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FW: Info on timechanges in Sweden
by Olson, Arthur David (NCI) April 20, 2001

April 20, 2001

Ivan Nilsson is not on the time zone mailing list; direct replies appropriately. --ado -----Original Message----- From: Ivan Nilsson [mailto:ivan@spica-it.com] Sent: Friday, April 13, 2001 6:46 PM To: tz(a)elsie.nci.nih.gov Subject: Info on timechanges in Sweden 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 <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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Re: zic.c compilation on OSF Tru64 Works with -std0 option
by francois reygagne April 20, 2001

April 20, 2001

Paul Eggert wrote: > > Date: Tue, 17 Apr 2001 23:55:34 +0200 > > From: francois reygagne <freygagne(a)opteway.com> > > > cc: Error: zic.c, line 415: In the definition of the function "error", the promoted type of string is incompatible with the type of the corresponding parameter in a prior declaration. (promotmatch) > > It sounds like your compiler is broken. You might try using GCC > instead; it should work. Or you can try compiling with __STDC__ > disabled; there may be an option to tell your compiler to compile > in "K&R mode", where __STDC__ is not defined. I just set into the Makefile of tzcode CFLAGS as bellow using cc compiler on OSF Tru64 and it works. I just recall you I'm working on OSF1 V5.0 1094 alpha : #FOR TRU64 It works CFLAGS= -std0 #FOR TRU64 use cc cc= cc Could you upgrade your Makefile to take into account this update needed to complete successfully the tzcode binary generation for tyhe compaq OSF Tru64. -- 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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FW: time zone browsing tools
by Olson, Arthur David (NCI) April 19, 2001

April 19, 2001

Neal McBurnett is not on the time zone mailing list; direct replies appropriately. --ado -----Original Message----- From: Neal McBurnett [mailto:nealmcb@avaya.com] Sent: Thursday, April 19, 2001 5:16 PM To: tz(a)elsie.nci.nih.gov Subject: time zone browsing tools I found tzselect in tzcode, and it is very handy, along with the data files that it uses. But I don't see any tools that use the latitude/longitude info in the zone.tab file. Surely after putting all the effort to gather the info, someone has something to use it. What am I missing? I'm also looking for a tool to use the historical data. tzconvert.cgi is very nice, but it suffers from the Unix epochal restrictions and doesn't work before 1970 or after about 2037. Is there any other software that can handle other dates? Perhaps a little Java app? Cheers, Neal McBurnett <neal(a)bcn.boulder.co.us> 303-538-4852 http://bcn.boulder.co.us/~neal/ (with GPG/PGP keys) Avaya Inc: http://www.avaya.com/

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time zone browsing tools
by Neal McBurnett April 19, 2001

April 19, 2001

I found tzselect in tzcode, and it is very handy, along with the data files that it uses. But I don't see any tools that use the latitude/longitude info in the zone.tab file. Surely after putting all the effort to gather the info, someone has something to use it. What am I missing? I'm also looking for a tool to use the historical data. tzconvert.cgi is very nice, but it suffers from the Unix epochal restrictions and doesn't work before 1970 or after about 2037. Is there any other software that can handle other dates? Perhaps a little Java app? Cheers, Neal McBurnett <neal(a)bcn.boulder.co.us> 303-538-4852 http://bcn.boulder.co.us/~neal/ (with GPG/PGP keys) Avaya Inc: http://www.avaya.com/

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finding tz-link.htm and other documentation....
by Neal McBurnett April 19, 2001

April 19, 2001

Thanks to you all for a great database and set of tools! I found your ftp site pretty easily, but it took a surprisingly long time for me to find the best information, i.e. tz-link.htm, buried in the tzcode.tar.gz. It isn't mentioned directly at the FTP site, in the tzcode README, or anywhere at all in any of the tzdata files. I read all the man pages, etc. and just didn't get to tz-link.htm until I had played on-and-off for a few days. Of course it might have occurred to me that a .htm file would be useful, but the name just didn't grab me. To aid future explorers (especially those without tar, etc), could you keep the latest copy of tz-link.htm on the cannonical ftp site at ftp://elsie.nci.nih.gov/pub/ and mention it in the tzcode README file? The tzdata database itself never mentions the ftp site at all. It would be helpful to either include a tiny README, or a comment in each tzdata file, to point to the ftp site and tz-link.htm. A README at the ftp site would be handy to indicate what all the other files there are. Finally, tzselect is also a useful solution to a common problem, and should be mentioned in tz-link.htm and the README, I think. Thanks again, Neal McBurnett <nealmcb(a)avaya.com> 303-538-4852 Denver http://bcn.boulder.co.us/~neal/ (with GPG/PGP keys) Avaya Inc: http://www.avaya.com/

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Chatham Islands
by Ivan Nilsson April 19, 2001

April 19, 2001

I have found this on the Chatham Islands: >From http://www.nzhistory.net.nz/Links/time.htm "...During the Second World War, clocks were advanced 1/2 an hour in New Zealand for the duration of the War from 1941. This advance of time was made permanent in 1946 by the Standard Time Act 1945. The Act provides that the time at the meridian 180°E was adopted as the basis for New Zealand Time. The new Act put into effect New Zealand Standard Time which was permanently 1/2 an hour ahead of New Zealand Mean Time as determined in 1868 and 12 hours in advance of Greenwich Mean Time or Universal Time. (The Chatham Islands was 45 minutes in advance of New Zealand Mean Time under the new Act)..." My comment: It seems strange that Chatham Islands time refers to MZ Mean Time while NZ has abandoned Mean Time and now is on Standard Time. >From http://www.astrologyhouse.co.nz/timechanges.htm "...First mention of the Chatham Islands (850km east of Christchurch) was made in the Standard Time Amendment Act 1956 which states that "The time for general purposes in the Chatham Islands shall be forty-five minutes in advance of NZ standard time". This Act is effective from 1 January 1957. The Time Act 1974 defines daylight time in the Chatham Islands as being 1 hour 45 minutes in advance of New Zealand standard time..." /Ivan Nilsson

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Chatham Island
by Ivan Wilhelm April 19, 2001

April 19, 2001

I have found this on the Chatham Islands: >From http://www.nzhistory.net.nz/Links/time.htm "...During the Second World War, clocks were advanced 1/2 an hour in New Zealand for the duration of the War from 1941. This advance of time was made permanent in 1946 by the Standard Time Act 1945. The Act provides that the time at the meridian 180°E was adopted as the basis for New Zealand Time. The new Act put into effect New Zealand Standard Time which was permanently 1/2 an hour ahead of New Zealand Mean Time as determined in 1868 and 12 hours in advance of Greenwich Mean Time or Universal Time. (The Chatham Islands was 45 minutes in advance of New Zealand Mean Time under the new Act)..." My comment: It seems strange that Chatham Islands time refers to MZ Mean Time while NZ has abandoned Mean Time and now is on Standard Time. >From http://www.astrologyhouse.co.nz/timechanges.htm "...First mention of the Chatham Islands (850km east of Christchurch) was made in the Standard Time Amendment Act 1956 which states that "The time for general purposes in the Chatham Islands shall be forty-five minutes in advance of NZ standard time". This Act is effective from 1 January 1957. The Time Act 1974 defines daylight time in the Chatham Islands as being 1 hour 45 minutes in advance of New Zealand standard time..." /Ivan Nilsson

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Chatham Island
by Ivan Wilhelm April 19, 2001

April 19, 2001

I have found this on the Chatham Islands: >From http://www.nzhistory.net.nz/Links/time.htm "...During the Second World War, clocks were advanced 1/2 an hour in New Zealand for the duration of the War from 1941. This advance of time was made permanent in 1946 by the Standard Time Act 1945. The Act provides that the time at the meridian 180°E was adopted as the basis for New Zealand Time. The new Act put into effect New Zealand Standard Time which was permanently 1/2 an hour ahead of New Zealand Mean Time as determined in 1868 and 12 hours in advance of Greenwich Mean Time or Universal Time. (The Chatham Islands was 45 minutes in advance of New Zealand Mean Time under the new Act)..." My comment: It seems strange that Chatham Islands time refers to MZ Mean Time while NZ has abandoned Mean Time and now is on Standard Time. >From http://www.astrologyhouse.co.nz/timechanges.htm "...First mention of the Chatham Islands (850km east of Christchurch) was made in the Standard Time Amendment Act 1956 which states that "The time for general purposes in the Chatham Islands shall be forty-five minutes in advance of NZ standard time". This Act is effective from 1 January 1957. The Time Act 1974 defines daylight time in the Chatham Islands as being 1 hour 45 minutes in advance of New Zealand standard time..." /Ivan Nilsson

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Re: List of time zones compliant both for Linux, Solaris 5.8, OSF1 Tru64, HP-UX
by Greg Black April 19, 2001

April 19, 2001

| All the systems that you mention should read the Olson data files | as-is; you shouldn't need to link any of the tz code. Which leads to the question: under what circumstances would you want to use the Olson tz code?

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To compile successfully copy /tzdata2001A/yearistype.sh to tzcode2001a
by francois reygagne April 19, 2001

April 19, 2001

Could you fix this trouble by changing the target name yearstype.sh or copying it as I did into tzcode directory 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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