July 2007 - tz - lists.iana.org

proposed tz change for Latvia, Lithuania
by Paul Eggert 25 May '15

25 May '15

It's March Madness time for daylight-saving rule changes. Here's a proposed change to the tz database to keep up with the latest political development, which affects time stamps starting March 29: * Latvia and Lithuania will not observe DST, starting this year. Thanks to Andrei Ivanov for this info. =================================================================== RCS file: RCS/europe,v retrieving revision 2000.3 retrieving revision 2000.3.0.1 diff -pu -r2000.3 -r2000.3.0.1 --- europe 2000/03/04 15:31:08 2000.3 +++ europe 2000/03/08 17:48:59 2000.3.0.1 @@ -1135,6 +1135,12 @@ Link Europe/Rome Europe/San_Marino # 1997-01-21 on transition to Summer time ... established the same order of # daylight savings time settings as in the States of the European Union. +# From Andrei Ivanov (2000-03-06): +# This year Latvia will not switch to Daylight Savings Time (as specified in +# <a href="http://www.lv-laiks.lv/wwwraksti/2000/071072/vd4.htm"> +# The Regulations of the Cabinet of Ministers of the Rep. of Latvia of +# 29-Feb-2000 (#79)</a>, in Latvian for subscribers only). + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Latvia 1989 1996 - Mar lastSun 2:00s 1:00 S Rule Latvia 1989 1996 - Sep lastSun 2:00s 0 - @@ -1151,7 +1157,8 @@ Zone Europe/Riga 1:36:24 - LMT 1880 3:00 Russia MSK/MSD 1989 Mar lastSun 2:00s 2:00 1:00 EEST 1989 Sep lastSun 2:00s 2:00 Latvia EE%sT 1997 Jan 21 - 2:00 EU EE%sT + 2:00 EU EE%sT 2000 Feb 29 + 2:00 - EET # Liechtenstein # Zone NAME GMTOFF RULES FORMAT [UNTIL] @@ -1178,6 +1185,11 @@ Zone Europe/Vaduz 0:38:04 - LMT 1894 Jun # motion to give up shifting to summer time in spring, as it was # already done by Estonia. +# From Andrei Ivanov (2000-03-06): +# I've heard that Ministers of three Baltic countries on their summit +# somewhere in February decided not to switch to summer time starting from +# this spring. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/Vilnius 1:41:16 - LMT 1880 1:24:00 - WMT 1917 # Warsaw Mean Time @@ -1192,7 +1204,8 @@ Zone Europe/Vilnius 1:41:16 - LMT 1880 2:00 C-Eur EE%sT 1998 2:00 - EET 1998 Mar 29 1:00u 1:00 EU CE%sT 1999 Oct 31 1:00u - 2:00 EU EE%sT + 2:00 EU EE%sT 2000 Feb + 2:00 - EET # Luxembourg # Whitman disagrees with most of these dates in minor ways; go with Shanks.

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Tomsk wrong timezone
by Jesper Norgaard Welen 18 Feb '11

18 Feb '11

A quote from the 'europe' file: # Novosibirskaya oblast'. Zone Asia/Novosibirsk 5:31:40 - LMT 1919 Dec 14 6:00 6:00 - NOVT 1930 Jun 21 # Novosibirsk Time 7:00 Russia NOV%sT 1991 Mar 31 2:00s 6:00 Russia NOV%sT 1992 Jan 19 2:00s 7:00 Russia NOV%sT 1993 May 23 # say Shanks & P. 6:00 Russia NOV%sT # # From Oscar van Vlijmen (2001-08-25): [This region consists of] # Kemerovskaya oblast', Krasnoyarskij kraj, # Tajmyrskij (Dolgano-Nenetskij) avtonomnyj okrug, Tomskaya oblast', # Respublika Tuva, Respublika Khakasiya, Evenkijskij avtonomnyj okrug. Zone Asia/Krasnoyarsk 6:11:20 - LMT 1920 Jan 6 6:00 - KRAT 1930 Jun 21 # Krasnoyarsk Time 7:00 Russia KRA%sT 1991 Mar 31 2:00s 6:00 Russia KRA%sT 1992 Jan 19 2:00s 7:00 Russia KRA%sT In fact, it seems that Tomsk city and Tomskaya oblast' is part of the Novosibirsk timezone, see http://en.wikipedia.org/wiki/Tomskaya_Oblast%27%2C_Russia and http://www.admin.tomsk.ru/1024 ... the latter, if you don't understand russian, look at the time under the green horse. I don't know if this simply means that Tomskaya oblast' changed timezone since 2001, which is a possibility, that would then require a new timezone. Regards, - Jesper Jesper Nørgaard Welen Email: jnorgard(a)Prodigy.Net.mx Project Leader (Líder de Proyecto) Software 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 (55) 58-04-20-04 ext. 1374 Fax: +52 (55) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the shareware program World Time Explorer, I made: http://www.worldtimeexplorer.com/index.html

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Chinese timezones 1970
by Jesper Norgaard Welen 14 Sep '08

14 Sep '08

I have investigated the timezones around 1970 on the http://www.astro.com/atlas site, and here are the results. I am attaching a GIF file of the map I have built based on this information. The red borders are the modern-time administrative borders, while the green lines are the timezone borders I have determined, note that some of them are partially hidden behind the red lines. There are no big surprises. Most timezones follow modern-day administrative boundaries, with the exceptions being Xinjiang, Xizang (Tibet), Qinghai, Gansu, Nei Mongol (Inner Mongolia) and Guangdong. There was an exception in Heliongjiang region on GMT+8.5 where the northern-most county Mohe is on GMT+8. A few other exceptions were two counties on the Sichuan side of the Xizang - Sichuan border, counties Dege and Baiyu which lies on the Sichuan side and are therefore supposed to be GMT+7, Xizang region being GMT+6, but Dege county is GMT+8 according to astro.com while Baiyu county is GMT+6 (could be true), for the moment I am assuming that those two counties are mistakes in the astro.com data. The biggest surprise was that region Guangdong were dived in 3 timezones, a south/west part on GMT+6 (counties Xuwen, Haikang, Suixi, Lianjiang, Zhanjiang, Wuchuan, Huazhou, Gaozhou, Maoming, Dianbai, Xinyi) a central part on GMT+7 (counties Yangchun, Yangjiang, Taishan, Kaiping, Xinxing, Luoding, Yu'nan, Yunfu, Taishan, Deqing and Enping) and a north/east part on GMT+8 with the rest of the counties. Zone Asia/Harbin on GMT+8.5: regions Heilongjiang (minus Mohe) and Jilin. Zone Asia/Shanghai on GMT+8: regions east Nei Mongol, Liaoning, Hebei + Beijing, Shanxi, Shandong, Henan, Jiangsu, Anhui, Shanghai, Zhejiang, Hubei, Hunan, Jiangxi, Fujian, north/east Guangdong and Mohe county of Heilongjiang. Zone Asia/Chongqing on GMT+7: regions west Nei Mongol, Ningxia, Shaanxi, east Gansu, west Qinghai, Sichuan, Guizhou, Guangxi, Yunnan, Hainan island and the central part of Guangdong province. Zone Asia/Urumqi on GMT+6: regions east Xinjiang, west Gansu (counties Dunhuang, Aksay, Anxi, Subei), west Qinghai, east Xizang (Tibet) and east Guangdong. Zone Asia/Kashgar on GMT+5: regions west Xinjiang, west Xizang. Regards, - Jesper Jesper Nørgaard Welen Email: jnorgard(a)Prodigy.Net.mx Project Leader (Líder de Proyecto) Software 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 (55) 58-04-20-04 ext. 1374 Fax: +52 (55) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the shareware program World Time Explorer, I made: http://www.worldtimeexplorer.com/index.html

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please update ICU homepage URL on http://www.twinsun.com/tz/tz-link.htm
by Markus Scherer 27 Aug '07

27 Aug '07

Dear TZ DB maintainers, Please update the ICU homepage URL on http://www.twinsun.com/tz/tz-link.htm from http://www-306.ibm.com/software/globalization/icu/ to http://icu-project.org/ Thanks and best regards, markus

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FW: More daylight savings in Australia
by Olson, Arthur David (NIH/NCI) [E] 01 Aug '07

01 Aug '07

I'm forwarding this message from Susan Johnson, who is on the time zone mailing list at a different address than the one shown below. --ado -----Original Message----- From: Johnson, Susan [mailto:Susan.Johnson@kronos.com] Sent: Monday, July 23, 2007 8:39 To: tz(a)lecserver.nci.nih.gov Subject: RE: More daylight savings in Australia Folks, Do we have any official word on what will happen in Western/Southern Australia and when? My Australian office tells me that it now looks like South Australia, NSW, ACT, Victoria, and Tasmania DST changes will occur the first Sunday in April 2008 - instead of the first Sunday in October 2007. All changes are permanent except for South Australia, which will undergo a 'trial' change. --Sue Susan Johnson Manager, Customer Engineering Product Management Kronos Incorporated p: (978) 947-4342 f: (978) 367-5818 www.kronos.com Experts at Improving the Performance of People and Business(tm) -----Original Message----- From: Paul Eggert [mailto:eggert@CS.UCLA.EDU] Sent: Friday, April 13, 2007 4:12 AM To: tz(a)lecserver.nci.nih.gov Subject: Re: More daylight savings in Australia "Eric Ulevik" <eulevik(a)gmail.com> writes: > http://www.news.com.au/story/0,23599,21549128-2,00.html Thanks for the heads-up. Today's Sydney Morning Herald reports that South Australia and the Northern Territory (!) may sign up later, but that Western Australia and Queensland will not be involved. Perhaps we should wait a bit to see who falls into line. Also, the SMH says only "it is believed" the dates are as you mentioned. http://www.smh.com.au/articles/2007/04/12/1175971265494.html This is currently listed as the #4 most-viewed article on the Sydney Morning Herald web site. A slow news day? -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 269.3.0/758 - Release Date: 4/12/2007 11:52 AM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.12/910 - Release Date: 7/21/2007 3:52 PM

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FW: How to support such capabilites based on current Olson Time Zone implementation
by Olson, Arthur David (NIH/NCI) [E] 30 Jul '07

30 Jul '07

I'm forwarding this message from Martin Doug, who is not on the time zone mailing list. Those of you who are on the time zone mailing list should direct replies appropriately. --ado From: Martin Dong [mailto:cppcraze@gmail.com] Sent: Monday, July 30, 2007 5:22 To: markus.icu(a)gmail.com; yoshito_umaoka(a)us.ibm.com Cc: tz(a)lecserver.nci.nih.gov Subject: Re: FW: How to support such capabilites based on current Olson Time Zone implementation Dear Markus and Yoshito, Thanks for leading me to ICU project, which is really a full-featured library for internationalization. I feel it's more appropriate to consider using it from the very initial system design. However our system has already had its own internationalization mechanism, now we only want to utilize Olson Time Zone database. We need a light-weight solution but I think ICU is too heavy for us. Actually tzcode is a light-weight implementation, if I can make some change based on it to support what I want, I think it's enough. Dear Olson, I want to know more about tzfile in binary form. Is there any other detailed description? I feel it's a little bit hard to get it understood just through the tzcode (because the comments are vrey few:-). Btw, for now can any new functionality be added into tzcode implementation? Or another question, if my change can meet my requirements and it goes into our system, does it need to go into Olson tzcode? Sincerely, -Martin On 7/28/07, yoshito_umaoka(a)us.ibm.com <yoshito_umaoka(a)us.ibm.com > wrote: For the second requirement "getting the next nearest DST transition time", next version of ICU (ICU 3.8) will provide the API. -Yoshito "Markus Scherer" <markus.icu(a)gmail.com> wrote on 07/27/2007 02:38:00 PM: > Dear Martin, > > For at least the first requirement, you might want to try other time > zone support libraries listed on this list's homepage [1], for example > ICU [2]. You could also send an email to the icu-support mailing list > [3] to see if your second can be provided for. > > [1] http://www.twinsun.com/tz/tz-link.htm > [2] http://icu-project.org/ > [3] http://icu-project.org/contacts.html > > Best regards, > markus

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FW: How to support such capabilites based on current Olson Time Zone implementation
by Olson, Arthur David (NIH/NCI) [E] 30 Jul '07

30 Jul '07

I'm forwarding this message from Martin Dong, who is not on the time zone mailing list. Those of you who are on the time zone mailing list should direct replies appropriately. --ado From: Martin Dong [mailto:cppcraze@gmail.com] Sent: Friday, July 27, 2007 12:56 AM To: tz(a)lecserver.nci.nih.gov Subject: How to support such capabilites based on current Olson Time Zone implementation Dear All in this maillist, We have been investigating the feasibility of migrating Olson Time Zone Database to our system. Given that our system is Linux-based, we can just use tzcode implementation or Glibc functions because Glibc has adopted Olson implementation to some extent. But according to our basic and existing requirements, I have met some problems that I think are hard for me: * How to get the local time of different region or city at the same time? The basic requirement is to display the local time of different region or city at the same time. After some study of Olson implementation, I knew function "localtime" will handle everything, parsing tzfile and doing the conversion from utc to local time. The correct local time can be gotten through a simple invocation to "localtime". But "localtime" assumes the Sytem Local Time Zone is set in environmental variable "TZ" or from the Standard TimeZone file "/etc/localtime" if "TZ" is not defined in the process. In this case, how can a caller get the local time of some city which is not the System Local Time Zone? It seems we must change "TZ" or the Standard TimeZone file before calling "localtime" to get another city's local time because "localtime" doesn't take such an argument that can let caller specify a time zone, which means "localtime" can return the local time related to either the System Local Time Zone or the time zone user specifies. Although I know there're so many applications which already integrates the Olson Database and they have realized my above requirement "display multiple local time at the same time", I don't know how they make it. * How to get the notification of DST status change as time elaspes? This problem is out of our another requirement that we need to inform other components in our system of the DST status change in various conditions, such as changing time may lead to DST change, changing local time zone may lead to DST change, and as time elapsing, etc. The former two behaviors are user-active ones, we can track the change easily, but the problem is the last one, it's the system automatic behavior, our of the control of user. In this case, the system needs some CALLBACK ability to capture this change and further broadcast it. For our system, there's an Alarm Server that can provide timer machinasm. We will parse our own time zone database and get the next nearest DST transition time and add it to Alarm Server, then when the timer is time out, Alarm Server will trigger a CALLBACK function to further process. But it seems Olson is lack of such capability. After thinking from another perpsective, if we can get the next nearest DST transition time through Olson Time Zone database, we can still utilize our current Alarm Server. But it's still a problem how to get the next nearest DST transition time through the current Olson implementation because all the implementation is hiden behind "localtime". In all the public functions, there's no such one which can support getting the DST transition time. I don't have any good idea in mind right now. Should I make some modification to Olson to add such capability, or other way i could go? I will very much appreciate if any of you can give me some hints about above problems. Thank you in advance. Best Regards, -Martin

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FW: Does zic currently compile time zone abbreviations correctly?
by Olson, Arthur David (NIH/NCI) [E] 27 Jul '07

27 Jul '07

I'm forwarding this message from John Morrow, who is not on the time zone mailing list. Those of you who are on the time zone mailing list should direct replies appropriately. --ado -----Original Message----- From: John B. Morrow [mailto:jmorrow@sendwordnow.com] Sent: Friday, July 27, 2007 12:19 PM To: Olson, Arthur David (NIH/NCI) [E]; tz(a)lecserver.nci.nih.gov Subject: RE: Does zic currently compile time zone abbreviations correctly? This response and program was very helpful. Apparently I was missing the level of indirection that converted the type in the ttinfo into an abbrind to look up the abbreviation. For some time zones, that was fine and for others it wasn't. Now that I've added that additional level in, my program seems to be working correctly. Thank you for your quick response. John Morrow -----Original Message----- From: Olson, Arthur David (NIH/NCI) [E] [mailto:olsona@dc37a.nci.nih.gov] Sent: Friday, July 27, 2007 11:29 AM To: tz(a)elsie.nci.nih.gov Cc: John B. Morrow Subject: RE: Does zic currently compile time zone abbreviations correctly? The typescript below seems to indicate that there's nothing amiss with Europe/London; do you get different results if you run "tzhead"? --ado Script started on Fri 27 Jul 2007 11:24:37 AM EDT lecserver$ cat tzhead.c #include "private.h" struct tzhead { char tzh_magic[4]; /* TZ_MAGIC */ char tzh_version[1]; /* '\0' or '2' as of 2005 */ char tzh_reserved[15]; /* reserved--must be zero */ char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ char tzh_leapcnt[4]; /* coded number of leap seconds */ char tzh_timecnt[4]; /* coded number of transition times */ char tzh_typecnt[4]; /* coded number of local time types */ char tzh_charcnt[4]; /* coded number of abbr. chars */ }; static char * progname; static long long detzcode64(codep) const char * const codep; { register long long result; register int i; result = (codep[0] & 0x80) ? ~0L : 0L; for (i = 0; i < 8; ++i) result = result * 256 + (codep[i] & 0xff); return result; } static long long detzcode(codep) const char * const codep; { register long result; register int i; result = (codep[0] & 0x80) ? ~0L : 0L; for (i = 0; i < 4; ++i) result = (result << 8) | (codep[i] & 0xff); return result; } static void wild2exit(cp, dp) { (void) fprintf(stderr, "%s: wild result %s %s\n", progname, cp, dp); exit(1); } static void handle(filename) char * filename; { FILE * fp; struct tzhead tzh; long long ll; char c; int i; int pass; long ttisgmtcnt; long ttisstdcnt; long leapcnt; long timecnt; long typecnt; long charcnt; char buf[8]; struct tm tm; fp = fopen(filename, "r"); if (fp == NULL) wild2exit("result opening", filename); for (pass = 1; pass <= 2; ++pass) { if (fread(&tzh, sizeof tzh, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\tversion\t", filename); c = tzh.tzh_version[0]; if (isascii(c) && isprint(c)) (void) putchar(c); else (void) printf("\\%o", c); (void) putchar('\n'); ttisgmtcnt = detzcode(tzh.tzh_ttisgmtcnt); ttisstdcnt = detzcode(tzh.tzh_ttisstdcnt); leapcnt = detzcode(tzh.tzh_leapcnt); timecnt = detzcode(tzh.tzh_timecnt); typecnt = detzcode(tzh.tzh_typecnt); charcnt = detzcode(tzh.tzh_charcnt); (void) printf("%s\tttisgmtcnt\t%ld\n", filename, ttisgmtcnt); (void) printf("%s\tttisstdcnt\t%ld\n", filename, ttisstdcnt); (void) printf("%s\tleapcnt\t%ld\n", filename, leapcnt); (void) printf("%s\ttimecnt\t%ld\n", filename, timecnt); (void) printf("%s\ttypecnt\t%ld\n", filename, typecnt); (void) printf("%s\tcharcnt\t%ld\n", filename, charcnt); for (i = 0; i < timecnt; ++i) { if (fread(buf, pass * 4, 1, fp) != 1) wild2exit("result reading", filename); ll = (pass == 1) ? detzcode(buf) : detzcode64(buf); { time_t l; l = ll; tm = *gmtime(&l); } (void) printf("%s\ttime[%d]\t%lld\t%s", filename, i, ll, asctime(&tm)); } for (i = 0; i < timecnt; ++i) { if (fread(buf, 1, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\ttype[%d]\t%d\n", filename, i, buf[0]); } for (i = 0; i < typecnt; ++i) { long l; if (fread(buf, 4, 1, fp) != 1) wild2exit("result reading", filename); l = detzcode(buf); (void) printf("%s\ttype[%d].offset\t%ld\n", filename, i, l); if (fread(buf, 1, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\ttype[%d].isdst\t%ld\n", filename, i, buf[0]); if (fread(buf, 1, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\ttype[%d].abbrind\t%ld\n", filename, i, buf[0]); } for (i = 0; i < charcnt; ++i) { if (fread(buf, 1, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\tabbr[%d]\t", filename, i); if (isascii(buf[0]) && isprint(buf[0])) (void) printf("%c", buf[0]); else if (buf[0] == '\0') (void) printf("\\0"); else (void) printf("\%03o", buf[0]); (void) printf("\n"); } for (i = 0; i < ttisstdcnt; ++i) { if (fread(buf, 1, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\tisstd[%d]\t%d\n", filename, i, buf[0]); } for (i = 0; i < ttisgmtcnt; ++i) { if (fread(buf, 1, 1, fp) != 1) wild2exit("result reading", filename); (void) printf("%s\tisgmt[%d]\t%d\n", filename, i, buf[0]); } if (tzh.tzh_version[0] != '2') break; } if (fclose(fp) != 0) { (void) fprintf(stderr, "%s: wild result closing %s\n", progname, filename); exit(1); } } int main(argc, argv) int argc; char * argv[]; { int i; progname = argv[0]; for (i = 1; i < argc; ++i) handle(argv[i]); exit(0); } lecserver$ make tzhead cc -DTZDIR=\"/usr/local/etc/zoneinfo\" tzhead.c -o tzhead lecserver$ tzhead tmp/etc/zoneinfo/Europe/London | grep abbr tmp/etc/zoneinfo/Europe/London type[0].abbrind 0 tmp/etc/zoneinfo/Europe/London type[1].abbrind 4 tmp/etc/zoneinfo/Europe/London type[2].abbrind 8 tmp/etc/zoneinfo/Europe/London type[3].abbrind 0 tmp/etc/zoneinfo/Europe/London type[4].abbrind 0 tmp/etc/zoneinfo/Europe/London type[5].abbrind 4 tmp/etc/zoneinfo/Europe/London type[6].abbrind 4 tmp/etc/zoneinfo/Europe/London abbr[0] B tmp/etc/zoneinfo/Europe/London abbr[1] S tmp/etc/zoneinfo/Europe/London abbr[2] T tmp/etc/zoneinfo/Europe/London abbr[3] \0 tmp/etc/zoneinfo/Europe/London abbr[4] G tmp/etc/zoneinfo/Europe/London abbr[5] M tmp/etc/zoneinfo/Europe/London abbr[6] T tmp/etc/zoneinfo/Europe/London abbr[7] \0 tmp/etc/zoneinfo/Europe/London abbr[8] B tmp/etc/zoneinfo/Europe/London abbr[9] D tmp/etc/zoneinfo/Europe/London abbr[10] S tmp/etc/zoneinfo/Europe/London abbr[11] T tmp/etc/zoneinfo/Europe/London abbr[12] \0 tmp/etc/zoneinfo/Europe/London type[0].abbrind 0 tmp/etc/zoneinfo/Europe/London type[1].abbrind 4 tmp/etc/zoneinfo/Europe/London type[2].abbrind 8 tmp/etc/zoneinfo/Europe/London type[3].abbrind 12 tmp/etc/zoneinfo/Europe/London type[4].abbrind 4 tmp/etc/zoneinfo/Europe/London type[5].abbrind 4 tmp/etc/zoneinfo/Europe/London type[6].abbrind 8 tmp/etc/zoneinfo/Europe/London type[7].abbrind 8 tmp/etc/zoneinfo/Europe/London abbr[0] L tmp/etc/zoneinfo/Europe/London abbr[1] M tmp/etc/zoneinfo/Europe/London abbr[2] T tmp/etc/zoneinfo/Europe/London abbr[3] \0 tmp/etc/zoneinfo/Europe/London abbr[4] B tmp/etc/zoneinfo/Europe/London abbr[5] S tmp/etc/zoneinfo/Europe/London abbr[6] T tmp/etc/zoneinfo/Europe/London abbr[7] \0 tmp/etc/zoneinfo/Europe/London abbr[8] G tmp/etc/zoneinfo/Europe/London abbr[9] M tmp/etc/zoneinfo/Europe/London abbr[10] T tmp/etc/zoneinfo/Europe/London abbr[11] \0 tmp/etc/zoneinfo/Europe/London abbr[12] B tmp/etc/zoneinfo/Europe/London abbr[13] D tmp/etc/zoneinfo/Europe/London abbr[14] S tmp/etc/zoneinfo/Europe/London abbr[15] T tmp/etc/zoneinfo/Europe/London abbr[16] \0 lecserver$ exit script done on Fri 27 Jul 2007 11:25:04 AM EDT From: John B. Morrow [mailto:jmorrow@sendwordnow.com] Sent: Friday, July 27, 2007 2:29 AM To: tz(a)lecserver.nci.nih.gov Subject: Does zic currently compile time zone abbreviations correctly? In the process of extracting time zone information from the zoneinfo database, I noticed that the abbreviation pointer break for quite a few time zones including Europe/London, Asia/Dubai, and quite a few others. The problem seems to be in the compiled time zone files so I spent some time looking at zic. What seems to be happening is that zic uses some criteria to determine of the abbreviation (and other info for types) is used and won't write it if it thinks it isn't needed. The problem is that it doesn't adjust the indexes (tt_abbrind) that reference those abbreviations, so they'll point to bad data or empty strings. My quick (and admittedly heavy handed fix) was to force zic to write all of the abbreviations, whether they are necessary or not. If this really is a problem, it should probably be fixed at some point. Please note that the data in our fairly recently updated Linux server has abbreviations that don't seem to work. If I'm missing something or there is some other way more correct way to reference the abbreviations, please let me know. I'm using tt_abbrind as per the tzfile man page and the tzcode2007f.tar.gz sources. John Morrow

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FW: Does zic currently compile time zone abbreviations correctly?
by Olson, Arthur David (NIH/NCI) [E] 27 Jul '07

27 Jul '07

I'm forwarding this message from John B. Morrow, who is not on the time zone mailing list. Those of you who are on the time zone mailing list should direct replies appropriately. --ado From: John B. Morrow [mailto:jmorrow@sendwordnow.com] Sent: Friday, July 27, 2007 2:29 AM To: tz(a)lecserver.nci.nih.gov Subject: Does zic currently compile time zone abbreviations correctly? In the process of extracting time zone information from the zoneinfo database, I noticed that the abbreviation pointer break for quite a few time zones including Europe/London, Asia/Dubai, and quite a few others. The problem seems to be in the compiled time zone files so I spent some time looking at zic. What seems to be happening is that zic uses some criteria to determine of the abbreviation (and other info for types) is used and won't write it if it thinks it isn't needed. The problem is that it doesn't adjust the indexes (tt_abbrind) that reference those abbreviations, so they'll point to bad data or empty strings. My quick (and admittedly heavy handed fix) was to force zic to write all of the abbreviations, whether they are necessary or not. If this really is a problem, it should probably be fixed at some point. Please note that the data in our fairly recently updated Linux server has abbreviations that don't seem to work. If I'm missing something or there is some other way more correct way to reference the abbreviations, please let me know. I'm using tt_abbrind as per the tzfile man page and the tzcode2007f.tar.gz sources. John Morrow

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Does zic currently compile time zone abbreviations correctly?
by John B. Morrow 26 Jul '07

26 Jul '07

In the process of extracting time zone information from the zoneinfo database, I noticed that the abbreviation pointer break for quite a few time zones including Europe/London, Asia/Dubai, and quite a few others. The problem seems to be in the compiled time zone files so I spent some time looking at zic. What seems to be happening is that zic uses some criteria to determine of the abbreviation (and other info for types) is used and won't write it if it thinks it isn't needed. The problem is that it doesn't adjust the indexes (tt_abbrind) that reference those abbreviations, so they'll point to bad data or empty strings. My quick (and admittedly heavy handed fix) was to force zic to write all of the abbreviations, whether they are necessary or not. If this really is a problem, it should probably be fixed at some point. Please note that the data in our fairly recently updated Linux server has abbreviations that don't seem to work. If I'm missing something or there is some other way more correct way to reference the abbreviations, please let me know. I'm using tt_abbrind as per the tzfile man page and the tzcode2007f.tar.gz sources. John Morrow

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