- tz - lists.iana.org

time zone library
by John Dlugosz Jan. 7, 2009

Jan. 7, 2009

I downloaded the timezone library, and in adapting it to my needs I've been figuring out how it works. I have a few questions, and also (hopefully) a contribution. First, my contribution. Regarding /* ** Adapted from code provided by Robert Elz, who writes: ** The "best" way to do mktime I think is based on an idea of Bob ** Kridle's (so its said...) from a long time ago. ** It does a binary search of the time_t space. Since time_t's are ** just 32 bits, its a max of 32 iterations (even at 64 bits it ** would still be very reasonable). */ I'm using 64-bit time_t values, and find that it usually takes 62 to 64 iterations. Basically, it is always worst case. I tried using a rough guess for the initial hi and low: lo = ((yourtm.tm_year-70) * 365i64 + yourtm.tm_mon * 28) * SecondsPerDay; hi = ((yourtm.tm_year-70) * 366i64 + (yourtm.tm_mon+1)*31) * SecondsPerDay; when the resulting time_t would be positive, and it completes in 20 to 23 iterations. I punted on the negative case, but a very similar calculation would work. When tm_year < 70, I just used the smallest value I care about for lo, and 0 for hi. That gives me worst case 35 iterations, because I'm only supporting values back to 1752 CE, not the full range of a 64-bit number, which would be 21 times longer than the age of the universe. Now for my first question. TZ_MAX_TIMES is 1200, and that is exactly the length of the arrays for state::ats and state::types. I suppose it is noting every time change, e.g. DST adjustments twice a year for 600 years? There is no need to store anything before the first reported time in the configuration files, as it simply uses the first entry for anything older (no DST in pre-history); it seems to have code for dealing with dates beyond the end of the table. Does it extrapolate the current DST rule in the future? I'd like to cut off the table at a more reasonable date for my application. Where is that table populated? Is it when the data file is loaded, or in zic when it is created? My second question concerns leap seconds. It appears that the leap second data is associated with every zone file. Why isn't it simply the same for everything, and global? --John

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FW: Oops - forgot to make sure the URL was clear
by Olson, Arthur David (NIH/NCI) [E] Jan. 5, 2009

Jan. 5, 2009

I'm forwarding this message from Dave Thewlis, who is not on the time zone mailing list (at least not at the address below). Those of you who are on the list, please direct replies appropriately. --ado From: Dave Thewlis [mailto:Dave.Thewlis@calconnect.org] Sent: Monday, January 05, 2009 5:33 To: Olson, Arthur David (NIH/NCI) [E] Subject: Oops - forgot to make sure the URL was clear Dear Arthur David, Thanks you very much for posting the invitation. However the URL about the workshop didn't come through clearly, so if you would, could you please add the following post to the TZ list: URL for the CalConnect Timezone Workshop Please see http://www.calconnect.org/timezoneworkshop.shtml for more information and to register. Thanks! Dave Thewlis -- Dave Thewlis, Executive Director Calconnect - The Calendaring and Scheduling Consortium +1 707 840 9391 (voice) · +1 707 498 2238 (mobile) http://www.calconnect.org · Dave.Thewlis(a)calconnect.org

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Patch to support --help
by Joseph S. Myers Jan. 2, 2009

Jan. 2, 2009

The tools zdump and zic support the GNU-standard --version option (output version information to stdout and exit successfully), but not the associated --help option (output usage and bug reporting information to stdout and exit successfully). This patch adds such support. tzselect supports neither option, so this patch adds support for both options to it. diff -ru tzcode.orig/tzselect.ksh tzcode/tzselect.ksh --- tzcode.orig/tzselect.ksh 2008-09-10 02:33:17.000000000 +0000 +++ tzcode/tzselect.ksh 2009-01-02 16:55:45.000000000 +0000 @@ -1,6 +1,6 @@ #! /bin/ksh -# '@(#)tzselect.ksh 8.1' +VERSION='@(#)tzselect.ksh 8.1' # Ask the user about the time zone, and output the resulting TZ value to stdout. # Interact with the user via stderr and stdin. @@ -45,6 +45,21 @@ exit 1 } +if [ "$1" = "--help" ]; then + cat <<EOF +Usage: tzselect +Select a time zone interactively. + +Report bugs to tz(a)elsie.nci.nih.gov. +EOF + exit 0 +elif [ "$1" = "--version" ]; then + cat <<EOF +tzselect $VERSION +EOF + exit 0 +fi + # Make sure the tables are readable. TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab TZ_ZONE_TABLE=$TZDIR/zone.tab diff -ru tzcode.orig/zdump.c tzcode/zdump.c --- tzcode.orig/zdump.c 2008-09-10 02:33:24.000000000 +0000 +++ tzcode/zdump.c 2009-01-02 16:56:59.000000000 +0000 @@ -230,6 +230,17 @@ warned = TRUE; } +static void +usage(const char *progname, FILE *stream, int status) +{ + (void) fprintf(stream, +_("%s: usage is %s [ --version ] [ --help ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n\ +\n\ +Report bugs to tz(a)elsie.nci.nih.gov.\n"), + progname, progname); + exit(status); +} + int main(argc, argv) int argc; @@ -266,6 +277,8 @@ if (strcmp(argv[i], "--version") == 0) { (void) printf("%s\n", elsieid); exit(EXIT_SUCCESS); + } else if (strcmp(argv[i], "--help") == 0) { + usage(progname, stdout, EXIT_SUCCESS); } vflag = 0; cutarg = NULL; @@ -275,10 +288,7 @@ else cutarg = optarg; if ((c != EOF && c != -1) || (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) { - (void) fprintf(stderr, -_("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"), - progname, progname); - exit(EXIT_FAILURE); + usage(progname, stderr, EXIT_FAILURE); } if (vflag) { if (cutarg != NULL) { diff -ru tzcode.orig/zic.c tzcode/zic.c --- tzcode.orig/zic.c 2008-09-10 02:33:18.000000000 +0000 +++ tzcode/zic.c 2009-01-02 16:57:40.000000000 +0000 @@ -156,7 +156,7 @@ const struct zone * zp, int ntzones); static void setboundaries(void); static zic_t tadd(zic_t t1, long t2); -static void usage(void); +static void usage(FILE *stream, int status); static void writezone(const char * name, const char * string); static int yearistype(int year, const char * type); @@ -454,13 +454,15 @@ } static void -usage(void) +usage(FILE *stream, int status) { - (void) fprintf(stderr, _("%s: usage is %s \ -[ --version ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\ -\t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n"), - progname, progname); - exit(EXIT_FAILURE); + (void) fprintf(stream, _("%s: usage is %s \ +[ --version ] [ --help ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\ +\t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n\ +\n\ +Report bugs to tz(a)elsie.nci.nih.gov.\n"), + progname, progname); + exit(status); } static const char * psxrules; @@ -498,11 +500,13 @@ if (strcmp(argv[i], "--version") == 0) { (void) printf("%s\n", elsieid); exit(EXIT_SUCCESS); + } else if (strcmp(argv[i], "--help") == 0) { + usage(stdout, EXIT_SUCCESS); } while ((c = getopt(argc, argv, "d:l:p:L:vsy:")) != EOF && c != -1) switch (c) { default: - usage(); + usage(stderr, EXIT_FAILURE); case 'd': if (directory == NULL) directory = optarg; @@ -561,7 +565,7 @@ break; } if (optind == argc - 1 && strcmp(argv[optind], "=") == 0) - usage(); /* usage message by request */ + usage(stderr, EXIT_FAILURE); /* usage message by request */ if (directory == NULL) directory = TZDIR; if (yitcommand == NULL) -- Joseph S. Myers jsm(a)polyomino.org.uk

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Australian timezone on Linux
by Girish Hilage Jan. 1, 2009

Jan. 1, 2009

Hi, I have a problem setting the Australian DST timezone on my Fedora Core 8 system. When DST starts it is able to advance the time by an hour but the time does not wind back by an hour while DST ends. I am using timezone "South Australia". DST start : [girish@mymachine Australia]$ date Sun Oct 5 01:59:57 CST 2008 [girish@mymachine Australia]$ date Sun Oct 5 01:59:58 CST 2008 [girish@mymachine Australia]$ date Sun Oct 5 03:00:00 CST 2008 [girish@mymachine Australia]$ date Sun Oct 5 03:00:03 CST 2008 DST end : [girish@mymachine Australia]$ date Sun Apr 5 02:59:57 CST 2009 [girish@mymachine Australia]$ date Sun Apr 5 02:59:59 CST 2009 [girish@mymachine Australia]$ date Sun Apr 5 03:00:01 CST 2009 [girish@mymachine Australia]$ date Sun Apr 5 03:00:02 CST 2009 This is also not working for Apr 6 08. Is there any reason why is it not working properly? Regards, Girish DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.

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FW: New Location request
by Olson, Arthur David (NIH/NCI) [E] Dec. 30, 2008

Dec. 30, 2008

I'm forwarding this message from Marek Hajduczenia, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. MH: there's already a GMT-12 binary in the distributed version of the package; it is named "Etc/GMT-12." But using the name "GMT-12" should do what you want on the largest number of computers. --ado -----Original Message----- From: Marek Hajduczenia [mailto:marek_haj@2com.pl] Sent: Tuesday, December 23, 2008 2:42 To: 'Paul Eggert'; tz(a)lecserver.nci.nih.gov Subject: RE: FW: New Location request Hi Paul, Thank You for the answer. GMT-12 hrs would resolve the problem since I need to track time and day. It is critical since the ballots close e.g. xx.xx.2009 at 11.59 AOE, so that way I can trace what day and what hour is in Howland Island time zone. If Howland Island is not a good location, please add simply GMT-12 and provide the name as AOE (Anywhere On Earth reference). Is that possible ? Regards Marek Hajduczenia -----Original Message----- From: Paul Eggert [mailto:eggert@CS.UCLA.EDU] Sent: segunda-feira, 22 de Dezembro de 2008 23:17 To: tz(a)elsie.nci.nih.gov Cc: marek_haj(a)2com.pl Subject: Re: FW: New Location request > From: Marek Hajduczenia [mailto:marek_haj@2com.pl] > Sent: Saturday, December 20, 2008 3:30 > I am writing to You with a small request. Is it possible to add one > location to time zone data base app i.e. Howland Island (see: > http://www.worldtimezone.com/time/wtzresult.php?CiID=42242) It is > used heavily in IEEE ballots as the Anywhere On Earth time locator and > it would be nice to have. Me and my colleagues use various plugins > which in turns use this data base for reference and currently this > location is not available. I do realize that this is not an inhabited > island though there is some point of merit in adding it to the > list. Alternatively, adding any location which has GMT-12 hrs would be > of use, no matter what the name is. It would be most useful for IEEE > community (I am speaking here as its member only). Would TZ='Etc/GMT+12' solve your problem? As far as we know, Howland was using Hawaii War Time (9.5 hours behind UTC) the last time that it was inhabited, so I'm afraid it's not a good representative for the zone that is 12 hours behind UTC.

2 1

question about Argentina 1946 - 1963
by Alois Treindl Dec. 29, 2008

Dec. 29, 2008

In the Argentina timezone rules I find a strange fact: continuous DST from Oct 1946 to Oct 1963. The rules are: Rule Arg 1946 only - Mar 1 0:00 0 - Rule Arg 1946 only - Oct 1 0:00 1:00 S Rule Arg 1963 only - Oct 1 0:00 0 - Rule Arg 1963 only - Dec 15 0:00 1:00 S There are no other rules affecting the years 1946 or 1963 or any year in between. This means that Argentina was continuously on DST. Is this really correct, and what are the sources for that?

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FW: New Location request
by Olson, Arthur David (NIH/NCI) [E] Dec. 23, 2008

Dec. 23, 2008

I'm forwarding this message from Marek Hajduczenia, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. --ado From: Marek Hajduczenia [mailto:marek_haj@2com.pl] Sent: Saturday, December 20, 2008 3:30 To: tz(a)lecserver.nci.nih.gov Subject: New Location request Dear Sir/Madam, I am writing to You with a small request. Is it possible to add one location to time zone data base app i.e. Howland Island (see: http://www.worldtimezone.com/time/wtzresult.php?CiID=42242) It is used heavily in IEEE ballots as the Anywhere On Earth time locator and it would be nice to have. Me and my colleagues use various plugins which in turns use this data base for reference and currently this location is not available. I do realize that this is not an inhabited island though there is some point of merit in adding it to the list. Alternatively, adding any location which has GMT-12 hrs would be of use, no matter what the name is. It would be most useful for IEEE community (I am speaking here as its member only). If You have any comments, please let me know. Kindest regards Marek Hajduczenia

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tzdata for Switzerland 1940 - 1942 probably incorrect - PS
by Alois Treindl Dec. 16, 2008

Dec. 16, 2008

I forgot to correct the begin times. These must be according to the meteorological federal office: The rules must be changed to Rule Swiss 1941 1942 - May Mon>=1 1:00 1:00 S Rule Swiss 1941 1942 - Oct Mon>=1 2:00 0 - or made explicit for these two years, 1941 and 1942. The rule for 1940 must be deleted. Best regards Alois Treindl -- || Dr. Alois Treindl, Astrodienst AG, mailto:alois@astro.com || Zollikon/Zurich, Switzerland || Free astrological charts at http://www.astro.com/ || SWISS EPHEMERIS Free Edition at http://www.astro.com/swisseph/

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tzdata for Switzerland 1940 - 1942 probably incorrect
by Alois Treindl Dec. 15, 2008

Dec. 15, 2008

Hello tzdata currently has these rules for Switzerland: # From Whitman (who writes ``Midnight?''): Rule Swiss 1940 only - Nov 2 0:00 1:00 S Rule Swiss 1940 only - Dec 31 0:00 0 - # From Shanks & Pottenger: Rule Swiss 1941 1942 - May Sun>=1 2:00 1:00 S Rule Swiss 1941 1942 - Oct Sun>=1 0:00 0 - These are most likely incorrect. I have been practicing astrology in Switzerland since 1980 (in recent years running the website www.astro.com) and have never come upon any source which claimed DST in Switzerland for 1940. A current source is for example metas.ch/metasweb/Themen/sommerzeit;internal which is the Federal office for meteorology. This page has (near the bottom) Sommerzeit 1941 bis 1942 Bei Beginn wurden die Uhren von 01:00 auf 02:00 Uhr vorgestellt und am Ende entsprechend von 02:00 auf 01:00 h zurückgestellt. (begin at 1 am, clocks shifted to 2am; end 2am, clocks shifted to 1 am) 1942 begin 4. Mai end 5. Oktober 1941 begin 5. Mai end 6. Oktober This is what Shanks has in the International Atlas, all editions. He is wrongly quoted in tzdata. 5 may 1941 is a monday, 6 Oct 1942 is a monday. 4 may 1942 and 5 Oct 1942 are also mondays. The rules must either be changed to Rule Swiss 1941 1942 - May Mon>=1 2:00 1:00 S Rule Swiss 1941 1942 - Oct Mon>=1 0:00 0 - or made explicit for these two years, 1941 and 1942. The rule for 1940 must be deleted. Best regards Alois Treindl -- || Dr. Alois Treindl, Astrodienst AG, mailto:alois@astro.com || Zollikon/Zurich, Switzerland || Free astrological charts at http://www.astro.com/ || SWISS EPHEMERIS Free Edition at http://www.astro.com/swisseph/

1 0

time during standard to DST transition
by Jennifer Wang (jennifwa) Dec. 12, 2008

Dec. 12, 2008

Hello, We ran into a problem when setting time to the "missing hour" during transition from standard time to DST time. For example, setting time to Mar 8, 2009 at 2:10am using America/Los_Angeles time zone results in error. Should mktime() skip forward in this case and set the time to Mar 8, 2009 3:10am? Jennifer

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Mahe India TZ off 1 hr 30 min
by Julie Delany Dec. 11, 2008

Dec. 11, 2008

Hi, I found that Mahe, India (Mahe is the only city in India in the TZ? It's all one timezone anyway) has an error in the tz database. Per the world clock's meeting time program (using the TZ?): http:// www.timeanddate.com/worldclock/meetingtime.html? month=12&day=17&year=2008&p1=44&p2=224&p3=179&p4=-1 If it is 10:00 am Los Angeles time Wednesday Dec 17th, 2008, it is 11:30 p.m. in Mahe/Mumbai/India. But when I'm using the TZ in my perl program I get 10:00 p.m. Could you check that out for me? I've had to update my perl script to add 1 hour & 30 min. Thanks, julie

1 1

FW: Wrong Argentinian DST introduced in version 2008f
by Olson, Arthur David (NIH/NCI) [E] Dec. 11, 2008

Dec. 11, 2008

I'm forwarding this message from Aurelien Jarno, who is not on the time zone mailing list. Those of you who are on the time zone mailing list, please direct replies appropriately. --ado -----Original Message----- From: Aurelien Jarno [mailto:aurelien@aurel32.net] Sent: Monday, October 06, 2008 9:29 To: tz(a)lecserver.nci.nih.gov Subject: Wrong Argentinian DST introduced in version 2008f Hi, tzdata version 2008f introduced a rule for Argentinian DST based on http://www.worldtimezone.com/dst_news/dst_news_argentina03.html and http://www.impulsobaires.com.ar/nota.php?id=57832 Unfortunately those links only speak about rumors of a DST change, there is nothing fixed officially, and according to some Argentinian people DST may even not happen this year. Until an official decision is taken it is probably a lot better to remove any DST rule for year 2008. Please find attached a patch to do that. Regards, Aurelien -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' aurel32(a)debian.org | aurelien(a)aurel32.net `- people.debian.org/~aurel32 | www.aurel32.net

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Fwd: zdump loop problem
by Jonathan Leffler Dec. 11, 2008

Dec. 11, 2008

Originally sent to the wrong email address - sorry. ---------- Forwarded message ---------- From: Jonathan Leffler <jonathan.leffler(a)gmail.com> Date: Mon, Dec 8, 2008 at 12:14 PM Subject: Re: zdump loop problem To: Robbin Kawabata <Robbin.Kawabata(a)sun.com> Cc: tz(a)lecserver.nci.nih.gov, a.radke(a)arcor.de On Mon, Dec 8, 2008 at 11:50 AM, Robbin Kawabata <Robbin.Kawabata(a)sun.com>wrote: > I ran ado's fix against all the timezones, and got good results. > > This is the diff: > > *** zdump_loop.c Tue Dec 2 11:17:01 2008 > --- zdump_fix_ado.c Tue Dec 2 12:49:05 2008 > *************** > *** 312,322 **** > (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1); > } > for (;;) { > ! if (t >= cuthitime) > break; > newt = t + SECSPERHOUR * 12; > - if (newt >= cuthitime) > - break; > if (newt <= t) > break; > newtmp = localtime(&newt); > --- 312,320 ---- > (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1); > } > for (;;) { > ! if (t >= cuthitime || t >= cuthitime - SECSPERHOUR > * 12) > break; > Isn't that code equivalent to just: if (t >= cuthitime - SECSPERHOUR * 12) I've not followed all the details of the thread, but AFAIUI, this code is protecting against overflow on positive quantities (rather than underflow on negative ones), and the double test is redundant unless cuthitime is within 12 * SECPERHOUR of the smallest (most negative) integer. > newt = t + SECSPERHOUR * 12; > if (newt <= t) > break; > newtmp = localtime(&newt); > > > However, isn't the check for "if (newt <= t) break" no longer needed? > Probably... > ----- Begin Forwarded Message ----- > > Date: Mon, 01 Dec 2008 16:21:00 -0500 > From: "Olson, Arthur David (NIH/NCI) [E]" <olsona(a)dc37a.nci.nih.gov> > Subject: Re: zdump loop problem > To: tz(a)lecserver.nci.nih.gov > Cc: Andreas Radke <a.radke(a)arcor.de> > > So...in the real world, does changing the zic.c lines reading... > if (t >= cuthitime) > break; > newt = t + SECSPERHOUR * 12; > if (newt >= cuthitime) > break; > ...to read... > if (t >= cuthitime || t >= cuthitime - > SECSPERHOUR * 12) > break; > newt = t + SECSPERHOUR * 12; > ...result in working code? I'd particularly appreciate feedback from > Andreas Radke or other ArchLinux users. > > ----- End Forwarded Message ----- > -- Jonathan Leffler <jonathan.leffler(a)gmail.com> #include <disclaimer.h> Guardian of DBD::Informix - v2008.0513 - http://dbi.perl.org "Blessed are we who can laugh at ourselves, for we shall never cease to be amused."

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FW: Cuba 2004-2006
by Olson, Arthur David (NIH/NCI) [E] Dec. 10, 2008

Dec. 10, 2008

I'm forwarding this message from hsv(a)tbbs.net, who is not on the time zone mailing list (at least not at that address). Those of you who are on the list, please direct replies appropriately. Hsv is correct that there's no real shift in April 2005 or April 2006. While the current rules do the right thing, I plan to include a change from... Rule Cuba 2000 2006 - Apr Sun>=1 0:00s 1:00 D ...to... Rule Cuba 2000 2004 - Apr Sun>=1 0:00s 1:00 D ...in the next bundle of changes for clarity. --ado -----Original Message----- From: hsv(a)tbbs.net [mailto:hsv@tbbs.net] Sent: Sunday, December 07, 2008 12:19 To: tz(a)lecserver.nci.nih.gov Subject: Cuba 2004-2006 This looks queer: Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S Rule Cuba 2000 2006 - Apr Sun>=1 0:00s 1:00 D Rule Cuba 2006 max - Oct lastSun 0:00s 0 S I take the foregoing for something like this: ... 2003 Apr Sun>=1 0:00s 1:00 D 2003 Oct lastSun 0:00s 0 S 2004 Apr Sun>=1 0:00s 1:00 D 2005 Apr Sun>=1 0:00s 1:00 D 2006 Apr Sun>=1 0:00s 1:00 D 2006 Oct lastSun 0:00s 0 S ... but at those Aprils in 2005 and 2006 there is no real shift. Is this right?

1 0

Brazil rule issue
by Alain Petit Dec. 10, 2008

Dec. 10, 2008

Hi I am looking in the Brazil rules and I was wondering if this was expected: <snapshot> Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S # From Frederico A. C. Neves (2008-09-10): # Acording to this decree # <a href="http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm"> # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm # </a> # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the # 3rd Feb Sunday. There is an exception on the return date when this is # the Carnival Sunday then the return date will be the next Sunday... Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 - Rule Brazil 2023 only - Feb Sun>=22 0:00 0 - Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 - Rule Brazil 2026 only - Feb Sun>=22 0:00 0 - Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 - Rule Brazil 2034 only - Feb Sun>=22 0:00 0 - Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 - Rule Brazil 2037 only - Feb Sun>=22 0:00 0 - # From Arthur David Olson (2008-09-29): # The next is wrong in some years but is better than nothing. Rule Brazil 2038 max - Feb Sun>=15 0:00 0 - </snapshot> There is 2 'max' entry for Brazil, one for 2008, and one for 2038. Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S Rule Brazil 2038 max - Feb Sun>=15 0:00 0 - Reading the entries for 2012+ I feel that the one for 2008 should be a 'only' rather than 'max'. Is that correct? Thanks Alain Petit

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Re: Timezones and Holidays
by Sue Williams Dec. 9, 2008

Dec. 9, 2008

> > Hello All, > > Anyone have information on a location that would describe local/official > holidays in some sort of global format like the timezones? > > Bill Raymond > braymond <at> arinc.com Q++ Studio is another website offering comprehensive worldwide public holiday information. http://www.qppstudio.net/publicholidays.htm Here's another organization that focusses on Bank holidays: http://www.bank-holidays.com/ With a little searching, there may be more. I'm not aware of any open community effort to maintain such information. Perhaps someone else knows of something. Good luck. Susan J Williams

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FW: Nepal timezone spelling
by Olson, Arthur David (NIH/NCI) [E] Dec. 9, 2008

Dec. 9, 2008

I'm forwarding this message from Phil Vandry; PV is now on the time zone mailing list. --ado -----Original Message----- From: Phil Vandry [mailto:vandry@TZoNE.ORG] Sent: Thursday, December 04, 2008 4:10 To: tz(a)lecserver.nci.nih.gov Subject: Nepal timezone spelling Hello, I propose that the name of the Asia/Katmandu zone be changed to Asia/Kathmandu. Although Katmandu is an acceptable alternate spelling, I can attest, having recently returned from a holiday in Nepal, that it is hardly ever used. In fact, I saw no occurence at all of the spelling 'Katmandu' while inside the country. This patch keeps the Katmandu spelling for backward compatibility. After trying Asia/Kathmandu and then grepping the whole database for Kathmandu, I nearly concluded that this timezone definition was missing from the database before finally finding it under the alternate spelling! -Phil --- asia.orig 2008-10-08 08:35:57.000000000 -0400 +++ asia 2008-12-04 16:05:36.000000000 -0500 @@ -1474,7 +1474,7 @@ # Nepal # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Katmandu 5:41:16 - LMT 1920 +Zone Asia/Kathmandu 5:41:16 - LMT 1920 5:30 - IST 1986 5:45 - NPT # Nepal Time --- backward.orig 2008-09-09 22:33:26.000000000 -0400 +++ backward 2008-12-04 16:05:28.000000000 -0500 @@ -24,6 +24,7 @@ Link Asia/Ashgabat Asia/Ashkhabad Link Asia/Chongqing Asia/Chungking Link Asia/Dhaka Asia/Dacca +Link Asia/Kathmandu Asia/Katmandu Link Asia/Kolkata Asia/Calcutta Link Asia/Macau Asia/Macao Link Asia/Jerusalem Asia/Tel_Aviv

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Nepal timezone spelling
by Phil Vandry Dec. 9, 2008

Dec. 9, 2008

Hello, I propose that the name of the Asia/Katmandu zone be changed to Asia/Kathmandu. Although Katmandu is an acceptable alternate spelling, I can attest, having recently returned from a holiday in Nepal, that it is hardly ever used. In fact, I saw no occurence at all of the spelling 'Katmandu' while inside the country. This patch keeps the Katmandu spelling for backward compatibility. After trying Asia/Kathmandu and then grepping the whole database for Kathmandu, I nearly concluded that this timezone definition was missing from the database before finally finding it under the alternate spelling! -Phil --- asia.orig 2008-10-08 08:35:57.000000000 -0400 +++ asia 2008-12-04 16:05:36.000000000 -0500 @@ -1474,7 +1474,7 @@ # Nepal # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Katmandu 5:41:16 - LMT 1920 +Zone Asia/Kathmandu 5:41:16 - LMT 1920 5:30 - IST 1986 5:45 - NPT # Nepal Time --- backward.orig 2008-09-09 22:33:26.000000000 -0400 +++ backward 2008-12-04 16:05:28.000000000 -0500 @@ -24,6 +24,7 @@ Link Asia/Ashgabat Asia/Ashkhabad Link Asia/Chongqing Asia/Chungking Link Asia/Dhaka Asia/Dacca +Link Asia/Kathmandu Asia/Katmandu Link Asia/Kolkata Asia/Calcutta Link Asia/Macau Asia/Macao Link Asia/Jerusalem Asia/Tel_Aviv

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Re: zdump loop problem
by Robbin Kawabata Dec. 8, 2008

Dec. 8, 2008

I ran ado's fix against all the timezones, and got good results. This is the diff: *** zdump_loop.c Tue Dec 2 11:17:01 2008 --- zdump_fix_ado.c Tue Dec 2 12:49:05 2008 *************** *** 312,322 **** (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1); } for (;;) { ! if (t >= cuthitime) break; newt = t + SECSPERHOUR * 12; - if (newt >= cuthitime) - break; if (newt <= t) break; newtmp = localtime(&newt); --- 312,320 ---- (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1); } for (;;) { ! if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12) break; newt = t + SECSPERHOUR * 12; if (newt <= t) break; newtmp = localtime(&newt); However, isn't the check for "if (newt <= t) break" no longer needed? ----- Begin Forwarded Message ----- Date: Mon, 01 Dec 2008 16:21:00 -0500 From: "Olson, Arthur David (NIH/NCI) [E]" <olsona(a)dc37a.nci.nih.gov> Subject: Re: zdump loop problem To: tz(a)lecserver.nci.nih.gov Cc: Andreas Radke <a.radke(a)arcor.de> So...in the real world, does changing the zic.c lines reading... if (t >= cuthitime) break; newt = t + SECSPERHOUR * 12; if (newt >= cuthitime) break; ...to read... if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12) break; newt = t + SECSPERHOUR * 12; ...result in working code? I'd particularly appreciate feedback from Andreas Radke or other ArchLinux users. ----- End Forwarded Message -----

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FW: Time Zone naming
by Olson, Arthur David (NIH/NCI) [E] Dec. 8, 2008

Dec. 8, 2008

I'm forwarding this message from Martin Barnes, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. --ado From: Martin Barnes [mailto:barnes@yahoo-inc.com] Sent: Friday, November 28, 2008 11:48 To: tz(a)lecserver.nci.nih.gov Subject: Time Zone naming I have a question related to the accepted standard for expressing the "Olsen" name where multiple zones exhibit the same "behaviour" in terms of belonging to the same country, having the same UTC offset and exactly the same DST rules. For example, it appears that all clocks within all locations within Argentina will have the same time all year round. The 12 zones reveal the same behaviour. The same is true of China and a number of other countries. I have been aware of the concept of a "consolidated" or "preferred" time zone which is a combined zone that takes the name of the most important location (eg. "America/Buenos_Aires" in the case of Argentina) Do these combined "super" zones exist? If so, is there information available that indicates how the individual zones roll up? My enquiry relates to a need to provide information that can identify the correct timezone for every place (city, postcode, county, state, etc etc) on earth via a back-end mapping service that calculates the spatial relationship between the place coordinate and the timezone boundary. I am looking to build up an accurate timezone boundary map essentially using existing map objects as building blocks. Many thanks -Martin Barnes ______________________ GeoData Manager Yahoo! Geo Technologies Geo Informatics team London

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Cuba 2004-2006
by hsv＠tbbs.net Dec. 7, 2008

Dec. 7, 2008

This looks queer: Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S Rule Cuba 2000 2006 - Apr Sun>=1 0:00s 1:00 D Rule Cuba 2006 max - Oct lastSun 0:00s 0 S I take the foregoing for something like this: ... 2003 Apr Sun>=1 0:00s 1:00 D 2003 Oct lastSun 0:00s 0 S 2004 Apr Sun>=1 0:00s 1:00 D 2005 Apr Sun>=1 0:00s 1:00 D 2006 Apr Sun>=1 0:00s 1:00 D 2006 Oct lastSun 0:00s 0 S ... but at those Aprils in 2005 and 2006 there is no real shift. Is this right?

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Western Samoa may implement Daylight Saving Time in 2009
by Alexander Krivenyshev Dec. 7, 2008

Dec. 7, 2008

The Samoa government (Western Samoa) may implement DST on the first Sunday of October 2009 (October 4, 2009) until the last Sunday of March 2010 (March 28, 2010). Selected Committee reports to Cabinet on Daylight Saving Time", Government of Samoa: http://www.govt.ws/pr_article.cfm?pr_id=560 or http://www.worldtimezone.com/dst_news/dst_news_samoa01.html Alexander Krivenyshev, http://www.worldtimezone.com/dst_news/ New York, NY

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FW: Incorrect time zone abbreviations for Indonesia
by Olson, Arthur David (NIH/NCI) [E] Dec. 5, 2008

Dec. 5, 2008

I'm forwarding this message from Jason Grimes, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. Note that time zone abbreviations are consistently abbreviations of the English-language names of time zones. --ado -----Original Message----- From: Jason Grimes [mailto:jg@proz.com] Sent: Wednesday, November 19, 2008 12:23 To: tz(a)lecserver.nci.nih.gov Cc: Jason Grimes Subject: Incorrect time zone abbreviations for Indonesia Dear time zone data maintainers, I'm a developer at ProZ.com, a website for human language translators. One of our users has reported that the time zone names for the time zones in Indonesia, specifically Asia/Jakarta, Asia/Pontianak, Asia/Makassar, and Asia/Jayapura, are incorrect in the current time zone data. According to her, and to the following references, it appears that these time zone abbreviations should be updated as follows: ID offset current new Asia/Jakarta UTC+7 WIT WIB (Waktu Indonesia Barat) Asia/Pontianak UTC+7 WIT WIB (Waktu Indonesia Barat) Asia/Makassar UTC+8 CIT WITA (Waktu Indonesia Tengah) Asia/Jayapura UTC+9 EIT WIT (Waktu Indonesia Timur) References: http://time.kim.lipi.go.id/ http://www.statoids.com/tid.html I noticed a similar bug report from 2005 but I was unable to find any resolution: http://article.gmane.org/gmane.linux.debian.devel.glibc/12741/match=indo nesia I hope this gives enough information to update these time zone names. Thanks to all of you who help to maintain this valuable resource. Best regards, Jason Grimes

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Nepal timezone spelling
by Phil Vandry Dec. 4, 2008

Dec. 4, 2008

Hello, I propose that the name of the Asia/Katmandu zone be changed to Asia/Kathmandu. Although Katmandu is an acceptable alternate spelling, I can attest, having recently returned from a holiday in Nepal, that it is hardly ever used. In fact, I saw no occurence at all of the spelling 'Katmandu' while inside the country. This patch keeps the Katmandu spelling for backward compatibility. After trying Asia/Kathmandu and then grepping the whole database for Kathmandu, I nearly concluded that this timezone definition was missing from the database before finally finding it under the alternate spelling! -Phil --- asia.orig 2008-10-08 08:35:57.000000000 -0400 +++ asia 2008-12-04 16:05:36.000000000 -0500 @@ -1474,7 +1474,7 @@ # Nepal # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Katmandu 5:41:16 - LMT 1920 +Zone Asia/Kathmandu 5:41:16 - LMT 1920 5:30 - IST 1986 5:45 - NPT # Nepal Time --- backward.orig 2008-09-09 22:33:26.000000000 -0400 +++ backward 2008-12-04 16:05:28.000000000 -0500 @@ -24,6 +24,7 @@ Link Asia/Ashgabat Asia/Ashkhabad Link Asia/Chongqing Asia/Chungking Link Asia/Dhaka Asia/Dacca +Link Asia/Kathmandu Asia/Katmandu Link Asia/Kolkata Asia/Calcutta Link Asia/Macau Asia/Macao Link Asia/Jerusalem Asia/Tel_Aviv

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Posix Timezone format
by Louis Guindon Dec. 2, 2008

Dec. 2, 2008

Hi All, My goal is to provide a user interface showing the information derived from the TZ zone name. Based on the selected TZ zone name by the user, I will assign the corresponding POSIX time zone string to the Linux /tmp/TZ file. This way the local time will show up properly for the user. However, I am having difficulty to find a reliable source for POSIX time zone string representation for each defined time zone in the Olson database. Also, the Olson database is changing many times a year which is making it difficult to hardcode anything in advance. I am sure that my problem already encountered by someone on this mailing list and I am wandering if there is a way to query the current version of the Olson database with some tool to return the related POSIX representation for the requested time zone. I don't know if there is an alternative way, but I am also wandering if the TZ time zone name can used directly without going through the POSIX representation of the time zone. Note: POSIX time zone representation for me is the following. The TZ zone name America/Los_angeles is represented as PST8PDT,M3.2.0,M11.1.0. Regards, Louis Guindon PMC-Sierra Senior System Design Engineer

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