- tz - lists.iana.org

Brazil - update
by Rodrigo Severo Feb. 3, 2004

Feb. 3, 2004

Hi, The Brazilian National Observatory has recently updated/corrected some info about the 1994/1995 DST. According to the new info available the state of Mato Grosso also had DST in this period. I'm sending here a small patch to include the info in tzdata. I used tzdata2003e as my reference. TIA, Rodrigo Severo -- ---------------------------------------------------- Rodrigo Severo Fábrica de Idéias Fone: +55(61)321 1357 Fax: +55(61)223 1712 SBS - Quadra 2 - Ed. Empire Center - Sala 1301 Brasília/DF - Brasil CEP: 70.070-904 ---------------------------------------------------- diff -cr tzdata2003e/southamerica tzdata2003e.new/southamerica *** tzdata2003e/southamerica 2003-12-15 12:31:42.000000000 -0200 --- tzdata2003e.new/southamerica 2004-02-02 14:51:01.000000000 -0200 *************** *** 536,543 **** # # Mato Grosso (MT) Zone America/Cuiaba -3:44:20 - LMT 1914 - -4:00 Brazil AM%sT 1994 Sep 22 - -4:00 - AMT 1995 Sep 14 -4:00 Brazil AM%sT 2003 Sep 24 -4:00 - AMT # --- 536,541 ----

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FW: Brazil DST data for 2004
by Olson, Arthur David (NIH/NCI) Feb. 2, 2004

Feb. 2, 2004

Otavio Exel is not on the time zone mailing list; direct replies appropriately. --ado -----Original Message----- From: Otavio Exel [mailto:oexel@economatica.com.br] Sent: Friday, January 30, 2004 1:42 PM To: tz(a)lecserver.nci.nih.gov Subject: Brazil DST data for 2004 Dear TZ, According to http://pcdsh01.on.br/HvInic03.htm DST here in Brazil ends on 2004-02-15 00:00:00 []s, -- Otavio Exel /<\oo/>\ oexel(a)economatica.com.br

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Brazil DST data for 2004
by Otavio Exel Jan. 30, 2004

Jan. 30, 2004

Dear TZ, According to http://pcdsh01.on.br/HvInic03.htm DST here in Brazil ends on 2004-02-15 00:00:00 []s, -- Otavio Exel /<\oo/>\ oexel(a)economatica.com.br

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FW: Time Zone: Malaysia & Singapore
by Olson, Arthur David (NIH/NCI) Jan. 28, 2004

Jan. 28, 2004

Mok Ly Yng is not on the time zone mailing list; direct replies appropriately. --ado -----Original Message----- From: Mok Ly Yng [mailto:lymok@starhub.net.sg] Sent: Friday, January 23, 2004 9:01 AM To: tz(a)lecserver.nci.nih.gov Subject: Time Zone: Malaysia & Singapore Hi there, I am Mok Ly Yng. I found my name mentioned in the latest version of the tz data file. I have added a few other points to the Malaysia and Singapore time zone info. These are marked in blue. For both Malaysia and Singapore, for many years in the past versions of this file, the first date was listed as 'Until 1880'. This was the date which prompted my research into the history of legal time in Singapore and Malaysia. It turned out that '1880' was the founding year of Kuala Lumpur. So, it could not have been an 'Until' date. Kuala Lumpur kept its own Local Mean Time of 6:46:46 until it was changed to Singapore's Mean Time on 01 Jan 1901, along with the rest of the other Malay States under British rule. The difference of 2 sec between 6:46:46 and 6:46:48 (as in the original version) was probably due to the rounding off of arc seconds in the longitude value. Singapore was founded in 1819 and had kept different local mean times depending on the different longitude values as determined by different authorities over the years. The only uncertainty remaining is the WWII years of 1942-1945. I am still trying to find out the exact dates of time changes. Regards, Mok ========== # @(#)asia 7.73 # Malaysia # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule NBorneo 1935 1941 - Sep 14 0:00 0:20 TS # one-Third Summer Rule NBorneo 1935 1941 - Dec 14 0:00 0 - # # peninsular Malaysia # From Paul Eggert (2003-11-01): # The data here are taken from Mok Ly Yng (2003-10-30) # <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html> >. # Before 1901, Penang, Malacca and Singapore each had their own time zone; # assume Kuala Lumpur used Malaccan time. [This did not happen. K.L. had its own L.M.T. of 6:46:46 from GMT.] # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Kuala_Lumpur 6:46:46 - LMT 1901 Jan 1 # K.L. Local Mean Time 6:55:25 - SMT 1905 Jun 1 # Singapore M.T. 7:00 - MALT 1933 Jan 1 # Malaya Time 7:00 0:20 MALST 1936 Jan 1 7:20 - MALT 1941 Sep 1 7:30 - MALT 1942 Feb 16 9:00 - JST 1945 Sep 12 7:30 - MALT 1982 Jan 1 8:00 - MYT # Malaysia Time # Singapore # The data here are taken from Mok Ly Yng (2003-10-30) # <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html> >. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Singapore 6:55:25 - LMT 1901 Jan 1 # Local Mean Time 6:55:25 - SMT 1905 Jun 1 # Singapore M.T. 7:00 - MALT 1933 Jan 1 # Malaya Time 7:00 0:20 MALST 1936 Jan 1 7:20 - MALT 1941 Sep 1 7:30 - MALT 1942 Feb 16 9:00 - JST 1945 Sep 12 7:30 - MALT 1965 Aug 9 # independence 7:30 - SGT 1982 Jan 1 # Singapore Time 8:00 - SGT

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DST history
by Helder & Julie Jan. 23, 2004

Jan. 23, 2004

Could you please let me know when Britain, Canada, and Portugal first began using daylight savings time. I have been looking for that information but seem unable to find it. Thank you.

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Time Zone: Malaysia & Singapore
by Mok Ly Yng Jan. 23, 2004

Jan. 23, 2004

Hi there, I am Mok Ly Yng. I found my name mentioned in the latest version of the tz data file. I have added a few other points to the Malaysia and Singapore time zone info. These are marked in blue. For both Malaysia and Singapore, for many years in the past versions of this file, the first date was listed as 'Until 1880'. This was the date which prompted my research into the history of legal time in Singapore and Malaysia. It turned out that '1880' was the founding year of Kuala Lumpur. So, it could not have been an 'Until' date. Kuala Lumpur kept its own Local Mean Time of 6:46:46 until it was changed to Singapore's Mean Time on 01 Jan 1901, along with the rest of the other Malay States under British rule. The difference of 2 sec between 6:46:46 and 6:46:48 (as in the original version) was probably due to the rounding off of arc seconds in the longitude value. Singapore was founded in 1819 and had kept different local mean times depending on the different longitude values as determined by different authorities over the years. The only uncertainty remaining is the WWII years of 1942-1945. I am still trying to find out the exact dates of time changes. Regards, Mok ========== # @(#)asia 7.73 # Malaysia # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule NBorneo 1935 1941 - Sep 14 0:00 0:20 TS # one-Third Summer Rule NBorneo 1935 1941 - Dec 14 0:00 0 - # # peninsular Malaysia # From Paul Eggert (2003-11-01): # The data here are taken from Mok Ly Yng (2003-10-30) # <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html>. # Before 1901, Penang, Malacca and Singapore each had their own time zone; # assume Kuala Lumpur used Malaccan time. [This did not happen. K.L. had its own L.M.T. of 6:46:46 from GMT.] # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Kuala_Lumpur 6:46:46 - LMT 1901 Jan 1 # K.L. Local Mean Time 6:55:25 - SMT 1905 Jun 1 # Singapore M.T. 7:00 - MALT 1933 Jan 1 # Malaya Time 7:00 0:20 MALST 1936 Jan 1 7:20 - MALT 1941 Sep 1 7:30 - MALT 1942 Feb 16 9:00 - JST 1945 Sep 12 7:30 - MALT 1982 Jan 1 8:00 - MYT # Malaysia Time # Singapore # The data here are taken from Mok Ly Yng (2003-10-30) # <http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html>. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Singapore 6:55:25 - LMT 1901 Jan 1 # Local Mean Time 6:55:25 - SMT 1905 Jun 1 # Singapore M.T. 7:00 - MALT 1933 Jan 1 # Malaya Time 7:00 0:20 MALST 1936 Jan 1 7:20 - MALT 1941 Sep 1 7:30 - MALT 1942 Feb 16 9:00 - JST 1945 Sep 12 7:30 - MALT 1965 Aug 9 # independence 7:30 - SGT 1982 Jan 1 # Singapore Time 8:00 - SGT

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Time Links
by Murray Triplett Jan. 19, 2004

Jan. 19, 2004

Dear Sir or Madam, My name is Murray Triplett, and I am the webmaster of Instatime.com, an informational site established to educate web users of global time zones. With an easy-to-read world map, all time zones are shown in real time on one page, which is perfect for a quick resource or presentation graphic. I would like to link to do a link exchange with your site (http://www.twinsun.com/tz/tz-link.htm) to improve the users' web experience from both of our ends. Please let me know if this is possible, and if you'd like to move forward. Thank you, Murray Triplett Webmaster, InstaTime __________________________________ Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes http://hotjobs.sweepstakes.yahoo.com/signingbonus

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Time and time zones on Mars (draft text)
by Paul Eggert Jan. 19, 2004

Jan. 19, 2004

Wednesday's L.A. Times article by Jia-Rui Chong about JPL workers' wristwatches keeping Martian time prompted me to do a little bit of research about time zones on Mars. I'll eventually propose a patch to the "Theory" file, but thought I'd first submit the following rough draft on this mailing list for comment. ----- Time and time zones on Mars ----- Some people have adjusted their work schedules to fit Mars time. Dozens of special Mars watches were built for Jet Propulsion Laboratory workers who kept Mars time during the Mars Exploration Rovers mission (2004). These timepieces look like normal Seikos and Citizens but use Mars seconds rather than terrestrial seconds. A Mars solar day is called a "sol" and has a mean period equal to about 24 hours 39 minutes 35.244 seconds in terrestrial time. It is divided into a conventional 24-hour clock, so each Mars second equals about 1.02749125 terrestrial seconds. The prime meridian of Mars goes through the center of the crater Airy-0, named in honor of the British astronomer who built the Greenwich telescope that defines Earth's prime meridian. Mean solar time on the Mars prime meridian is called Mars Coordinated Time (MTC). Each landed mission on Mars has adopted a different reference for solar time keeping, so there is no real standard for Mars time zones. For example, the Mars Exploration Rovers mission defined two time zones "Local Solar Time A" and "Local Solar Time B" for its two missions, each zone designed so that its time equals local true solar time at approximately the middle of the nominal mission. Such a "time zone" is not particularly suited for any application other than the mission itself. Many calendars have been proposed for Mars, but none have achieved wide acceptance. Astronomers often use Mars Sol Date (MSD) which is a sequential count of Mars solar days elapsed since about 1873-12-29 12:00 GMT. The tz database does not currently support Mars time, but it is documented here in the hopes that support will be added eventually. Sources: Michael Allison and Robert Schmunk, "Technical Notes on Mars Solar Time as Adopted by the Mars24 Sunclock" <http://www.giss.nasa.gov/tools/mars24/help/notes.html> (2004-01-12). Jia-Rui Chong, "Workdays Fit for a Martian", Los Angeles Times <http://www.latimes.com/la-sci-marstime14jan14,1,3346745.story> (2004-01-14), pp A1, A20-A21.

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IERS Bulletin C 27
by Olson, Arthur David (NIH/NCI) Jan. 15, 2004

Jan. 15, 2004

INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : 33 (0) 1 40 51 22 26 FAX : 33 (0) 1 40 51 22 91 Internet : services.iers(a)obspm.fr Paris, 15 January 2004 Bulletin C 27 To authorities responsible for the measurement and distribution of time INFORMATION ON UTC - TAI NO positive leap second will be introduced at the end of June 2004. The difference between UTC and the International Atomic Time TAI is : from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date. Daniel GAMBIS Director Earth Orientation Center of IERS Observatoire de Paris, France

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Bulletin C number 27
by iers＠hpopa.obspm.fr Jan. 15, 2004

Jan. 15, 2004

INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : 33 (0) 1 40 51 22 26 FAX : 33 (0) 1 40 51 22 91 Internet : services.iers(a)obspm.fr Paris, 15 January 2004 Bulletin C 27 To authorities responsible for the measurement and distribution of time INFORMATION ON UTC - TAI NO positive leap second will be introduced at the end of June 2004. The difference between UTC and the International Atomic Time TAI is : from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date. Daniel GAMBIS Director Earth Orientation Center of IERS Observatoire de Paris, France

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