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Info on timechanges in Sweden
by Ivan Nilsson April 13, 2001

April 13, 2001

I'd like to make a contribution to the timechanges in Sweden found in your timezone file. Sweden has never had the Mean Time of Stockholm as national Standard Time, and never switched to/from summertime at 1:00 from 1980 onwards. The correct entries are: GMTOFF RULES FORMAT [UNTIL] 1:12:12 LMT 1879 (1878 May 31 is incorrect) 1:00:14 SEST 1900 (change at 01:00 is incorrect) # Sweden Standard Time 1:00:00 CET 1916 May 14 23:00 (April 14 is incorrect) 1:00:00 1:00 CEST 1916 I'm not sure about this, see explanation below. All of the above is stated in lawtexts (unfortunately I have only found them in Swedish). The law "Svensk författningssamling 1878, no 14" about standard time in 1879: >From the beginning of 1879 (that is January 1 0:00) the time for all places in the country is "the mean solar time for the meridian at three degrees, or twelve minutes of time, to the west of the meridian of the Observatory of Stockholm". The law is dated 31 May 1878. The observatory at that time had the meridian 18 degrees 03' 30" eastern longitude = 1 hour 12 minutes 14 seconds in time. Less 12 minutes give the national standard time as 1 hour 00 minutes 14 seconds ahead of GMT. (The observatory is in the centre of Stockholm.) I suggest SEST rather than SST or ST because other time standards already use them (SE = the internation code for Sweden). About the beginning of CET in Sweden. The lawtext ("Svensk författningssamling 1899, no 44") states, that "from the beginning of 1900... ... the same as the mean solar time for the meridian at the distance of one hour of time from the meridian of the English observatory at Greenwich, or at 12 minutes 14 seconds to the west from the meridan of the Observatory of Stockholm". The law is dated 16 June 1899. In short: At 0:00:00 January 1 1900 the new standard time i Sweden is 1:00:00 ahead of GMT. I have photo copies of these laws. If you like I can scan them and mail them to you. Now the summertimes. 1916: The lawtext ("Svensk författningssamling 1916, no 124") states, that "May 15 1916 is considered to begin one hour earlier". It is pretty obviuos that at 23:00 May 14 the clocks are set to 0:00 May 15 (thus the timezone file is correct). Further the law says, that "September 30 1916 is considered to end one our later". This is a most ambigous statement. One way to interprete this: At 0:00 October 1 the clocks are set back to 23:00 Sept 30. But in practice it appears that the changes somehow involved 1:00 on October 1. A news report I recently found is not clear on what exactly happened except that 1:00 October 1 is involved. The text report about trains standing still for one hour in the night and is written in a way that invistes two interpretations: 1. At 0:00 October 1 the trains stop and stand still for one hour, and then the clock is set to 0:00 summertime October 1 and the trains continue the journey. 2. At 1:00 October 1 the trains stop, the clock is set back to 0:00, and when it again is 1:00 summertime the trains move again. I am sorry I have not been able to get this matter crystal clear. I live close to a university so I hope I will able able to find sometime more useful there. The rules given in the timezone file for the summertimes from 1980 onwards have the correct dates, but I am afraid the times are incorrect. The laws regulating summertime explicitly states that, when summertime begins, the clocks are set forward from 2:00 to 3:00 in the night. When summertime ends, the clocks are set back from 3:00 to 2:00 in the night. So, the time 1:00:00 is in no way involved in the summertime changes in Sweden nowadays. The laws regulating this are available on the site of the Swedish Parliament beginning with 1985 - the laws regulating 1980 - 1984 is not available on the site (to my knowledge they are only available in Swedish): http://www.riksdagen.se/english/work/sfst.asp (type "sommartid" without the quotes in the field "Fritext" and then click the Sök-button). I really appreciate your excellent work compiling all that time information from all around the world. /Ivan Nilsson

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Time Lord
by Olson, Arthur David (NCI) April 12, 2001

April 12, 2001

April 10, 2001 was the United States release date for "Time Lord: Sir Sandford Fleming and the Creation of Standard Time" by Clark Blaise. It was reviewed in Discover magazine, so expect ready availability (there were two copies in the Friendship Heights DC Borders when I visited). Presumably Fleming's fellow Canadian William Shatner will take the lead role in the big-screen version. --ado

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How to Upgrade tzdata and tzcode into a unix server
by francois reygagne April 11, 2001

April 11, 2001

I would like to upgrade the tzdata and tzcode automatically into my server for each upgrade of the olson tz data to prevent from bad local_time calculation. I would like to make my server know that a new release of tzdata/tzcode is available and make it load the new tzdata release and override the previous. Please, let me know how to do that ? -- François REYGAGNE. Software Architect. opt[e]way S.A., 2881 route des Crêtes, BP308 06906 Sophia Antipolis Cedex, FRANCE tél: +33 (0)4 92 95 27 01 http://www.opteway.com

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Convert local time to gmt time without using TZ Env variable
by francois reygagne April 11, 2001

April 11, 2001

The ftcs unix mktime use the function tzset to initialize time conversion information by setting an environment variable. That is not thread-safe. As I want to work in multi_threaded design with different time-zone, one per each thread, I can't use the unix standard fonctions like mktime. I need a thread-safe function that converts a local-time attached to its timezone into a GMT time as follow: void localtime_to_gmt(const char * timezone, const struct tm localtime, time_t * gmt_time); The right way to do that is to change TZ, but that is not thread-safe Is it feasible to recode (public-domain) Olson timezone sources to use an explicit state parameter rather than relying on global variables ? Is there a free software portable to Linux RedHat, OSF Tru64, HP_UX and Sun Solaris 5.8 using olson tzdata which can do that ? Is there someone who knows the design or have a design document relative to olson software to help me. François REYGAGNE. Software Architect. opt[e]way S.A., 2881 route des Crêtes, BP308 06906 Sophia Antipolis Cedex, FRANCE tél: +33 (0)4 92 95 27 01 http://www.opteway.com -- François REYGAGNE. Software Architect. opt[e]way S.A., 2881 route des Crêtes, BP308 06906 Sophia Antipolis Cedex, FRANCE tél: +33 (0)4 92 95 27 01 http://www.opteway.com

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RE: Reuters on Mexican DST
by Jesper Nørgaard April 11, 2001

April 11, 2001

Note that there is another link about the decision to nullify Andrés Miguel López Obrador decree to abandon DST in Distrito Federal: http://dailynews.yahoo.com/h/ap/20010407/wl/clock_confusion_1.html Regards, Jesper Nørgaard Welen Email: jnorgard(a)Prodigy.Net.mx Programador/Analista CIMMYT - Centro Internacional de Mejoramiento de Maíz y Trigo Dirección: CIMMYT Int. c/o Jesper Nørgaard Km. 45, Carretera México-Veracruz El Batán Texcoco, Edo. de México CP 56130 MEXICO Tel.: +52 (5) 58-04-20-04 ext. 1374 Fax: +52 (5) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 CIMMYT home page: http://cimmyt.cgiar.org Check out my free program World Time Explorer: http://timezone50.homepage.com ---------- From: Olson, Arthur David (NCI)[SMTP:olsona@dc37a.nci.nih.gov] Sent: Martes 10 de Abril de 2001 12:00 To: tz (E-mail) Cc: 'mikebw(a)colossus.bilow.com' Subject: Reuters on Mexican DST Mike Bilow (mikebw(a)colossus.bilow.com) sent along word of a Reuters item on Mexican DST; see http://dailynews.yahoo.com/h/nm/20010410/od/mexico_timechange_dc_1.html for details (and note the copyright notice at the end, which is why I don't simply include it here). --ado

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Reuters on Mexican DST
by Olson, Arthur David (NCI) April 10, 2001

April 10, 2001

Mike Bilow (mikebw(a)colossus.bilow.com) sent along word of a Reuters item on Mexican DST; see http://dailynews.yahoo.com/h/nm/20010410/od/mexico_timechange_dc_1.html for details (and note the copyright notice at the end, which is why I don't simply include it here). --ado

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Mexico's Tempest in a Time Change
by Mike Bilow April 10, 2001

April 10, 2001

Yahoo! News Home - Yahoo! - My Yahoo! - News Alerts - Help _________________________________________________________________ Reuters New Media Yahoo! Online Account Access NextCard Internet Visa - Apply Now Home | Top Stories | Business | Tech | Politics | World | Local | Ente rtainment | Sports | Science | Health Oddly Enough Headlines Reuters Tuesday April 10 10:21 AM ET Mexico's Tempest in a Time Change MEXICO CITY (Reuters) - If leftist Mexico City Mayor Andres Manuel Lopez Obrador gets his way, the capital could operate in a different time zone from the rest of the country, out of line even with its own suburbs. With the federal government and mayor's office reportedly locking horns this week in legal maneuvers, many Mexicans fear that if Lopez Obrador prevails there would be chaos for airlines, television broadcasts, school schedules and lunch appointments. Lopez Obrador, who took office late last year, in February decreed clocks would stay put in the capital on May 5 when the rest of the country is scheduled to adopt daylight savings time, moving clocks ahead one hour. The capital of some 9 million people, is part of a greater urban area of some 19 million. So the core of the metropolis would be one hour behind all of its suburbs. Lopez Obrador's government has filed a constitutional challenge to daylight savings in general, before the nation's Supreme Court, arguing that the president does not have power under Mexico's constitution to impose the time change. According to local press reports, this week the government of conservative President Vicente Fox counter-sued, asking the nation's top court to knock down Lopez Obrador's February decree. Mexico adopted the time change in 1996, to put the country in tune with its northern neighbor and biggest trading partner, the United States. But daylight savings has never been popular here. Many argue that it is dangerous for children to walk to school in the dark. And last year in congressional debates, at least one legislator argued that darkness inhibited morning sex. The Supreme Court has promised to issue a resolution on the suit and the counter-suit by May 1, just days before Fox has decreed that the country will move clocks ahead. Email this story - View most popular | Formatted version _________________________________________________________________ _________________________ Search Advanced Search: (_) Stories (_) Photos (_) Full Coverage Home | Top Stories | Business | Tech | Politics | World | Local | Ente rtainment | Sports | Science | Health _________________________________________________________________ Questions or Comments Copyright © 2001 Reuters Limited. All rights reserved. Republication or redistribution of Reuters content is expressly prohibited without the prior written consent of Reuters. Reuters shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon.

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RE: New date and time draft
by Jesper Nørgaard April 10, 2001

April 10, 2001

This work appeals to me a great deal, so this is not really a constructive criticism. I applaud the completely irrefutable arguments to why four-digit dates are a must in internet communication. I just have one question: Does 03-Apr-01 mean third of April 2001 or does it mean first of April 2003 (that would really be an April's Fool with a vengeance). In a few years I might wonder even more ... May you all have a nice day ... Jesper Nørgaard Welen Email: jnorgard(a)Prodigy.Net.mx Programador/Analista CIMMYT - Centro Internacional de Mejoramiento de Maíz y Trigo Dirección: CIMMYT Int. c/o Jesper Nørgaard Km. 45, Carretera México-Veracruz El Batán Texcoco, Edo. de México CP 56130 MEXICO Tel.: +52 (5) 58-04-20-04 ext. 1374 Fax: +52 (5) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 CIMMYT home page: http://cimmyt.cgiar.org Check out my free program World Time Explorer: http://timezone50.homepage.com ---------- From: Olson, Arthur David (NCI)[SMTP:olsona@dc37a.nci.nih.gov] Sent: Lunes 9 de Abril de 2001 7:13 To: tz (E-mail) Subject: FW: New date and time draft Graham Klyne is not on the time zone mailing list; direct replies appropriately. --ado -----Original Message----- From: Graham Klyne [mailto:GK@NineByNine.org] Sent: Friday, April 06, 2001 5:11 AM To: discuss(a)apps.ietf.org; tz(a)elsie.nci.nih.gov Subject: New date and time draft FYI, I've submitted a revision of the date and time draft Chris Newman wrote some time ago. One of the goals for the current revision is to create a separate specification that answers a clear and present requirement from other parts concerning which there is less clear consensus. Specifically, this draft aims to move forward the timestamp elements of Chris' original work, while allowing the trickier "schedule events" elements to be picked up and developed by a group with more specific relevant expertise and goals, if required. #g -- A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Instant Messaging and Presence Protocol Working Group of the IETF. Title : Date and Time on the Internet: Timestamps Author(s) : C. Newman, G. Klyne Filename : draft-ietf-impp-datetime-00.txt Pages : 16 Date : 03-Apr-01 This document defines a date and time format for use in Internet protocols that is a profile of the ISO 8601 [ISO8601] standard for representation of dates and times using the Gregorian calendar. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-impp-datetime-00.txt ------------ Graham Klyne (GK(a)ACM.ORG)

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FW: New date and time draft
by Olson, Arthur David (NCI) April 10, 2001

April 10, 2001

Graham Klyne is not on the time zone mailing list; direct replies appropriately. --ado -----Original Message----- From: Graham Klyne [mailto:GK@NineByNine.org] Sent: Friday, April 06, 2001 5:11 AM To: discuss(a)apps.ietf.org; tz(a)elsie.nci.nih.gov Subject: New date and time draft FYI, I've submitted a revision of the date and time draft Chris Newman wrote some time ago. One of the goals for the current revision is to create a separate specification that answers a clear and present requirement from other parts concerning which there is less clear consensus. Specifically, this draft aims to move forward the timestamp elements of Chris' original work, while allowing the trickier "schedule events" elements to be picked up and developed by a group with more specific relevant expertise and goals, if required. #g -- A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Instant Messaging and Presence Protocol Working Group of the IETF. Title : Date and Time on the Internet: Timestamps Author(s) : C. Newman, G. Klyne Filename : draft-ietf-impp-datetime-00.txt Pages : 16 Date : 03-Apr-01 This document defines a date and time format for use in Internet protocols that is a profile of the ISO 8601 [ISO8601] standard for representation of dates and times using the Gregorian calendar. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-impp-datetime-00.txt ------------ Graham Klyne (GK(a)ACM.ORG)

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Re: New date and time draft
by Chris Newman April 9, 2001

April 9, 2001

Given that my office already purchased ISO 8601:1988 a few years ago, I certainly couldn't justify the cost of purchasing a revision in current tight economic times. If there's a public list of errata (or a free revision available to people who purchased the previous version), I'd be glad to vet the spec against that. Or perhaps if Graham feels like purchasing a copy and vetting the ABNF he could. Otherwise I believe we should keep the reference to the older version since that's what this spec is based on. - Chris --On Monday, April 9, 2001 18:22 +0100 Markus Kuhn <Markus.Kuhn(a)cl.cam.ac.uk> wrote: > But this document still references the old first edition! The one that > counted accidentally minutes from 01 to 60 and similar nonsense, along > with lots of ambiguities: > > [ISO8601] "Data elements and interchange formats -- Information > interchange -- Representation of dates and times", ISO > 8601:1988(E), International Organization for > Standardization, June, 1988. > > The new second edition with lots of bug fixes, ISO 8601:2000, has been > available since December and can be ordered online from > > http://www.iso.ch/cate/d26780.html

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