January 2008 - tz - lists.iana.org

proposed leapseconds change
by Arthur David Olson 22 Jan '08

22 Jan '08

Here's a proposed change to leapseconds to reflect the new IERS bulletin. --ado ------- leapseconds ------- *** /tmp/geta9338 Tue Jan 22 10:49:08 2008 --- /tmp/getb9338 Tue Jan 22 10:49:08 2008 *************** *** 1,4 **** ! # @(#)leapseconds 8.4 # Allowance for leapseconds added to each timezone file. --- 1,4 ---- ! # @(#)leapseconds 8.5 # Allowance for leapseconds added to each timezone file. *************** *** 46,71 **** Leap 2005 Dec 31 23:59:60 + S # 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, 28 June 2007 # ! # Bulletin C 34 # ! # 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 December 2007. # The difference between Coordinated Universal Time UTC and the # International Atomic Time TAI is : # --- 46,72 ---- Leap 2005 Dec 31 23:59:60 + S # 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, 18 January 2008 # ! # Bulletin C 35 # ! # 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 2008. # The difference between Coordinated Universal Time UTC and the # International Atomic Time TAI is : # *************** *** 77,82 **** # will be no time step at the next possible date. # # Daniel GAMBIS ! # Director ! # Earth Orientation Center of IERS # Observatoire de Paris, France --- 78,83 ---- # will be no time step at the next possible date. # # Daniel GAMBIS ! # Head ! # Earth Orientation Center of the IERS # Observatoire de Paris, France

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FW: Bulletin C35
by Olson, Arthur David (NIH/NCI) [E] 22 Jan '08

22 Jan '08

I'm forwarding this message from Sascha Wildner (see below). --ado -----Original Message----- From: Sascha Wildner [mailto:swildner@erpicon.de] Sent: Friday, January 18, 2008 4:54 To: Olson, Arthur David (NIH/NCI) [E] Subject: Bulletin C35 Hi, Bulletin C35 is out, thus leapseconds needs slight adjustment in the next patch. http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat [sending this off-list because I can't send mails from here using the address with which I'm subscribed to the list, and it seems that in this case my mails don't appear on the list anyway] Best regards, -- Sascha Wildner erpicon Software Development GmbH Neusser Str. 724-726 50737 Köln Germany Phone: +49 221 9746089 Fax: +49 221 9746099 Mobile: +49 174 9887655 eMail: swildner(a)erpicon.de

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Microsoft San Luis "confirmation"
by Jesper Norgaard Welen 20 Jan '08

20 Jan '08

It turns out that Microsoft has acted more proactively than even tz database or World Time Explorer, in setting up a page for the San Luis inhabitants that by now will wake up Monday morning to a new schedule, one hour behind the rest of the country. The page about how to change Windows operating systems to accomodate the San Luis change, however they don't specify a new timezone, instead the rather more relaxed solution to go back to either the timezones "(GMT-3) Buenos Aires, Georgetown" or the intermediate timezone "(GMT-3) Georgetown" which both represents GMT-3 without DST implementation all year round: http://www.microsoft.com/argentina/dst/sanluis.aspx The below page recommends how to change the Argentina DST timezone properly to have the start and end times for the Argentina-country-wide change effectuated the 30.th. of December 2007: http://www.microsoft.com/argentina/dst/actualizacion.aspx At the time of writing it is Sunday 2007-01-20 22:35 CST -0600 and so it should be Monday 2007-01-21 02:35 ADT -0200 in most of Argentina and Monday 2007-01-21 1:35 SLST -0300 in the San Luis province. (I invented SLST for San Luis Standard Time, it is certainly not an official abbreviation!) Are there any news "on the ground" in San Luis that the change is going ahead? I'll take action tomorrow for WTE if this is the case. 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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Re: Why does localtime() call tzset() but localtime_r() not?
by Robbin Kawabata 18 Jan '08

18 Jan '08

Note the latest Open Group localtime_r() man page excerpt below says localtime_r() should behave similarly to localtime() by calculating a time according to the timezone. Note the Change History description that on XSI systems, localtime_r() should set tzname, daylight, timezone - this is advisory, not mandatory; Change History is always advisory, and the word "should" (vs. "shall") is used. >From our standards person: "But, the normative text doesn't make it mandatory either. The way I read it, an implementation of localtime_r() is allowed to set tzname, but is not required to do so. If the implementation sets tzname, it is also allowed to set both daylight and timezone, but is not required to do so. If the implementation doesn't set tzname to match the converted time, it is not allowed to change either daylight or timezone." From: http://www.opengroup.org/onlinepubs/000095399/functions/localtime.html The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2004 Edition Copyright ? 2001-2004 The IEEE and The Open Group, All Rights reserved. NAME localtime, localtime_r - convert a time value to a broken-down local time ... DESCRIPTION ... The relationship between a time in seconds since the Epoch used as an argument to localtime() and the tm structure (defined in the <time.h> header) is that the result shall be as specified in the expression given in the definition of seconds since the Epoch (see the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.14, Seconds Since the Epoch) corrected for timezone and any seasonal time adjustments, where the names in the structure and in the expression correspond. [Option End] [TSF] [Option Start] The same relationship shall apply for localtime_r(). [Option End] <<== ... [TSF] [Option Start] The localtime_r() function shall convert the time in seconds since the Epoch pointed to by timer into a broken-down time stored in the structure to which result points. The localtime_r() function shall also return a pointer to that same structure. TSF If the reentrant version does not set tzname, it shall not set daylight and shall not set timezone. ... CHANGE HISTORY ... Issue 6 ... IEEE Std 1003.1-2001/Cor 2-2004, item XSH/TC2/D6/56 is applied, adding a requirement that if localtime_r() does not set the tzname variable, it shall not set the daylight or timezone variables. On systems supporting XSI, the daylight, timezone, and tzname variables should all be set to provide information for the same timezone. This updates the description of localtime_r() to mention daylight and timezone as well as tzname. The SEE ALSO section is updated. > Date: Fri, 11 Jan 2008 14:59:45 -0800 > From: Paul Eggert <eggert(a)CS.UCLA.EDU> > Subject: Re: Why does localtime() call tzset() but localtime_r() not? > To: tz(a)lecserver.nci.nih.gov > Cc: Time Zone Mailing List <tz(a)lecserver.nci.nih.gov> > > "Jonathan Leffler" <jonathan.leffler(a)gmail.com> writes: > > > I guess the POSIX manual allows this > > POSIX is incoherent in this area. It places hardly any requirements > on localtime_r; for example, localtime_r can be an alias for gmtime_r. > > I think the intent is that localtime_r have read-only access to the > internal data that tzset initializes. However, there's no clear POSIX > requirement on the application to call tzset before calling > localtime_r, nor there is any requirement on the implementation to > behave as if tzset were called before execution begins. > > Since the standard is fuzzy in this area, portable code should invoke > tzset (or localtime or mktime or strftime) before invoking localtime_r. >

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Changing the DST
by praveen.patle＠us.abb.com 17 Jan '08

17 Jan '08

Hello: We are trying to simulate the DST in our test environment. As part of this process, we want to modify the rules so that the short day and long day can be any day we choose. Currently, we chose lastSun of Feb as short day and lastSun of March as long day. Can you please provide us an example as to what needs to be changed in the "northamerica" file? We have changed the following in "northamerica" file: ---------------------------- # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule US 2007 max - Feb lastSun 2:00 0:00 D Rule US 2007 max - Mar lastSun 2:00 0 S --------------------------------------- Is there any other place we need to change in "northamerica" file? This northamerica file is from the tzdata version "tzdata2007k" The problem with this change is that one hour is being added to every hour subsequent to last Sunday in Feb until the actual Short day (March 9). After March 9, one hour is substracted from wall time from every hour until the actual Long Day (Nov 2). Are there any known bugs/fixes to "javazic" code? Your help will be very much appreciated. Best Regards, Praveen

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Argentina Province San Luis is planning to end DST earlier
by Alex Krivenyshev 17 Jan '08

17 Jan '08

Here are articles that Argentina Province San Luis is planning to end DST as earlier as upcoming Monday January 21, 2008 or February 2008: Provincia argentina retrasa reloj y marca diferencia con resto del país (Argentine Province delayed clock and mark difference with the rest of the country) http://cl.invertia.com/noticias/noticia.aspx? idNoticia=200801171849_EFE_ET4373&idtel Es inminente que en San Luis atrasen una hora los relojes (It is imminent in San Luis clocks one hour delay) http://www.lagaceta.com.ar/vernotae.asp?id_nota=253414 http://www.worldtimezone.net/dst_news/dst_news_argentina02.html Alex Krivenyshev, http://www.worldtimezone.com/dst_news/ New York, NY

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Typo
by Sascha Wildner 17 Jan '08

17 Jan '08

Small nit.. There's a typo in the README file: 'covar' should be 'cover' I think. Regards, Sascha

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Re: SunOS and timelocal, timegm, tzsetwall
by Robbin Kawabata 16 Jan '08

16 Jan '08

timelocal(), timegm(), tzsetwall() are no longer in SunOS. I believe they were replaced in SunOS 5.0 (by mktime(), localtime(), tzset()). Robbin > Date: Thu, 10 Jan 2008 22:13:09 -0800 > From: Jonathan Leffler <jonathan.leffler(a)gmail.com> > Subject: SunOS and timelocal, timegm, tzsetwall > To: Time Zone Mailing List <tz(a)lecserver.nci.nih.gov> > > In Makefile (for tzcode2007k), there are the comments: > > # Sun has provided "tzsetwall", "timelocal", and "timegm" in SunOS 4.0. > # These functions may well disappear in future releases of the time > # conversion package. > > For Solaris 8 (SunOS 5.8) and Solaris 10 (SunOS 5.10), neither the standard > C library nor any other shared library in /lib or /usr/lib defines or > references tzsetwall, timelocal or timegm -- the functions no longer exist > in Solaris. I was checking on SPARC rather than Intel, but I would not > expect that to matter in practice. > > You can, however, find references for these functions for Solaris 2.5 (aka > SunOS 5.5) and Solaris 2.6 (SunOS 5.6) if you Google "site:sun.comtzsetwall" - ( > 2.5: http://docs.sun.com/app/docs/doc/802-1930-03/6i5u95utq?a=view; 2.6: > http://docs.sun.com/app/docs/doc/802-5747-03/6i9g1bha0?l=ko&a=view) > Interestingly, there is a Solaris 8 manual page ( > http://docs.sun.com/app/docs/doc/806-0627/6j9vhfn9n?l=ko&a=view) that > mentions tzsetwall (but not timegm or timelocal), but I still can't find the > function in any of the shared libraries on a representative Solaris 8 > machine. There is a 'Solaris 8 Transition Guide' at > http://docs.sun.com/app/docs/doc/805-6331/6j5vgg6bv?a=view which mentions > all three - describing their replacements. > > -- > Jonathan Leffler <jonathan.leffler(a)gmail.com> #include <disclaimer.h> > Guardian of DBD::Informix - v2007.0914 - http://dbi.perl.org > "Blessed are we who can laugh at ourselves, for we shall never cease to be > amused."

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goahead and goback
by Arthur David Olson 15 Jan '08

15 Jan '08

This is the type of change needed to handle Pacific Presidential Election Time. --ado ------- localtime.c ------- *** /tmp/geta22490 Tue Jan 15 13:31:40 2008 --- /tmp/getb22490 Tue Jan 15 13:31:40 2008 *************** *** 5,11 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 8.8"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 5,11 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 8.9"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 555,570 **** sp->ttis[sp->typecnt++] = ts.ttis[1]; } } ! i = 2 * YEARSPERREPEAT; ! sp->goback = sp->goahead = sp->timecnt > i; ! sp->goback = sp->goback && ! typesequiv(sp, sp->types[i], sp->types[0]) && ! differ_by_repeat(sp->ats[i], sp->ats[0]); ! sp->goahead = sp->goahead && ! typesequiv(sp, sp->types[sp->timecnt - 1], ! sp->types[sp->timecnt - 1 - i]) && ! differ_by_repeat(sp->ats[sp->timecnt - 1], ! sp->ats[sp->timecnt - 1 - i]); return 0; } --- 555,577 ---- sp->ttis[sp->typecnt++] = ts.ttis[1]; } } ! sp->goback = sp->goahead = FALSE; ! if (sp->timecnt > 1) { ! for (i = 1; i < sp->timecnt; ++i) ! if (typesequiv(sp, sp->types[i], sp->types[0]) && ! differ_by_repeat(sp->ats[i], sp->ats[0])) { ! sp->goback = TRUE; ! break; ! } ! for (i = sp->timecnt - 2; i >= 0; --i) ! if (typesequiv(sp, sp->types[sp->timecnt - 1], ! sp->types[i]) && ! differ_by_repeat(sp->ats[sp->timecnt - 1], ! sp->ats[i])) { ! sp->goahead = TRUE; ! break; ! } ! } return 0; }

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Does any one remember the logic behind sp->goback and sp->goahead in localtime.c?
by Jonathan Leffler 15 Jan '08

15 Jan '08

AFAICT, the logic associated with sp->goback and sp->goahead in tzload() and in localsub() in localtime.c could only ever be used if there were at least 800 time change entries, enough for two per year for a 400 year cycle. And, empirically, there are no time zone definitions in the current (2007k) data set that get anywhere close to this. However, this code can't have been put in there for no reason whatsoever, so I'd like to understand what was the intention - if anybody can remember. -- Jonathan Leffler <jonathan.leffler(a)gmail.com> #include <disclaimer.h> Guardian of DBD::Informix - v2007.0914 - http://dbi.perl.org "Blessed are we who can laugh at ourselves, for we shall never cease to be amused."

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