Except where otherwise noted, Shanks & Pottenger is the source for
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# entries through 1990, and IATA SSIM is the source for entries afterwards.
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# of the IATA's data after 1990. Except where otherwise noted,
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# IATA SSIM is the source for entries after 1990.
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#
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# Other sources occasionally used include:
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#
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18
southamerica
18
southamerica
@ -6,23 +6,23 @@
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# tz@iana.org for general use in the future). For more, please see
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# the file CONTRIBUTING in the tz distribution.
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# From Paul Eggert (2006-03-22):
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# A good source for time zone historical data outside the U.S. is
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# From Paul Eggert (2014-10-31):
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#
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# Unless otherwise specified, the source for data through 1990 is:
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# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
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# San Diego: ACS Publications, Inc. (2003).
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#
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# For data circa 1899, a common source is:
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# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
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# http://www.jstor.org/stable/1774359
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# Unfortunately this book contains many errors and cites no sources.
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#
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# Gwillim Law writes that a good source
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# for recent time zone data is the International Air Transport
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# Association's Standard Schedules Information Manual (IATA SSIM),
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# published semiannually. Law sent in several helpful summaries
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# of the IATA's data after 1990.
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# of the IATA's data after 1990. Except where otherwise noted,
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# IATA SSIM is the source for entries after 1990.
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#
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# Except where otherwise noted, Shanks & Pottenger is the source for
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# entries through 1990, and IATA SSIM is the source for entries afterwards.
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# For data circa 1899, a common source is:
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# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
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# http://www.jstor.org/stable/1774359
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#
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# Earlier editions of these tables used the North American style (e.g. ARST and
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# ARDT for Argentine Standard and Daylight Time), but the following quote
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37
tz-link.htm
37
tz-link.htm
@ -8,7 +8,7 @@
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<meta http-equiv="Content-type" content='text/html; charset="UTF-8"'>
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<meta name="DC.Creator" content="Eggert, Paul">
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<meta name="DC.Contributor" content="Olson, Arthur David">
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<meta name="DC.Date" content="2014-10-21">
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<meta name="DC.Date" content="2014-10-31">
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<meta name="DC.Description"
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content="Sources of information about time zones and daylight saving time">
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<meta name="DC.Identifier"
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@ -26,9 +26,7 @@ that represent the history of local time
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for many representative locations around the globe.
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It is updated periodically to reflect changes made by political bodies
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to <a href="http://en.wikipedia.org/wiki/Time_zone">time zone</a>
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boundaries, <a
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href="http://en.wikipedia.org/wiki/Coordinated_Universal_Time"><abbr
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title="Coordinated Universal Time">UTC</abbr></a> offsets, and
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boundaries and
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<a href="http://en.wikipedia.org/wiki/Daylight_saving">daylight-saving</a>
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rules.
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This database (often called <code>zoneinfo</code> or
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@ -65,7 +63,7 @@ title="Virtual Memory System">VMS</abbr></a>,
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X</abbr></a>, and
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<a href="http://oracle.com/solaris">Solaris</a>.</p>
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<p>
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Each location in the database represents a national region where all
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Each location in the database represents a region where all
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clocks keeping local time have agreed since 1970.
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Locations are identified by continent or ocean and then by the name of
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the location, which is typically the largest city within the region.
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@ -86,6 +84,18 @@ implementation set the <code><abbr>TZ</abbr></code>
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environment variable to the location's full name,
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e.g., <code><abbr>TZ</abbr>="America/New_York"</code>.</p>
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<p>
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Associated with each region is a history of offsets from
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<a href="http://en.wikipedia.org/wiki/Universal_Time">Universal
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Time</a> (<abbr>UT</abbr>), which is <a
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href="http://en.wikipedia.org/wiki/Greenwich_Mean_Time">Greenwich Mean
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Time</a> (<abbr>GMT</abbr>) with days beginning at midnight;
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for time stamps after 1960 this is more precisely <a
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href="http://en.wikipedia.org/wiki/Coordinated_Universal_Time">Coordinated
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Universal Time</a> (<abbr>UTC</abbr>).
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The database also records when daylight saving time was in use,
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along with alphabetic time zone abbreviations such as <abbr>EST</abbr>
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for Eastern Standard Time in the <abbr>US</abbr>.</p>
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<p>
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In the <code><abbr>tz</abbr></code> database's
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<a href="ftp://ftp.iana.org/tz/releases/"><abbr
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title="File Transfer Protocol">FTP</abbr> releases</a>
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@ -297,8 +307,8 @@ license.</li>
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<abbr>API</abbr> is upward compatible with standard JavaScript
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Dates. It is freely available under the Apache License.</li>
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<li><a href="https://github.com/sproutsocial/walltime-js">Walltime-js</a>
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translates UTC to local time. It is freely available under the <abbr>MIT</abbr>
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license.</li>
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translates <abbr>UT</abbr> to local time. It is freely available under
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the <abbr>MIT</abbr> license.</li>
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</ul>
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<li><a href="http://pytz.sourceforge.net">pytz – World Timezone
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Definitions for Python</a> compiles <code><abbr>tz</abbr></code> source into
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@ -336,7 +346,8 @@ This library is freely available under the
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and is widely used in <abbr>GNU</abbr>/Linux systems.</li>
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<li><a href="http://www.gnome.org/">GNOME</a>'s Glib has
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a <code><abbr>tz</abbr></code> binary file reader written in C that
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creates a <code>GTimeZone</code> object representing sets of UTC offsets.
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creates a <code>GTimeZone</code> object representing sets
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of <abbr>UT</abbr> offsets.
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It is freely available under the <abbr>LGPL</abbr>.</li>
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<li><a href="http://bmsi.com/java/#TZ">ZoneInfo.java</a>
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is a <code><abbr>tz</abbr></code> binary file reader written in Java.
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@ -432,7 +443,10 @@ href="http://www.astrocom.com/astrology/books/american-atlas">one volume
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for the <abbr>US</abbr></a>, and <a
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href="http://www.astrocom.com/astrology/books/international-atlas">one for
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other locations</a>) by <a
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href="http://astrocom.com/">Astro Computing Services</a>.</li>
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href="http://astrocom.com/">Astro Computing Services</a>.
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These atlases are extensive but unreliable, as Shanks appears to have
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guessed many <abbr>UT</abbr> offsets and transitions. The atlases cite no
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sources and do not indicate which entries are guesswork.</li>
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<li><a href="http://www.hp.com/go/hpux/">HP-UX</a> has a database in
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its own <code>tztab</code>(4) format.</li>
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<li>Microsoft Windows has proprietary data mentioned above.</li>
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@ -626,9 +640,8 @@ specifies a <a
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href="http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol"><abbr>DHCP</abbr></a>
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option for a server to configure
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a client's time zone and daylight saving settings automatically.</li>
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<li><a href="http://gauss.gge.unb.ca/GMT.UT.and.the.RGO.html">A Few
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Facts Concerning <abbr title="Greenwich Mean Time">GMT</abbr>, <abbr
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title="Universal Time">UT</abbr>, and
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<li><a href="http://gauss.gge.unb.ca/GMT.UT.and.the.RGO.html">A Few Facts
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Concerning <abbr>GMT</abbr>, <abbr>UT</abbr>, and
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the <abbr title="Royal Greenwich Observatory">RGO</abbr></a>
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answers questions like "What is the
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difference between <abbr>GMT</abbr> and <abbr>UTC</abbr>?"</li>
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