- tz - lists.iana.org

Time Zones 1914
by Hall, Jr., Owen Jan. 29, 2005

Jan. 29, 2005

Hi, I am doing some research on the Goeben during August 4 - 8, 1914. Do you know the time zone for Rome and Messina during this period? Today they are GMT +1. Thanks in advance. Professor Hall

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Time in Ireland
by Joseph S. Myers Jan. 26, 2005

Jan. 26, 2005

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Proposed changes to localtime.c, zic.c, and Makefile
by Olson, Arthur David (NIH/NCI) Jan. 24, 2005

Jan. 24, 2005

Here are proposed changes to: 1. localtime.c, to include "float.h" for the benefit of some gcc systems (thanks to Bradley White for finding the problem). 2. zic.c, to complain about links to links if the "-v" flag is used. 3. Makefile, to ensure that a "make public" is done with the benefit of gcc diagnostics. --ado ------- localtime.c ------- *** /tmp/geta15164 Mon Jan 24 12:20:36 2005 --- /tmp/getb15164 Mon Jan 24 12:20:36 2005 *************** *** 5,11 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.89"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 5,11 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.90"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 20,25 **** --- 20,26 ---- #include "private.h" #include "tzfile.h" #include "fcntl.h" + #include "float.h" /* for FLT_MAX and DBL_MAX */ /* ** SunOS 4.1.1 headers lack O_BINARY. ------- zic.c ------- *** /tmp/geta15183 Mon Jan 24 12:20:47 2005 --- /tmp/getb15183 Mon Jan 24 12:20:47 2005 *************** *** 1,4 **** ! static char elsieid[] = "@(#)zic.c 7.118"; /* ** Regardless of the type of time_t, we do our work using this type. --- 1,4 ---- ! static char elsieid[] = "@(#)zic.c 7.119"; /* ** Regardless of the type of time_t, we do our work using this type. *************** *** 579,584 **** --- 579,589 ---- for (i = 0; i < nlinks; ++i) { eat(links[i].l_filename, links[i].l_linenum); dolink(links[i].l_from, links[i].l_to); + if (noise) + for (j = 0; j < nlinks; ++j) + if (strcmp(links[i].l_to, + links[j].l_from) == 0) + warning("link to link"); } if (lcltime != NULL) { eat("command line", 1); ------- Makefile ------- *** /tmp/geta15240 Mon Jan 24 12:21:57 2005 --- /tmp/getb15240 Mon Jan 24 12:21:57 2005 *************** *** 1,4 **** ! # @(#)Makefile 7.103 # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). --- 1,4 ---- ! # @(#)Makefile 7.104 # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). *************** *** 384,390 **** # The zics below ensure that each data file can stand on its own. ! public: $(ENCHILADA) zic -mkdir /tmp/,tzpublic -for i in $(TDATA) ; do zic -v -d /tmp/,tzpublic $$i 2>&1 | grep -v "starting year" ; done for i in $(TDATA) ; do zic -d /tmp/,tzpublic $$i || exit; done --- 384,392 ---- # The zics below ensure that each data file can stand on its own. ! public: ! make maintainer-clean ! make "CFLAGS=$(GCC_DEBUG_FLAGS)" -mkdir /tmp/,tzpublic -for i in $(TDATA) ; do zic -v -d /tmp/,tzpublic $$i 2>&1 | grep -v "starting year" ; done for i in $(TDATA) ; do zic -d /tmp/,tzpublic $$i || exit; done

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FW: For TZ list
by Olson, Arthur David (NIH/NCI) Jan. 23, 2005

Jan. 23, 2005

Mark Brader is not on the time zone mailing list; direct replies appropriately. --ado In a book that I'm currently reading¹, there is reproduced a Pan American Airways timeables from 1936, for their weekly "Orient Express" flights between San Francisco and Manila, and connecting flights to Chicago and the US East Coast. As it uses some time zone designations that I've never seen before, I thought the readers of the tz list might be interested. It's only a few lines, so I'll type in the entire timetable (omitting the connecting flights) for those of you might be interested. In the original, AM and PM are shown as light and bold type, and noon is N; I'll use A, P, and N respectively here. As with many railway timetables, the right-hand side reads upward. --------------------------------------------------------------------- Wed. 3:00P Lv. SAN FRANCISCO (Alameda), U.S.A. P.S.T. Ar.10:30A Tues. Thur.8:30A Ar. HONOLOLU (Pearl Harbor), H.I. H.L.T. Lv.12:00N Mon. Fri. 6:30A Lv. HONOLOLU (Pearl Harbor), H.I. H.L.T. Ar. 5:30P Sun. " 3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A " Sat. 6:00A Lv. MIDWAY ISLAND . . . . . . . . . M.L.T. Ar. 5:00P Sat. (International Date Line) Sun. 3:00P Ar. WAKE ISLANDS . . . . . . . . . . 165° Lv. 6:00A Sun. Mon. 6:00A Lv. WAKE ISLANDS . . . . . . . . . . " Ar. 7:00P Sat. " 5:00P Ar. GUAM ISLAND . . . . . . . . . . 150° Lv. 6:00A " Tue. 6:00A Lv. GUAM ISLAND . . . . . . . . . . " Ar. 6:30P Fri. " 5:00P Ar. MANILA (Cavite), P.I. . . . . . 120° Lv. 4:00A* " ---------------------------------------------------------------------- *Departures from Manila subject to advancement to previous afternoon as occasion demands. All times are approximate other than at San Francisco Westbound and at Honolulu Eastbound. ---------------------------------------------------------------------- Clearly 120°, 150°, and 165° indicate time zones -8, -10, and -11; I guess H.L.T. and M.L.T. refer to Hawaii and Midway "Local Time". ¹Fallacies and Fantasies of Air Transport History, by R.E.G. Davies, published 1994 by Paladwr Press, McLean, VA, USA; ISBN 0-9626483-5-3. -- Mark Brader "I like to think of [this] as self-explanatory." Toronto "I hope *I* think of [it] that way." msb(a)vex.net -- Donald Westlake: "Trust Me On This" --E3771ED93.1106330125/shell.vex.net--

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Re: Defect in XSH strftime
by Paul Eggert Jan. 21, 2005

Jan. 21, 2005

In <https://www.opengroup.org/sophocles/show_mail.tpl?source=L&listname=austin-…>, Eric Blake <ebb9(a)byu.net> writes: > this means that %Y is not equivalent to %C%y, since %C is documented > to be exactly two digits This topic came up around 2004-08-20 in the tz mailing list. (Please see <http://www.twinsun.com/tz/tz-link.htm> for info about the list; it is archived in <ftp://elsie.nci.nih.gov/pub/tzarchive.gz>.) The consensus was as follows (presumably a defect report could also be submitted to POSIX, as POSIX can place requirements on strftime that are over and above what ISO C requires): * The ISO C standard is broken in this area; the standardizers did not think about the problem. (One of those involved in the tz discussion was also involved with the ISO C effort.) * A Defect Report should be submitted. (Nobody has yet done so, to my knowledge.) * Best practice (which is not currently required by any standard) is to have the following behavior, originally suggested by Arthur David Olson: - %Y always generates the mathematically-correct result, even if the expression "tm.tm_year + 1900" would overflow. - %Y is always equivalent to %C%y. - %y is always in the range [00,99]. - %C is in the range [00,99] when possible. - %C is two characters long when possible. Here are some examples: %Y %C %y 10000 100 00 9999 99 99 0999 09 99 0099 00 99 0001 00 01 0000 00 00 -001 -0 01 -099 -0 99 -999 -9 99 -1000 -10 00 -10000 -100 00 %Y %C %y -2147481749 -21474817 49 2147485547 21474855 47 Note that the last example overflows 32-bit 'int', but it is the best-practice behavior even on 32-bit-int hosts. * The tz library <ftp://elsie.nci.nih.gov/pub/> now has the best-practice behavior suggested above.

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Tzcode2005c.tar.gz and tzdata2005c.tar.gz
by Olson, Arthur David (NIH/NCI) Jan. 17, 2005

Jan. 17, 2005

The files... ftp://elsie.nci.nih.gov/pub/tzcode2005c.tar.gz ...and... ftp://elsie.nci.nih.gov/pub/tzdata2005c.tar.gz ...are now available; these incorporate the changes circulated last week on the time zone mailing list to get better results when mktime runs on a system where time_t is double, along with changes to the data files (most importantly to Paraguay). Next up on the schedule: have zic warn about links to links. --ado

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IANA time zone registration - proposal
by Doug Royer Jan. 17, 2005

Jan. 17, 2005

[This was sent to some IETF mailing lists by me and someone suggested I send it to this list also] This is REV -00 of the proposal - comments welcome. Data in in it can easily updated. (Like the TZ names updated to latest copy of data) ---------------------------------------------------- A couple of years ago there was talk on the CALSCH mailing list to have an IANA time zone registration process. I have submitted a proposal for that registry to the IETF. A copy can be found at: http://inet-consulting.com/draft-royer-timezone-registry-00.txt And an HTML version: http://inet-consulting.com/draft-royer-timezone-registry-00.html I am adding the POLYGON property targeted for the -01 version that has an ADD/DELETE parameter to allow for the optional inclusion of latitude/longitude geographic areas to be included that include (add) and exclude (delete) areas from the time zone geographic region (again from the CALSCH mailing list discussions). -- Doug Royer | http://INET-Consulting.com -------------------------------|----------------------------- Doug(a)Royer.com | Office: (208)612-4638 http://Royer.com | Fax: (866)594-8574 | Cell: (208)520-4044 We Do Standards - You Need Standards

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RE: question about asia/baku 1992
by Olson, Arthur David (NIH/NCI) Jan. 14, 2005

Jan. 14, 2005

This partial output from "zdump -v Asia/Baku" indicates that there is indeed something peculiar happening around 1991 and 1992; does anyone know if the output reflects reality? --ado ... Asia/Baku Sat Mar 24 21:59:59 1990 UTC = Sun Mar 25 01:59:59 1990 BAKT isdst=0 Asia/Baku Sat Mar 24 22:00:00 1990 UTC = Sun Mar 25 03:00:00 1990 BAKST isdst=1 Asia/Baku Sat Sep 29 21:59:59 1990 UTC = Sun Sep 30 02:59:59 1990 BAKST isdst=1 Asia/Baku Sat Sep 29 22:00:00 1990 UTC = Sun Sep 30 02:00:00 1990 BAKT isdst=0 Asia/Baku Sat Mar 30 21:59:59 1991 UTC = Sun Mar 31 01:59:59 1991 BAKT isdst=0 Asia/Baku Sat Mar 30 22:00:00 1991 UTC = Sun Mar 31 02:00:00 1991 BAKST isdst=1 Asia/Baku Thu Aug 29 19:59:59 1991 UTC = Thu Aug 29 23:59:59 1991 BAKST isdst=1 Asia/Baku Thu Aug 29 20:00:00 1991 UTC = Fri Aug 30 00:00:00 1991 AZST isdst=1 Asia/Baku Sat Sep 28 22:59:59 1991 UTC = Sun Sep 29 02:59:59 1991 AZST isdst=1 Asia/Baku Sat Sep 28 23:00:00 1991 UTC = Sun Sep 29 02:00:00 1991 AZT isdst=0 Asia/Baku Sat Mar 28 19:59:59 1992 UTC = Sat Mar 28 22:59:59 1992 AZT isdst=0 Asia/Baku Sat Mar 28 20:00:00 1992 UTC = Sun Mar 29 00:00:00 1992 AZST isdst=1 Asia/Baku Sat Sep 26 18:59:59 1992 UTC = Sat Sep 26 22:59:59 1992 AZST isdst=1 Asia/Baku Sat Sep 26 19:00:00 1992 UTC = Sat Sep 26 22:00:00 1992 AZT isdst=0 Asia/Baku Sat Sep 26 22:59:59 1992 UTC = Sun Sep 27 01:59:59 1992 AZT isdst=0 Asia/Baku Sat Sep 26 23:00:00 1992 UTC = Sun Sep 27 03:00:00 1992 AZT isdst=0 Asia/Baku Sun Dec 31 19:59:59 1995 UTC = Sun Dec 31 23:59:59 1995 AZT isdst=0 Asia/Baku Sun Dec 31 20:00:00 1995 UTC = Mon Jan 1 01:00:00 1996 AZST isdst=1 Asia/Baku Sun Oct 27 00:59:59 1996 UTC = Sun Oct 27 05:59:59 1996 AZST isdst=1 Asia/Baku Sun Oct 27 01:00:00 1996 UTC = Sun Oct 27 05:00:00 1996 AZT isdst=0 Asia/Baku Sat Mar 29 20:59:59 1997 UTC = Sun Mar 30 00:59:59 1997 AZT isdst=0 Asia/Baku Sat Mar 29 21:00:00 1997 UTC = Sun Mar 30 02:00:00 1997 AZST isdst=1 Asia/Baku Sat Oct 25 19:59:59 1997 UTC = Sun Oct 26 00:59:59 1997 AZST isdst=1 Asia/Baku Sat Oct 25 20:00:00 1997 UTC = Sun Oct 26 00:00:00 1997 AZT isdst=0 ...

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FW: question about asia/baku 1992
by Olson, Arthur David (NIH/NCI) Jan. 13, 2005

Jan. 13, 2005

Klaus Schmid is not on the time zone mailing list; direct replies appropriately. --ado >From klaus.schmid(a)wtal.de Mon Jan 10 20:28:02 2005 Return-Path: <klaus.schmid(a)wtal.de> Received: from smtp.tal.de (s05.tal.de [81.92.0.8]) by lecserver.nci.nih.gov (8.12.10/8.12.10) with ESMTP id j0B1RSHG000047 for <tz(a)elsie.nci.nih.gov>; Mon, 10 Jan 2005 20:27:29 -0500 (EST) Received: from [85.74.4.109] (J046d.j.pppool.de [85.74.4.109]) by smtp.tal.de (SMTP.TAL.DE) with ESMTP id 23F336F9C3 for <tz(a)elsie.nci.nih.gov>; Sun, 9 Jan 2005 23:43:59 +0100 (CET) Message-ID: <41E1B3AF.4030606(a)wtal.de> Date: Sun, 09 Jan 2005 23:43:59 +0100 From: Klaus Schmid <klaus.schmid(a)wtal.de> User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: tz(a)lecserver.nci.nih.gov Subject: question about asia/baku 1992 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Status: RO Dear List, I have a question about the following data lines # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule RussiaAsia 1992 only - Mar lastSat 23:00 1:00 S Rule RussiaAsia 1992 only - Sep lastSat 23:00 0 - # i.e. Sep 26 Rule RussiaAsia 1993 max - Mar lastSun 2:00s 1:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Baku 3:00 1:00 BAKST 1991 Aug 30 # independence 3:00 RussiaAsia AZ%sT 1992 Sep lastSun 2:00s # i.e. Sep 27 4:00 - AZT 1996 # Azerbaijan time Now if I try to interprete these lines I get: from 1992 Mar to 1992 Sep 26 23:00 (local): GMTOFF= 3:00 and SAVE= 1:00 i.e. LOCALOFF= +4:00 ==> 1992 Sep 26 23:00 (local) == 1992 Sep 26 19:00 zulu from 1992 Sep 26 19:00 zulu to 1992 Sep 26 23:00 zulu: GMTOFF= LOCALOFF= +3:00 from 1992 Sep 26 23:00 zulu to 1996: GMTOFF= LOCALOFF= +4:00 This would mean a local offset change ocurred for only four hours. Is this correct? Best Regards, Klaus Schmid

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Revised mktime on systems with exotic time_t types
by Olson, Arthur David (NIH/NCI) Jan. 13, 2005

Jan. 13, 2005

Thanks to Paul Eggert and Ken Pizzini for checking the proposed changes to improve mktime on systems with exotic time_t types. Below find a revised version of the changes; as usual for yours truly, these are relative to what's currently available using ftp. With providence, a new version of the time zone stuff incorporating these changes and Paul's proposed data changes will go out next week. --ado ------- localtime.c ------- *** /tmp/geta10193 Thu Jan 13 09:58:48 2005 --- /tmp/getb10193 Thu Jan 13 09:58:48 2005 *************** *** 1,9 **** /* - ** XXX--have mktime et al. do the right thing when time_t is exotic - ** (for example, double). - */ - - /* ** This file is in the public domain, so clarified as of ** 1996-06-05 by Arthur David Olson (arthur_david_olson(a)nih.gov) */ --- 1,4 ---- *************** *** 10,16 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.86"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 5,11 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.89"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 1061,1067 **** for (i = 1; i < sp->timecnt; ++i) if (t < sp->ats[i]) break; ! i = sp->types[i - 1]; } ttisp = &sp->ttis[i]; /* --- 1056,1062 ---- for (i = 1; i < sp->timecnt; ++i) if (t < sp->ats[i]) break; ! i = (int) sp->types[i - 1]; } ttisp = &sp->ttis[i]; /* *************** *** 1092,1102 **** */ struct tm * ! localtime_r(timep, tm) const time_t * const timep; ! struct tm * tm; { ! return localsub(timep, 0L, tm); } /* --- 1087,1097 ---- */ struct tm * ! localtime_r(timep, tmp) const time_t * const timep; ! struct tm * tmp; { ! return localsub(timep, 0L, tmp); } /* *************** *** 1154,1164 **** */ struct tm * ! gmtime_r(timep, tm) const time_t * const timep; ! struct tm * tm; { ! return gmtsub(timep, 0L, tm); } #ifdef STD_INSPIRED --- 1149,1159 ---- */ struct tm * ! gmtime_r(timep, tmp) const time_t * const timep; ! struct tm * tmp; { ! return gmtsub(timep, 0L, tmp); } #ifdef STD_INSPIRED *************** *** 1338,1346 **** const time_t * const timep; char * buf; { ! struct tm tm; ! return asctime_r(localtime_r(timep, &tm), buf); } /* --- 1333,1341 ---- const time_t * const timep; char * buf; { ! struct tm mytm; ! return asctime_r(localtime_r(timep, &mytm), buf); } /* *************** *** 1441,1450 **** { register const struct state * sp; register int dir; - register int bits; register int i, j; register int saved_seconds; register long li; long y; time_t newt; time_t t; --- 1436,1446 ---- { register const struct state * sp; register int dir; register int i, j; register int saved_seconds; register long li; + register time_t lo; + register time_t hi; long y; time_t newt; time_t t; *************** *** 1518,1545 **** yourtm.tm_sec = 0; } /* ! ** Divide the search space in half ! ** (this works whether time_t is signed or unsigned). */ ! bits = TYPE_BIT(time_t) - 1; ! /* ! ** If time_t is signed, then 0 is just above the median, ! ** assuming two's complement arithmetic. ! ** If time_t is unsigned, then (1 << bits) is just above the median. ! */ ! t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits); for ( ; ; ) { ! if ((*funcp)(&t, offset, &mytm) == NULL) ! return WRONG; /* XXX probably wrong */ ! dir = tmcomp(&mytm, &yourtm); if (dir != 0) { ! if (bits-- < 0) return WRONG; ! if (bits < 0) ! --t; /* may be needed if new t is minimal */ ! else if (dir > 0) ! t -= ((long) 1) << bits; ! else t += ((long) 1) << bits; continue; } if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) --- 1514,1562 ---- yourtm.tm_sec = 0; } /* ! ** Do a binary search (this works whatever time_t's type is). */ ! if (!TYPE_SIGNED(time_t)) { ! lo = 0; ! hi = lo - 1; ! } else if (!TYPE_INTEGRAL(time_t)) { ! if (sizeof(time_t) > sizeof(float)) ! hi = (time_t) DBL_MAX; ! else hi = (time_t) FLT_MAX; ! lo = -hi; ! } else { ! lo = 1; ! for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) ! lo *= 2; ! hi = -(lo + 1); ! } for ( ; ; ) { ! t = lo / 2 + hi / 2; ! if (t < lo) ! t = lo; ! else if (t > hi) ! t = hi; ! if ((*funcp)(&t, offset, &mytm) == NULL) { ! /* ! ** Assume that t is too extreme to be represented in ! ** a struct tm; arrange things so that it is less ! ** extreme on the next pass. ! */ ! dir = (t > 0) ? 1 : -1; ! } else dir = tmcomp(&mytm, &yourtm); if (dir != 0) { ! if (t == lo) { ! ++t; ! ++lo; ! } else if (t == hi) { ! --t; ! --hi; ! } ! if (lo > hi) return WRONG; ! if (dir > 0) ! hi = t; ! else lo = t; continue; } if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) *************** *** 1569,1575 **** newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; if ((*funcp)(&newt, offset, &mytm) == NULL) ! return WRONG; /* XXX probably wrong */ if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) --- 1586,1592 ---- newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; if ((*funcp)(&newt, offset, &mytm) == NULL) ! continue; if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) ------- Makefile ------- *** /tmp/geta10212 Thu Jan 13 09:58:57 2005 --- /tmp/getb10212 Thu Jan 13 09:58:57 2005 *************** *** 1,4 **** ! # @(#)Makefile 7.102 # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). --- 1,4 ---- ! # @(#)Makefile 7.103 # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). *************** *** 396,404 **** typecheck: make clean ! for i in "long long" double unsigned; \ do \ ! make CFLAGS="-D_TIME_T \"-Dtime_t=$$i\"" ; \ ./zdump -v US/Eastern ; \ make clean ; \ done --- 396,404 ---- typecheck: make clean ! for i in "long long" unsigned double; \ do \ ! make CFLAGS="-DTYPECHECK -D_TIME_T \"-Dtime_t=$$i\"" ; \ ./zdump -v US/Eastern ; \ make clean ; \ done ------- zdump.c ------- *** /tmp/geta10231 Thu Jan 13 09:59:07 2005 --- /tmp/getb10231 Thu Jan 13 09:59:07 2005 *************** *** 1,4 **** ! static char elsieid[] = "@(#)zdump.c 7.59"; /* ** This code has been made independent of the rest of the time --- 1,4 ---- ! static char elsieid[] = "@(#)zdump.c 7.61"; /* ** This code has been made independent of the rest of the time *************** *** 149,159 **** static long delta P((struct tm * newp, struct tm * oldp)); static void dumptime P((const struct tm * tmp)); static time_t hunt P((char * name, time_t lot, time_t hit)); ! static void setabsolutes(); static void show P((char * zone, time_t t, int v)); static const char * tformat P((void)); static time_t yeartot P((long y)); int main(argc, argv) int argc; --- 149,195 ---- static long delta P((struct tm * newp, struct tm * oldp)); static void dumptime P((const struct tm * tmp)); static time_t hunt P((char * name, time_t lot, time_t hit)); ! static void setabsolutes P((void)); static void show P((char * zone, time_t t, int v)); static const char * tformat P((void)); static time_t yeartot P((long y)); + #ifndef TYPECHECK + #define my_localtime localtime + #else /* !defined TYPECHECK */ + static struct tm * + my_localtime(tp) + time_t * tp; + { + register struct tm * tmp; + + tmp = localtime(tp); + if (tp != NULL && tmp != NULL) { + struct tm tm; + register time_t t; + + tm = *tmp; + t = mktime(&tm); + if (t - *tp >= 1 || *tp - t >= 1) { + (void) fflush(stdout); + (void) fprintf(stderr, "\n%s: ", progname); + (void) fprintf(stderr, tformat(), *tp); + (void) fprintf(stderr, " ->"); + (void) fprintf(stderr, " sec %d", tmp->tm_sec); + (void) fprintf(stderr, " min %d", tmp->tm_min); + (void) fprintf(stderr, " hour %d", tmp->tm_hour); + (void) fprintf(stderr, " mday %d", tmp->tm_mday); + (void) fprintf(stderr, " mon %d", tmp->tm_mon); + (void) fprintf(stderr, " year %d", tmp->tm_year); + (void) fprintf(stderr, " -> "); + (void) fprintf(stderr, tformat(), t); + (void) fprintf(stderr, "\n"); + } + } + return tmp; + } + #endif /* !defined TYPECHECK */ + int main(argc, argv) int argc; *************** *** 208,219 **** if (cutarg != NULL) { long lo; long hi; ! char c; ! if (sscanf(cutarg, "%ld%c", &hi, &c) == 1) { cuthiyear = hi; } else if (sscanf(cutarg, "%ld,%ld%c", ! &lo, &hi, &c) == 2) { cutloyear = lo; cuthiyear = hi; } else { --- 244,255 ---- if (cutarg != NULL) { long lo; long hi; ! char dummy; ! if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) { cuthiyear = hi; } else if (sscanf(cutarg, "%ld,%ld%c", ! &lo, &hi, &dummy) == 2) { cutloyear = lo; cuthiyear = hi; } else { *************** *** 266,272 **** show(argv[i], t, TRUE); if (t < cutlotime) t = cutlotime; ! tmp = localtime(&t); if (tmp != NULL) { tm = *tmp; (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); --- 302,308 ---- show(argv[i], t, TRUE); if (t < cutlotime) t = cutlotime; ! tmp = my_localtime(&t); if (tmp != NULL) { tm = *tmp; (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); *************** *** 399,405 **** register struct tm * tmp; char loab[MAX_STRING_LENGTH]; ! lotmp = localtime(&lot); if (lotmp != NULL) { lotm = *lotmp; (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); --- 435,441 ---- register struct tm * tmp; char loab[MAX_STRING_LENGTH]; ! lotmp = my_localtime(&lot); if (lotmp != NULL) { lotm = *lotmp; (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); *************** *** 414,420 **** ++t; else if (t >= hit) --t; ! tmp = localtime(&t); if (tmp != NULL) tm = *tmp; if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : --- 450,456 ---- ++t; else if (t >= hit) --t; ! tmp = my_localtime(&t); if (tmp != NULL) tm = *tmp; if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : *************** *** 477,483 **** } (void) printf(" = "); } ! tmp = localtime(&t); dumptime(tmp); if (tmp != NULL) { if (*abbr(tmp) != '\0') --- 513,519 ---- } (void) printf(" = "); } ! tmp = my_localtime(&t); dumptime(tmp); if (tmp != NULL) { if (*abbr(tmp) != '\0')

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proposed tz changes for Paraguay, Israel, "backward", and commentary
by Paul Eggert Jan. 13, 2005

Jan. 13, 2005

"Olson, Arthur David (NIH/NCI)" <olsona(a)dc37a.nci.nih.gov> writes: > Paul Eggert typically handles rule changes; Paul has been swamped of late. True, but we really should get those Paraguay changes out the door, since we're currently mishandling last spring's time stamps. Here is a proposed set of patches that accumulate all the updates I've been saving up. * Changes to current or future data. - Paraguay's DST transitions have changed. (Thanks to Jesper Norgaard Welen and Steffen Thorsen for this.) - Israel's DST transitions will change. The current proposals are only tentative, but are more likely than the old tz data. (Thanks to Ephraim Silverberg for this.) * Database changes invisible to users. - The "backward" file no longer contains links to links. (Thanks to Mark Davis for finding these). * Commentary changes. - The latest ISO 8601 version is now dated 2004, not 2001. - README now no longer suggests that the tz data is not particularly useful, and warns about dates before 1970. - Add comments about Unalaska, which may have deviated from statutory time from early 1967 to 1983. (Thanks to David Flater for this.) - Add comments about Mount Washington Observatory, which observes EST all year. (Thanks to Dave Cantor for this.) - Add comments about Germany's secret WWII manned weather stations in East Greenland and Franz Josef Land. - Add links to calconnect.org, VelaTerra. - Remove link to Airlines, Airplanes, and Airports, as it no longer seems to make time zone data public. - Update many URLs to follow resources that moved. =================================================================== RCS file: RCS/README,v retrieving revision 2001.3 retrieving revision 2001.3.0.1 diff -pu -r2001.3 -r2001.3.0.1 --- README 2001/06/05 17:48:21 2001.3 +++ README 2005/01/11 22:18:14 2001.3.0.1 @@ -52,8 +52,10 @@ substituting your desired installation d To use the new functions, use a "-ltz" option when compiling or linking. -Historical local time information has been included here not because it -is particularly useful, but rather to: +Historical local time information has been included here to: + +* provide a compendium of data about the history of civil time + that is useful even if the data are not 100% accurate; * give an idea of the variety of local time rules that have existed in the past and thus an idea of the variety that may be @@ -63,7 +65,9 @@ is particularly useful, but rather to: system. The information in the time zone data files is by no means authoritative; -if you know that the rules are different from those in a file, by all means +the files currently do not even attempt to covar all time stamps before +1970, and there are undoubtedly errors even for time stamps since 1970. +If you know that the rules are different from those in a file, by all means feel free to change file (and please send the changed version to tz(a)elsie.nci.nih.gov for use in the future). Europeans take note! =================================================================== RCS file: RCS/asia,v retrieving revision 2004.5 retrieving revision 2004.5.0.1 diff -pu -r2004.5 -r2004.5.0.1 --- asia 2004/10/11 18:44:51 2004.5 +++ asia 2005/01/11 22:18:14 2004.5.0.1 @@ -639,7 +639,7 @@ Rule Zion 1988 only - Apr 9 0:00 1:00 D Rule Zion 1988 only - Sep 3 0:00 0 S # From Ephraim Silverberg <ephraim(a)cs.huji.ac.il> -# (1997-03-04, 1998-03-16, 1998-12-28, 2000-01-17 and 2000-07-25): +# (1997-03-04, 1998-03-16, 1998-12-28, 2000-01-17, 2000-07-25, and 2004-12-22): # According to the Office of the Secretary General of the Ministry of # Interior, there is NO set rule for Daylight-Savings/Standard time changes. @@ -690,13 +690,13 @@ Rule Zion 1995 only - Sep 3 0:00 0 S # time, Haim Ramon. The official announcement regarding 1996-1998 # (with the dates for 1997-1998 no longer being relevant) can be viewed at: # -# ftp://ftp.huji.ac.il/pub/tz/announcements/1996-1998.ramon.ps.gz +# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/1996-1998.ramon.ps.gz # # The dates for 1997-1998 were altered by his successor, Rabbi Eli Suissa. # # The official announcements for the years 1997-1999 can be viewed at: # -# ftp://ftp.huji.ac.il/pub/tz/announcements/YYYY.ps.gz +# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/YYYY.ps.gz # # where YYYY is the relevant year. @@ -716,12 +716,12 @@ Rule Zion 1999 only - Sep 3 2:00 0 S # # The official announcement for the start date of 2000 can be viewed at: # -# ftp://ftp.huji.ac.il/pub/tz/announcements/2000-start.ps.gz +# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2000-start.ps.gz # # The official announcement for the end date of 2000 and the dates # for the years 2001-2004 can be viewed at: # -# ftp://ftp.huji.ac.il/pub/tz/announcements/2000-2004.ps.gz +# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2000-2004.ps.gz # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Zion 2000 only - Apr 14 2:00 1:00 D @@ -735,52 +735,97 @@ Rule Zion 2003 only - Oct 3 1:00 0 S Rule Zion 2004 only - Apr 7 1:00 1:00 D Rule Zion 2004 only - Sep 22 1:00 0 S -# From Paul Eggert (2000-07-25): -# Here are guesses for rules after 2004. -# They are probably wrong, but they are more likely than no DST at all. +# Yesterday, the Knesset Interior Committee passed a proposed (originally +# in March 2004) change to the Time Setting Law that would make the dates +# for DST from 2005 and beyond so that DST starts on the night _after_ the +# first night of the Passover holiday at midnight until midnight of the +# Saturday night _before_ the fast of Yom Kippur. +# +# Those who can read Hebrew can view the proposal at: +# +# ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2005+.ps +# +# The proposal still has to be passed by the Knesset (three readings) for +# it to become law.... + +# From Paul Eggert (2004-12-22): +# For now, guess that the rules proposed on 2004-12-20 will be adopted. +# This is quite possibly wrong, but it is more likely than no DST at all. +# I used Ed Reingold's cal-hebrew in GNU Emacs 21.3, along with code +# written by Ephraim Silverberg, to generate this list. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Zion 2005 max - Apr 1 1:00 1:00 D -Rule Zion 2005 max - Oct 1 1:00 0 S +Rule Zion 2005 only - Apr 25 0:00 1:00 D +Rule Zion 2005 only - Oct 9 0:00 0 S +Rule Zion 2006 only - Apr 14 0:00 1:00 D +Rule Zion 2006 only - Oct 1 0:00 0 S +Rule Zion 2007 only - Apr 4 0:00 1:00 D +Rule Zion 2007 only - Sep 16 0:00 0 S +Rule Zion 2008 only - Apr 21 0:00 1:00 D +Rule Zion 2008 only - Oct 5 0:00 0 S +Rule Zion 2009 only - Apr 10 0:00 1:00 D +Rule Zion 2009 only - Sep 27 0:00 0 S +Rule Zion 2010 only - Mar 31 0:00 1:00 D +Rule Zion 2010 only - Sep 12 0:00 0 S +Rule Zion 2011 only - Apr 20 0:00 1:00 D +Rule Zion 2011 only - Oct 2 0:00 0 S +Rule Zion 2012 only - Apr 8 0:00 1:00 D +Rule Zion 2012 only - Sep 23 0:00 0 S +Rule Zion 2013 only - Mar 27 0:00 1:00 D +Rule Zion 2013 only - Sep 8 0:00 0 S +Rule Zion 2014 only - Apr 16 0:00 1:00 D +Rule Zion 2014 only - Sep 28 0:00 0 S +Rule Zion 2015 only - Apr 5 0:00 1:00 D +Rule Zion 2015 only - Sep 20 0:00 0 S +Rule Zion 2016 only - Apr 24 0:00 1:00 D +Rule Zion 2016 only - Oct 9 0:00 0 S +Rule Zion 2017 only - Apr 12 0:00 1:00 D +Rule Zion 2017 only - Sep 24 0:00 0 S +Rule Zion 2018 only - Apr 1 0:00 1:00 D +Rule Zion 2018 only - Sep 16 0:00 0 S +Rule Zion 2019 only - Apr 21 0:00 1:00 D +Rule Zion 2019 only - Oct 6 0:00 0 S +Rule Zion 2020 only - Apr 10 0:00 1:00 D +Rule Zion 2020 only - Sep 27 0:00 0 S +Rule Zion 2021 only - Mar 29 0:00 1:00 D +Rule Zion 2021 only - Sep 12 0:00 0 S +Rule Zion 2022 only - Apr 17 0:00 1:00 D +Rule Zion 2022 only - Oct 2 0:00 0 S +Rule Zion 2023 only - Apr 7 0:00 1:00 D +Rule Zion 2023 only - Sep 24 0:00 0 S +Rule Zion 2024 only - Apr 24 0:00 1:00 D +Rule Zion 2024 only - Oct 6 0:00 0 S +Rule Zion 2025 only - Apr 14 0:00 1:00 D +Rule Zion 2025 only - Sep 28 0:00 0 S +Rule Zion 2026 only - Apr 3 0:00 1:00 D +Rule Zion 2026 only - Sep 20 0:00 0 S +Rule Zion 2027 only - Apr 23 0:00 1:00 D +Rule Zion 2027 only - Oct 10 0:00 0 S +Rule Zion 2028 only - Apr 12 0:00 1:00 D +Rule Zion 2028 only - Sep 24 0:00 0 S +Rule Zion 2029 only - Apr 1 0:00 1:00 D +Rule Zion 2029 only - Sep 16 0:00 0 S +Rule Zion 2030 only - Apr 19 0:00 1:00 D +Rule Zion 2030 only - Oct 6 0:00 0 S +Rule Zion 2031 only - Apr 9 0:00 1:00 D +Rule Zion 2031 only - Sep 21 0:00 0 S +Rule Zion 2032 only - Mar 28 0:00 1:00 D +Rule Zion 2032 only - Sep 12 0:00 0 S +Rule Zion 2033 only - Apr 15 0:00 1:00 D +Rule Zion 2033 only - Oct 2 0:00 0 S +Rule Zion 2034 only - Apr 5 0:00 1:00 D +Rule Zion 2034 only - Sep 17 0:00 0 S +Rule Zion 2035 only - Apr 25 0:00 1:00 D +Rule Zion 2035 only - Oct 7 0:00 0 S +Rule Zion 2036 only - Apr 13 0:00 1:00 D +Rule Zion 2036 only - Sep 28 0:00 0 S +Rule Zion 2037 only - Apr 1 0:00 1:00 D +Rule Zion 2037 only - Sep 13 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Jerusalem 2:20:56 - LMT 1880 2:20:40 - JMT 1918 # Jerusalem Mean Time? 2:00 Zion I%sT -# From Ephraim Silverberg (2003-03-23): -# -# Minister of Interior Poraz has announced that he will respect the law -# passed in July 2000 (proposed at the time jointly by himself and -# then-MK David Azulai [Shas]) fixing the dates for 2000-2004. Hence, -# the dates for 2003 and 2004 remain unchanged.... -# -# As far as 2005 and beyond, no dates have been set. However, the -# minister has mentioned that he wishes to propose to move Israel's -# timezone in 2005 from GMT+2 to GMT+3 and upon that have DST during -# the summer months (i.e. GMT+4). However, no legislation in this -# direction is expected until the latter part of 2004 which is a long -# time off in terms of Israeli politics. - -# (2004-09-20): -# The latest rumour, however, is that in 2005, when the clock changes to -# Daylight Saving Time (date as yet unknown), the move will be a two-hour leap -# forward (from UTC+0200 to UTC+0400) and then, in the fall, the clock will -# move back only an hour to UTC+0300 thus effectively moving Israel's timezone -# from UTC+0200 to UTC+0300. However, no actual draft has been put before the -# Knesset (Israel's Parliament) though the intention is to do so this -# month [2004-09]. - -# (2004-09-26): -# Even though the draft law for the above did pass the Ministerial Committee -# for Legislative Matters three months ago, it was voted down in today's -# Cabinet meeting. The current suggestion is to keep the current timezone at -# UTC+0200 but have an extended period of Daylight Saving Time (UTC+0300) from -# the beginning of Passover holiday in the spring to after the Tabernacle -# holiday in the fall (i.e. the dates of which are governed by the Hebrew -# calendar but this means at least 184 days of DST). However, this is only a -# suggestion that was raised in today's cabinet meeting and has not yet been -# drafted. - ############################################################################### =================================================================== RCS file: RCS/backward,v retrieving revision 2004.2 retrieving revision 2004.2.0.1 diff -pu -r2004.2 -r2004.2.0.1 --- backward 2004/07/19 18:32:48 2004.2 +++ backward 2005/01/11 22:18:14 2004.2.0.1 @@ -13,7 +13,7 @@ Link America/Argentina/Jujuy America/Juj Link America/Indiana/Knox America/Knox_IN Link America/Argentina/Mendoza America/Mendoza Link America/Rio_Branco America/Porto_Acre -Link America/Cordoba America/Rosario +Link America/Argentina/Cordoba America/Rosario Link America/St_Thomas America/Virgin Link Asia/Ashgabat Asia/Ashkhabad Link Asia/Chongqing Asia/Chungking @@ -34,7 +34,7 @@ Link Australia/Hobart Australia/Tasmania Link Australia/Melbourne Australia/Victoria Link Australia/Perth Australia/West Link Australia/Broken_Hill Australia/Yancowinna -Link America/Porto_Acre Brazil/Acre +Link America/Rio_Branco Brazil/Acre Link America/Noronha Brazil/DeNoronha Link America/Sao_Paulo Brazil/East Link America/Manaus Brazil/West @@ -55,10 +55,10 @@ Link Europe/Dublin Eire Link Europe/Chisinau Europe/Tiraspol Link Europe/London GB Link Europe/London GB-Eire -Link Etc/GMT+0 GMT+0 -Link Etc/GMT-0 GMT-0 -Link Etc/GMT0 GMT0 -Link Etc/Greenwich Greenwich +Link Etc/GMT GMT+0 +Link Etc/GMT GMT-0 +Link Etc/GMT GMT0 +Link Etc/GMT Greenwich Link Asia/Hong_Kong Hongkong Link Atlantic/Reykjavik Iceland Link Asia/Tehran Iran @@ -70,7 +70,7 @@ Link Africa/Tripoli Libya Link America/Tijuana Mexico/BajaNorte Link America/Mazatlan Mexico/BajaSur Link America/Mexico_City Mexico/General -Link America/Shiprock Navajo +Link America/Denver Navajo Link Pacific/Auckland NZ Link Pacific/Chatham NZ-CHAT Link Pacific/Pago_Pago Pacific/Samoa @@ -95,6 +95,6 @@ Link America/Denver US/Mountain Link America/Los_Angeles US/Pacific Link Pacific/Pago_Pago US/Samoa Link Etc/UTC UTC -Link Etc/Universal Universal +Link Etc/UTC Universal Link Europe/Moscow W-SU -Link Etc/Zulu Zulu +Link Etc/UTC Zulu =================================================================== RCS file: RCS/europe,v retrieving revision 2004.7 retrieving revision 2004.7.0.1 diff -pu -r2004.7 -r2004.7.0.1 --- europe 2004/11/02 14:05:33 2004.7 +++ europe 2005/01/11 22:18:14 2004.7.0.1 @@ -754,6 +754,11 @@ Zone Atlantic/Faeroe -0:27:04 - LMT 1908 0:00 - WET 1981 0:00 EU WE%sT # +# From Paul Eggert (2004-10-31): +# During World War II, Germany maintained secret manned weather stations in +# East Greenland and Franz Josef Land, but we don't know their time zones. +# My source for this is Wilhelm Dege's book mentioned under Svalbard. +# # From Paul Eggert (1996-11-22): # Greenland joined the EU as part of Denmark, obtained home rule on 1979-05-01, # and left the EU on 1985-02-01. It therefore should have been using EU @@ -1633,7 +1638,7 @@ Zone Europe/Oslo 0:43:00 - LMT 1895 Jan # <http://www.svalbard.com/SvalbardFAQ.html> says that the Germans were # expelled on 1942-05-14. However, small parties of Germans did return, # and according to Wilhelm Dege's book "War North of 80" (1954) -# <http://www.utpress.utoronto.ca/publishing/rights/dege_warnorthof80.htm> +# <http://www.ucalgary.ca/UofC/departments/UP/1-55238/1-55238-110-2.html> # the German armed forces at the Svalbard weather station code-named # Haudegen did not surrender to the Allies until September 1945. # =================================================================== RCS file: RCS/northamerica,v retrieving revision 2004.7 retrieving revision 2004.7.0.1 diff -pu -r2004.7 -r2004.7.0.1 --- northamerica 2004/11/02 14:05:32 2004.7 +++ northamerica 2005/01/11 22:18:14 2004.7.0.1 @@ -208,6 +208,13 @@ Rule US 1987 max - Apr Sun>=1 2:00 1:00 # Pennsylvania, Rhode Island, South Carolina, eastern Tennessee, # Vermont, Virginia, West Virginia +# From Dave Cantor (2004-11-02): +# Early this summer I had the occasion to visit the Mount Washington +# Observatory weather station atop (of course!) Mount Washington [, NH].... +# One of the staff members said that the station was on Eastern Standard Time +# and didn't change their clocks for Daylight Saving ... so that their +# reports will always have times which are 5 hours behind UTC. + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule NYC 1920 only - Mar lastSun 2:00 1:00 D Rule NYC 1920 only - Oct lastSun 2:00 0 S @@ -355,10 +362,26 @@ Zone America/Adak 12:13:21 - LMT 1867 O -11:00 US B%sT 1983 Oct 30 2:00 -10:00 US AH%sT 1983 Nov 30 -10:00 US HA%sT +# The following switches don't quite make our 1970 cutoff. +# # Shanks writes that part of southwest Alaska (e.g. Aniak) # switched from -11:00 to -10:00 on 1968-09-22 at 02:00, # and another part (e.g. Akiak) made the same switch five weeks later. -# These switches don't quite make our 1970 cutoff. +# +# From David Flater (2004-11-09): +# In e-mail, 2004-11-02, Ray Hudson, historian/liaison to the Unalaska +# Historic Preservation Commission, provided this information, which +# suggests that Unalaska deviated from statutory time from early 1967 +# possibly until 1983: +# +# Minutes of the Unalaska City Council Meeting, January 10, 1967: +# "Except for St. Paul and Akutan, Unalaska is the only important +# location not on Alaska Standard Time. The following resolution was +# made by William Robinson and seconded by Henry Swanson: Be it +# resolved that the City of Unalaska hereby goes to Alaska Standard +# Time as of midnight Friday, January 13, 1967 (1 A.M. Saturday, +# January 14, Alaska Standard Time.) This resolution was passed with +# three votes for and one against." # Hawaii # =================================================================== RCS file: RCS/southamerica,v retrieving revision 2004.7 retrieving revision 2004.7.0.1 diff -pu -r2004.7 -r2004.7.0.1 --- southamerica 2004/11/02 14:05:32 2004.7 +++ southamerica 2005/01/11 22:18:14 2004.7.0.1 @@ -942,9 +942,16 @@ Rule Para 1998 2001 - Mar Sun>=1 0:00 0 # A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the # dst method to be from the first Sunday in September to the first Sunday in # April. -Rule Para 2002 max - Apr Sun>=1 0:00 0 - -Rule Para 2002 max - Sep Sun>=1 0:00 1:00 S - +Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - +Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S +# +# From Jesper Norgaard Welen (2005-01-02): +# There are several sources that claim that Paraguay made +# a timezone rule change in autumn 2004. +# From Steffen Thorsen (2005-01-05): +# Decree 1,867 (2004-03-05) <http://www.labor.com.py/noticias.asp?id=27> +Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S +Rule Para 2005 max - Mar Sun>=15 0:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Asuncion -3:50:40 - LMT 1890 =================================================================== RCS file: RCS/tz-link.htm,v retrieving revision 2004.5 retrieving revision 2004.5.0.2 diff -pu -r2004.5 -r2004.5.0.2 --- tz-link.htm 2004/10/11 18:44:53 2004.5 +++ tz-link.htm 2005/01/11 22:22:42 2004.5.0.2 @@ -9,7 +9,7 @@ <meta http-equiv="Content-type" content='text/html; charset="US-ASCII"' /> <meta name="DC.Creator" content="Eggert, Paul" /> <meta name="DC.Contributor" content="Olson, Arthur David" /> -<meta name="DC.Date" content="2004-09-22" /> +<meta name="DC.Date" content="2005-01-11" /> <meta name="DC.Description" content="Sources of information about time zones and daylight saving time" /> <meta name="DC.Identifier" content="http://www.twinsun.com/tz/tz-link.htm" /> @@ -136,7 +136,9 @@ title="Internet Engineering Task Force"> Calendaring and Scheduling Working Group (<abbr title="Calendaring and Scheduling Working Group">calsch</abbr>)</a> covers time zone -data; see its VTIMEZONE calendar component.</li> +data; see its VTIMEZONE calendar component. +The <a href='http://www.calconnect.org/'>Calendaring and Scheduling +Consortium</a> is promoting further work in this area.</li> <li>The <a href="http://lists.w3.org/Archives/Public/www-rdf-calendar/">www-rdf-calendar</a> list discusses <a @@ -157,7 +159,7 @@ definition that corresponded to iCalenda </ul> <h2>Other <code>tz</code> compilers</h2> <ul> -<li><a href="http://www.dachaplin.dsl.pipex.com/vzic">Vzic iCalendar +<li><a href="http://dialspace.dial.pipex.com/prod/dialspace/town/pipexdsl/s/asbm26/vzic/">Vzic iCalendar Timezone Converter</a> describes a program Vzic that compiles <code>tz</code> source into iCalendar-compatible VTIMEZONE files. Vzic is freely @@ -222,6 +224,9 @@ Java-specific format.</li> href="http://www1.tip.nl/~t876506/AboutTimeZonesHC.html">HyperCard time zones calculator</a> is a HyperCard stack.</li> <li><a +href="http://www.veladesigngroup.com/velaterra.html">VelaTerra</a> is +a Mac OS X program.</li> +<li><a href="http://www.cimmyt.org/timezone/">World Time Explorer</a> is a Microsoft Windows program.</li> </ul> @@ -243,10 +248,7 @@ is another time zone database.</li> contains data from the Time Service Department of the <abbr>US</abbr> Naval Observatory, used as the source for the <code>usno*</code> files in the <code>tz</code> distribution.</li> -<li><a href="http://www.airportcitycodes.com/aaa/">Airlines, Airplanes -and Airports</a> lists current standard times for thousands of -airports around the world. This seems to be derived from -the <a href="http://www.iata.org/ps/publications/9179.htm">Standard +<li>The <a href="http://www.iata.org/ps/publications/9179.htm">Standard Schedules Information Manual</a> of the the <a href="http://www.iata.org/">International Air Transport Association</a>, @@ -299,7 +301,8 @@ Time Zones and Time Zone Data</a>.</li> </ul> <h2>Civil time concepts and history</h2> <ul> -<li><a href="http://physics.nist.gov/time">A Walk through Time</a> +<li><a href="http://physics.nist.gov/GenInt/Time/time.html">A +Walk through Time</a> surveys the evolution of timekeeping.</li> <li><a href="http://webexhibits.org/daylightsaving/">About Daylight Saving Time - History, rationale, laws & dates</a> @@ -447,7 +450,7 @@ title="Global Positioning System">GPS</a (1999-11), 50–57 and discussed further in R. A. Nelson et al., <a href="http://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf">The leap second: its history and possible future</a>, -<a href="http://www.bipm.fr/metrologia/metrologia.html">Metrologia</a> +<a href="http://www.bipm.fr/metrologia/">Metrologia</a> <strong>38</strong> (2001), 509–529. <a href="http://www.ucolick.org/~sla/leapsecs/onlinebib.html">The Future of Leap Seconds</a> catalogs information about this @@ -459,12 +462,11 @@ contentious issue.</li> <a href="http://www.cl.cam.ac.uk/~mgk25/iso-time.html">A Summary of the International Standard Date and Time Notation</a> is a good summary of -<abbr title="International Organization for Standardization">ISO</abbr> -8601:1988 - Data elements and interchange formats - Information interchange -- Representation of dates and times (which has been superseded by <a -href="http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=26780"><abbr>ISO</abbr> -8601:2000</a>).</li> +href="http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=40874"><abbr +title="International Organization for Standardization">ISO</abbr> +8601:2004 -- Data elements and interchange formats -- Information +interchange -- Representation of dates and times</a>.</li> <li> Section 3.3 of <a href="ftp://ftp.rfc-editor.org/in-notes/rfc2822.txt">Internet @@ -482,7 +484,7 @@ protocols.</li> Best of Dates, the Worst of Dates</a> covers many problems encountered by software developers when handling dates and time stamps.</li> <li><a -href="http://oss.software.ibm.com/cvs/icu/~checkout~/icuhtml/design/formatting/ti…">Time +href="http://oss.software.ibm.com/cvs/icu/~checkout~/locale/docs/design/formattin…">Time Zone Localization</a> is a proposed mechanism for localizing time zone labels and abbreviations; for example, one might use it to specify Russian translations for "Eastern European Summer Time",

3 3

Mktime on systems with exotic time_t types
by Olson, Arthur David (NIH/NCI) Jan. 11, 2005

Jan. 11, 2005

Below find proposed changes to localtime.c to get mktime working correctly on systems with exotic time_t types (such as unsigned or double). Also included are changes to zdump.c and Makefile to arrange things that doing a... make typecheck ...exercises mktime for a good range of values. --ado ------- localtime.c ------- *** /tmp/geta3175 Tue Jan 11 11:57:49 2005 --- /tmp/getb3175 Tue Jan 11 11:57:49 2005 *************** *** 1,9 **** /* - ** XXX--have mktime et al. do the right thing when time_t is exotic - ** (for example, double). - */ - - /* ** This file is in the public domain, so clarified as of ** 1996-06-05 by Arthur David Olson (arthur_david_olson(a)nih.gov) */ --- 1,4 ---- *************** *** 10,16 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.86"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 5,11 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.87"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 1445,1450 **** --- 1440,1447 ---- register int i, j; register int saved_seconds; register long li; + register time_t lo; + register time_t hi; long y; time_t newt; time_t t; *************** *** 1518,1545 **** yourtm.tm_sec = 0; } /* ! ** Divide the search space in half ! ** (this works whether time_t is signed or unsigned). */ ! bits = TYPE_BIT(time_t) - 1; ! /* ! ** If time_t is signed, then 0 is just above the median, ! ** assuming two's complement arithmetic. ! ** If time_t is unsigned, then (1 << bits) is just above the median. ! */ ! t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits); for ( ; ; ) { ! if ((*funcp)(&t, offset, &mytm) == NULL) ! return WRONG; /* XXX probably wrong */ ! dir = tmcomp(&mytm, &yourtm); if (dir != 0) { ! if (bits-- < 0) return WRONG; ! if (bits < 0) ! --t; /* may be needed if new t is minimal */ ! else if (dir > 0) ! t -= ((long) 1) << bits; ! else t += ((long) 1) << bits; continue; } if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) --- 1515,1565 ---- yourtm.tm_sec = 0; } /* ! ** Do a binary search (this works whatever time_t's type is). */ ! if (!TYPE_SIGNED(time_t)) { ! lo = 0; ! hi = lo - 1; ! } else if (!TYPE_INTEGRAL(time_t)) { ! if (sizeof(time_t) > sizeof(float)) ! hi = (time_t) FLT_MAX; ! else hi = (time_t) DBL_MAX; ! lo = -hi; ! } else { ! register int i; ! ! lo = 1; ! for (i = 0; i < TYPE_BIT(time_t) - 1; ++i) ! lo *= 2; ! hi = -(lo + 1); ! } for ( ; ; ) { ! t = lo / 2 + hi / 2; ! if (t < lo) ! t = lo; ! else if (t > hi) ! t = hi; ! if ((*funcp)(&t, offset, &mytm) == NULL) { ! /* ! ** Assume that t is too extreme to be represented in ! ** a struct tm; arrange things so that it is less ! ** extreme on the next pass. ! */ ! dir = (t > 0) ? 1 : -1; ! } else dir = tmcomp(&mytm, &yourtm); if (dir != 0) { ! if (t == lo) { ! ++t; ! ++lo; ! } else if (t == hi) { ! --t; ! --hi; ! } ! if (lo > hi) return WRONG; ! if (dir > 0) ! hi = t; ! else lo = t; continue; } if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) *************** *** 1569,1575 **** newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; if ((*funcp)(&newt, offset, &mytm) == NULL) ! return WRONG; /* XXX probably wrong */ if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) --- 1589,1595 ---- newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; if ((*funcp)(&newt, offset, &mytm) == NULL) ! continue; if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) ------- zdump.c ------- *** /tmp/geta3196 Tue Jan 11 11:57:58 2005 --- /tmp/getb3196 Tue Jan 11 11:57:58 2005 *************** *** 1,4 **** ! static char elsieid[] = "@(#)zdump.c 7.59"; /* ** This code has been made independent of the rest of the time --- 1,4 ---- ! static char elsieid[] = "@(#)zdump.c 7.60"; /* ** This code has been made independent of the rest of the time *************** *** 154,159 **** --- 154,195 ---- static const char * tformat P((void)); static time_t yeartot P((long y)); + #ifndef TYPECHECK + #define my_localtime localtime + #else /* !defined TYPECHECK */ + static struct tm * + my_localtime(tp) + time_t * tp; + { + register struct tm * tmp; + + tmp = localtime(tp); + if (tp != NULL && tmp != NULL) { + struct tm tm; + register time_t t; + + tm = *tmp; + t = mktime(&tm); + if (t - *tp >= 1 || *tp - t >= 1) { + (void) fflush(stdout); + (void) fprintf(stderr, "\n%s: ", progname); + (void) fprintf(stderr, tformat(), *tp); + (void) fprintf(stderr, " ->"); + (void) fprintf(stderr, " sec %d", tmp->tm_sec); + (void) fprintf(stderr, " min %d", tmp->tm_min); + (void) fprintf(stderr, " hour %d", tmp->tm_hour); + (void) fprintf(stderr, " mday %d", tmp->tm_mday); + (void) fprintf(stderr, " mon %d", tmp->tm_mon); + (void) fprintf(stderr, " year %d", tmp->tm_year); + (void) fprintf(stderr, " -> "); + (void) fprintf(stderr, tformat(), t); + (void) fprintf(stderr, "\n"); + } + } + return tmp; + } + #endif /* !defined TYPECHECK */ + int main(argc, argv) int argc; *************** *** 266,272 **** show(argv[i], t, TRUE); if (t < cutlotime) t = cutlotime; ! tmp = localtime(&t); if (tmp != NULL) { tm = *tmp; (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); --- 302,308 ---- show(argv[i], t, TRUE); if (t < cutlotime) t = cutlotime; ! tmp = my_localtime(&t); if (tmp != NULL) { tm = *tmp; (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); *************** *** 399,405 **** register struct tm * tmp; char loab[MAX_STRING_LENGTH]; ! lotmp = localtime(&lot); if (lotmp != NULL) { lotm = *lotmp; (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); --- 435,441 ---- register struct tm * tmp; char loab[MAX_STRING_LENGTH]; ! lotmp = my_localtime(&lot); if (lotmp != NULL) { lotm = *lotmp; (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); *************** *** 414,420 **** ++t; else if (t >= hit) --t; ! tmp = localtime(&t); if (tmp != NULL) tm = *tmp; if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : --- 450,456 ---- ++t; else if (t >= hit) --t; ! tmp = my_localtime(&t); if (tmp != NULL) tm = *tmp; if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : *************** *** 477,483 **** } (void) printf(" = "); } ! tmp = localtime(&t); dumptime(tmp); if (tmp != NULL) { if (*abbr(tmp) != '\0') --- 513,519 ---- } (void) printf(" = "); } ! tmp = my_localtime(&t); dumptime(tmp); if (tmp != NULL) { if (*abbr(tmp) != '\0') ------- Makefile ------- *** /tmp/geta3221 Tue Jan 11 11:58:07 2005 --- /tmp/getb3221 Tue Jan 11 11:58:07 2005 *************** *** 1,4 **** ! # @(#)Makefile 7.102 # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). --- 1,4 ---- ! # @(#)Makefile 7.103 # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). *************** *** 396,404 **** typecheck: make clean ! for i in "long long" double unsigned; \ do \ ! make CFLAGS="-D_TIME_T \"-Dtime_t=$$i\"" ; \ ./zdump -v US/Eastern ; \ make clean ; \ done --- 396,404 ---- typecheck: make clean ! for i in "long long" unsigned double; \ do \ ! make CFLAGS="-DTYPECHECK -D_TIME_T \"-Dtime_t=$$i\"" ; \ ./zdump -v US/Eastern ; \ make clean ; \ done

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Tzcode2005b.tar.gz and tzdata2005b.tar.gz
by Olson, Arthur David (NIH/NCI) Jan. 10, 2005

Jan. 10, 2005

The files... ftp://elsie.nci.nih.gov/pub/tzcode2005b.tar.gz ...and... ftp://elsie.nci.nih.gov/pub/tzdata2005b.tar.gz ...are now available; these reflect the changes circulated on the time zone mailing list last week to get localtime and gmtime working on systems with exotic time_t types and to update the leap second commentary in the "leapseconds" file. --ado

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question about asia/baku 1992
by Klaus Schmid Jan. 9, 2005

Jan. 9, 2005

Dear List, I have a question about the following data lines # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule RussiaAsia 1992 only - Mar lastSat 23:00 1:00 S Rule RussiaAsia 1992 only - Sep lastSat 23:00 0 - # i.e. Sep 26 Rule RussiaAsia 1993 max - Mar lastSun 2:00s 1:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Baku 3:00 1:00 BAKST 1991 Aug 30 # independence 3:00 RussiaAsia AZ%sT 1992 Sep lastSun 2:00s # i.e. Sep 27 4:00 - AZT 1996 # Azerbaijan time Now if I try to interprete these lines I get: from 1992 Mar to 1992 Sep 26 23:00 (local): GMTOFF= 3:00 and SAVE= 1:00 i.e. LOCALOFF= +4:00 ==> 1992 Sep 26 23:00 (local) == 1992 Sep 26 19:00 zulu from 1992 Sep 26 19:00 zulu to 1992 Sep 26 23:00 zulu: GMTOFF= LOCALOFF= +3:00 from 1992 Sep 26 23:00 zulu to 1996: GMTOFF= LOCALOFF= +4:00 This would mean a local offset change ocurred for only four hours. Is this correct? Best Regards, Klaus Schmid

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Paraguay timezone rules
by Jesper Norgaard Welen Jan. 5, 2005

Jan. 5, 2005

There are several sources that claim that Paraguay made a timezone rule change in autumn 2004, which not only changed the date that Paraguay entered DST in 2004 but will also affect DST dates in 2005. Steffen Thorsen on http://www.timeanddate.com claimed that Paraguay entered DST in autumn 2004 Sunday the 17.th. of October and not Sunday 5.th. of September as would have been predicted by the TZ database. Now in 2005 it claims that Paraguay will enter DST Sunday the 16.th. of October 2005 and not Sunday 4.th. of September as it would be according to the TZ database. I tried to verify this with some internet searches, but could only find one source that interestingly is updating the TZ rules in a local version. The source is http://avi.alkalay.net/linux/zoneinfo/Paraguay.txt and it claims the following rule for Paraguay: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Paraguay 2002 2003 - Apr Sun<=7 0:00 0 S Rule Paraguay 2002 2003 - Sep Sun<=7 0:00 1 D Rule Paraguay 2004 only - Apr Sun<=7 0:00 0 S Rule Paraguay 2004 max - Oct Sun>=15 0:00 1 D Rule Paraguay 2005 max - Mar Sun>=8 0:00 0 S The rule for "2004 to max" about when Paraguay enters DST, is consistent with Steffen Thorsens dates for 2004 and 2005. However, it also claims that Paraguay leaves DST at different dates now in 2005, at Second Sunday of March instead of First Sunday of April. If this is true, even Steffen will have to change his database. I wonder if any of the members of the TZ mailing list can confirm these facts. A quote from the exact text of the timezone decrees corresponding would be the best, of course. Regards, Jesper Nørgaard Welen 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 (5) 58-04-20-04 ext. 1374 Fax: +52 (5) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the free program World Time Explorer, I made: http://www.cimmyt.org/timezone/index.htm

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Question on id stability
by Mark Davis Jan. 4, 2005

Jan. 4, 2005

I have a couple of questions that I hope someone can give guidance on. These are sparked by the change from IDs like "America/Catamarca" to "America/Argentina/Catamarca" In CLDR (http://unicode.org/cldr/) we are using the IDs to access different localized names for the time zones. Each time a zone ID changes, we have the choice of either updating all the localized files that use that ID, or leaving them be and using the old ID. To make our maintenance easier (and make it easier for implementations), I'm inclined to recommend that we maintain stability as of a given date; that we never change an ID after that point. 1. Would there be any downside to such a policy? 2. I was not able to find documentation as to whether there is a policy disallowing 'retired' IDs to be reused later for a different timezone. Some might think that it is so obviously a bad policy to reuse IDs that it doesn't need stating, but ISO has reused country codes, for example, causing no end of problems for stability. 3. What was the reason for the change for Argentina? Is this a one-off aberration, or can we expect America/Chicago to change to America/United States/Chicago, America/Vancouver to change to America/Canada/Vancouver, and so on down the line? 4. Are links expected to be definitional and stable? That is, if I ever have two IDs that are related by a link: Link A B Can it ever be the case in the future that the IDs A and B are "unlinked", and given different rules? Or is it that links in certain files are stable? 5. A side note: when examining the links, and assuming that they are of the form Link <new> <old> there are a small number of links that are "not final", meaning that what they link to, itself links to something else. While not formally an issue, it might be more convenient (and transparent) if these were put in a 'canonical' form. 13 America/Rosario => America/Cordoba # NOT FINAL => America/Argentina/Cordoba 39 Brazil/Acre => America/Porto_Acre # NOT FINAL => America/Rio_Branco 79 GMT+0 => Etc/GMT+0 # NOT FINAL => Etc/GMT 80 GMT-0 => Etc/GMT-0 # NOT FINAL => Etc/GMT 81 GMT0 => Etc/GMT0 # NOT FINAL => Etc/GMT 82 Greenwich => Etc/Greenwich # NOT FINAL => Etc/GMT 99 Navajo => America/Shiprock # NOT FINAL => America/Denver 137 Universal => Etc/Universal # NOT FINAL => Etc/UTC 139 Zulu => Etc/Zulu # NOT FINAL => Etc/UTC ‎Mark

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ISO-8601 3.25 Second, Leap Applications requiring leap seconds
by HJWOUDENBERG＠aol.com Jan. 4, 2005

Jan. 4, 2005

Applications * astrometry * geophysics * orbitography * positionning IREP _http://hpiers.obspm.fr/eop-pc/_ (http://hpiers.obspm.fr/eop-pc/) Has anyone used them in a commercial application? I think I have an efficent method to include leap seconds however, but don't plan to program it until I know there is a need.. Anyone have ideas on how to notfiy the software to include or exclude leap seconds? Solution for including leaps seconds: Convert the year to binary value. If the months are the first quarter of the year mutiply by 4. If the months are the second quarter of the year Multiply by 4 and add 1. If the third quarter Multiply by 4 and add 2 If the fourth quarter Multiply by 4 and add 3 Us the binary result as an index into a table. Each postion of the table contains the cumulative binary leap seconds. Add the cumulative leap seconds to the seconds in the date. For every year the table will have four entrys per year. for 03-31, 06:30, 09-30 12-31 One bytes allows 256 cumulative seconds.

1 0

leapseconds
by Olson, Arthur David (NIH/NCI) Jan. 3, 2005

Jan. 3, 2005

Here's a (commentary-only) update to the leapseconds file to reflect the IERS bulletin issued last year. --ado ------- leapseconds ------- *** /tmp/geta28966 Mon Jan 3 11:58:36 2005 --- /tmp/getb28966 Mon Jan 3 11:58:36 2005 *************** *** 1,4 **** ! # @(#)leapseconds 7.17 # Allowance for leapseconds added to each timezone file. --- 1,4 ---- ! # @(#)leapseconds 7.18 # Allowance for leapseconds added to each timezone file. *************** *** 45,51 **** Leap 1998 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 --- 45,50 ---- *************** *** 55,64 **** # FAX : 33 (0) 1 40 51 22 91 # Internet : services.iers(a)obspm.fr # ! # Paris, 15 January 2004 # - # Bulletin C 27 # # To authorities responsible # for the measurement and # distribution of time --- 54,64 ---- # FAX : 33 (0) 1 40 51 22 91 # Internet : services.iers(a)obspm.fr # ! # Paris, 21 July 2004 # # + # Bulletin C 28 + # # To authorities responsible # for the measurement and # distribution of time *************** *** 65,71 **** # # INFORMATION ON UTC - TAI # ! # NO positive leap second will be introduced at the end of June 2004. # The difference between UTC and the International Atomic Time TAI is: # # from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s --- 65,71 ---- # # INFORMATION ON UTC - TAI # ! # NO positive leap second will be introduced at the end of December 2004. # The difference between UTC and the International Atomic Time TAI is: # # from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s *************** *** 78,81 **** # Daniel GAMBIS # Director # Earth Orientation Center of IERS - # Observatoire de Paris, France --- 78,80 ----

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Second part of localtime.c changes
by Olson, Arthur David (NIH/NCI) Jan. 1, 2005

Jan. 1, 2005

Having dispensed with the easy stuff last week, below find the hard stuff. The goal is to better behavior of localtime and gmtime on systems where time_t is an exotic type--for example, a 64-bit integer or a double. A problem is that the tm_year field of a "struct tm" field is, by standard, an int--so there are some (very positive or very negative) time_t values that can't be broken down into a "struct tm". I've adopted existing practice here--localtime and gmtime return NULL in such cases. The system I'm using is a Sunblade 100 running gcc version 3.2.3. If I do a "make typecheck" using version 7.85 of localtime.c and then do a "make typecheck" using version 7.86, I get these differences: 29,30c29,30 < US/Eastern Sat Oct 16 08:29:52 -1583348 UTC = Sat Oct 16 03:29:52 -1583348 EST isdst=0 < US/Eastern Sun Oct 17 08:29:52 -1583348 UTC = Sun Oct 17 03:29:52 -1583348 EST isdst=0 --- > US/Eastern -9223372036854775808 = NULL > US/Eastern -9223372036854689408 = NULL 501,502c501,502 < US/Eastern Sun Mar 16 15:30:07 1587287 UTC = Sun Mar 16 10:30:07 1587287 EST isdst=0 < US/Eastern Mon Mar 17 15:30:07 1587287 UTC = Mon Mar 17 10:30:07 1587287 EST isdst=0 --- > US/Eastern 9223372036854689407 = NULL > US/Eastern 9223372036854775807 = NULL 524,525c524,525 < US/Eastern Sun Jun 23 20:45:52 5881512 UTC = Sat Jul 10 22:14:08 -5877573 EST isdst=0 < US/Eastern Sun Jun 23 20:45:52 5881512 UTC = Sat Jul 10 22:14:08 -5877573 EST isdst=0 --- > US/Eastern -1.79769e+308 = NULL > US/Eastern -1.79769e+308 = NULL 996,997c996,997 < US/Eastern Sat Jul 10 03:14:07 -5877573 UTC = Fri Jul 9 22:14:07 -5877573 EST isdst=0 < US/Eastern Sat Jul 10 03:14:07 -5877573 UTC = Fri Jul 9 22:14:07 -5877573 EST isdst=0 --- > US/Eastern 1.79769e+308 = NULL > US/Eastern 1.79769e+308 = NULL So...for this regression test at least, the only differences are the ones I'd expect. I'm eager for feedback. --ado ------- localtime.c ------- *** /tmp/geta22155 Sat Jan 1 13:17:31 2005 --- /tmp/getb22155 Sat Jan 1 13:17:31 2005 *************** *** 1,8 **** /* ! ** XXX--do the right thing if time_t is double and ! ** the value fed to gmtime or localtime is very very negative or ! ** very very positive (which causes problems with the days-and-rem logic). ! ** Also: do the right thing in mktime if time_t is double. */ /* --- 1,6 ---- /* ! ** XXX--have mktime et al. do the right thing when time_t is exotic ! ** (for example, double). */ /* *************** *** 12,18 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.85"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 10,16 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.86"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 141,146 **** --- 139,145 ---- static struct tm * localsub P((const time_t * timep, long offset, struct tm * tmp)); static int increment_overflow P((int * number, int delta)); + static int leaps_thru_end_of P((int y)); static int long_increment_overflow P((long * number, int delta)); static int long_normalize_overflow P((long * tensptr, int * unitsptr, int base)); *************** *** 1174,1179 **** --- 1173,1191 ---- #endif /* defined STD_INSPIRED */ + /* + ** Return the number of leap years through the end of the given year + ** where, to make the math easy, the answer for year zero is defined as zero. + */ + + static int + leaps_thru_end_of(y) + register const int y; + { + return (y >= 0) ? (y / 4 - y / 100 + y / 400) : + -(leaps_thru_end_of(-(y + 1)) + 1); + } + static struct tm * timesub(timep, offset, sp, tmp) const time_t * const timep; *************** *** 1182,1191 **** register struct tm * const tmp; { register const struct lsinfo * lp; ! register long days; register long rem; ! register long y; ! register int yleap; register const int * ip; register long corr; register int hit; --- 1194,1203 ---- register struct tm * const tmp; { register const struct lsinfo * lp; ! register time_t tdays; ! register int idays; /* unsigned would be so 2003 */ register long rem; ! int y; register const int * ip; register long corr; register int hit; *************** *** 1219,1246 **** break; } } ! days = *timep / SECSPERDAY; ! rem = *timep - ((time_t) days) * SECSPERDAY; ! #ifdef mc68k ! if (*timep == 0x80000000) { ! /* ! ** A 3B1 muffs the division on the most negative number. ! */ ! days = -24855; ! rem = -11648; } ! #endif /* defined mc68k */ ! rem += (offset - corr); while (rem < 0) { rem += SECSPERDAY; ! --days; } while (rem >= SECSPERDAY) { rem -= SECSPERDAY; ! ++days; } tmp->tm_hour = (int) (rem / SECSPERHOUR); ! rem = rem % SECSPERHOUR; tmp->tm_min = (int) (rem / SECSPERMIN); /* ** A positive leap second requires a special --- 1231,1308 ---- break; } } ! y = EPOCH_YEAR; ! tdays = *timep / SECSPERDAY; ! rem = *timep - tdays * SECSPERDAY; ! while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { ! int newy; ! register time_t tdelta; ! register int idelta; ! register int leapdays; ! ! tdelta = tdays / DAYSPERLYEAR; ! idelta = tdelta; ! if (tdelta - idelta >= 1 || idelta - tdelta >= 1) ! return NULL; ! if (idelta == 0) ! idelta = (tdays < 0) ? -1 : 1; ! newy = y; ! if (increment_overflow(&newy, idelta)) ! return NULL; ! leapdays = leaps_thru_end_of(newy - 1) - ! leaps_thru_end_of(y - 1); ! tdays -= ((time_t) newy - y) * DAYSPERNYEAR; ! tdays -= leapdays; ! y = newy; } ! { ! register long seconds; ! ! seconds = tdays * SECSPERDAY + 0.5; ! tdays = seconds / SECSPERDAY; ! rem += seconds - tdays * SECSPERDAY; ! } ! /* ! ** Given the range, we can now fearlessly cast... ! */ ! idays = tdays; ! rem += offset - corr; while (rem < 0) { rem += SECSPERDAY; ! --idays; } while (rem >= SECSPERDAY) { rem -= SECSPERDAY; ! ++idays; } + while (idays < 0) { + if (increment_overflow(&y, -1)) + return NULL; + idays += year_lengths[isleap(y)]; + } + while (idays >= year_lengths[isleap(y)]) { + idays -= year_lengths[isleap(y)]; + if (increment_overflow(&y, 1)) + return NULL; + } + tmp->tm_year = y; + if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) + return NULL; + tmp->tm_yday = idays; + /* + ** The "extra" mods below avoid overflow problems. + */ + tmp->tm_wday = EPOCH_WDAY + + ((y - EPOCH_YEAR) % DAYSPERWEEK) * + (DAYSPERNYEAR % DAYSPERWEEK) + + leaps_thru_end_of(y - 1) - + leaps_thru_end_of(EPOCH_YEAR - 1) + + idays; + tmp->tm_wday %= DAYSPERWEEK; + if (tmp->tm_wday < 0) + tmp->tm_wday += DAYSPERWEEK; tmp->tm_hour = (int) (rem / SECSPERHOUR); ! rem %= SECSPERHOUR; tmp->tm_min = (int) (rem / SECSPERMIN); /* ** A positive leap second requires a special *************** *** 1247,1275 **** ** representation. This uses "... ??:59:60" et seq. */ tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; ! tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); ! if (tmp->tm_wday < 0) ! tmp->tm_wday += DAYSPERWEEK; ! y = EPOCH_YEAR; ! #define IPQ(i, p) ((i) / (p) - (((i) % (p)) < 0)) ! #define LEAPS_THRU_END_OF(y) (IPQ((y), 4) - IPQ((y), 100) + IPQ((y), 400)) ! while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) { ! register long newy; ! ! newy = y + days / DAYSPERNYEAR; ! if (days < 0) ! --newy; ! days -= (newy - y) * DAYSPERNYEAR + ! LEAPS_THRU_END_OF(newy - 1) - ! LEAPS_THRU_END_OF(y - 1); ! y = newy; ! } ! tmp->tm_year = y - TM_YEAR_BASE; ! tmp->tm_yday = (int) days; ! ip = mon_lengths[yleap]; ! for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) ! days = days - (long) ip[tmp->tm_mon]; ! tmp->tm_mday = (int) (days + 1); tmp->tm_isdst = 0; #ifdef TM_GMTOFF tmp->TM_GMTOFF = offset; --- 1309,1318 ---- ** representation. This uses "... ??:59:60" et seq. */ tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; ! ip = mon_lengths[isleap(y)]; ! for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) ! idays -= ip[tmp->tm_mon]; ! tmp->tm_mday = (int) (idays + 1); tmp->tm_isdst = 0; #ifdef TM_GMTOFF tmp->TM_GMTOFF = offset; *************** *** 1486,1492 **** */ t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits); for ( ; ; ) { ! /* XXX */ (void) (*funcp)(&t, offset, &mytm); dir = tmcomp(&mytm, &yourtm); if (dir != 0) { if (bits-- < 0) --- 1529,1536 ---- */ t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits); for ( ; ; ) { ! if ((*funcp)(&t, offset, &mytm) == NULL) ! return WRONG; /* XXX probably wrong */ dir = tmcomp(&mytm, &yourtm); if (dir != 0) { if (bits-- < 0) *************** *** 1524,1530 **** continue; newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; ! /* XXX */ (void) (*funcp)(&newt, offset, &mytm); if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) --- 1568,1575 ---- continue; newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; ! if ((*funcp)(&newt, offset, &mytm) == NULL) ! return WRONG; /* XXX probably wrong */ if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst)

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Tzcode2005a.tar.gz and tzdata2005a.tar.gz
by Olson, Arthur David (NIH/NCI) Jan. 1, 2005

Jan. 1, 2005

The files ftp://elsie.nci.nih.gov/pub/tzcode2005a.tar.gz and ftp://elsie.nci.nih.gov/pub/tzdata2005a.tar.gz are now available. These incorporate the changes circulated in the last week of 2004 on the time zone mailing list. --ado

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RE: Proposed changes to asctime.c, zdump.c, and localtime.c
by Olson, Arthur David (NIH/NCI) Dec. 30, 2004

Dec. 30, 2004

Thanks to Paul and Ken for the feedback on zdump.c. Here's the next iteration; these changes are relative to the code now available via ftp. --ado ------- zdump.c ------- *** /tmp/geta16007 Thu Dec 30 08:46:20 2004 --- /tmp/getb16007 Thu Dec 30 08:46:20 2004 *************** *** 1,4 **** ! static char elsieid[] = "@(#)zdump.c 7.57"; /* ** This code has been made independent of the rest of the time --- 1,4 ---- ! static char elsieid[] = "@(#)zdump.c 7.59"; /* ** This code has been made independent of the rest of the time *************** *** 151,156 **** --- 151,157 ---- static time_t hunt P((char * name, time_t lot, time_t hit)); static void setabsolutes(); static void show P((char * zone, time_t t, int v)); + static const char * tformat P((void)); static time_t yeartot P((long y)); int *************** *** 469,475 **** if (v) { tmp = gmtime(&t); if (tmp == NULL) { ! (void) printf("%g", (double) t); } else { dumptime(tmp); (void) printf(" UTC"); --- 470,476 ---- if (v) { tmp = gmtime(&t); if (tmp == NULL) { ! (void) printf(tformat(), t); } else { dumptime(tmp); (void) printf(" UTC"); *************** *** 504,509 **** --- 505,537 ---- return (result == NULL) ? &nada : result; } + /* + ** The code below can fail on certain theoretical systems; + ** it works on all known real-world systems as of 2004-12-30. + */ + + static const char * + tformat() + { + if (0.5 == (time_t) 0.5) { /* floating */ + if (sizeof (time_t) > sizeof (double)) + return "%Lg"; + return "%g"; + } + if (0 > (time_t) -1) { /* signed */ + if (sizeof (time_t) > sizeof (long)) + return "%lld"; + if (sizeof (time_t) > sizeof (int)) + return "%ld"; + return "%d"; + } + if (sizeof (time_t) > sizeof (unsigned long)) + return "%llu"; + if (sizeof (time_t) > sizeof (unsigned int)) + return "%lu"; + return "%u"; + } + static void dumptime(timeptr) register const struct tm * timeptr;

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Proposed changes to asctime.c, zdump.c, and localtime.c
by Olson, Arthur David (NIH/NCI) Dec. 29, 2004

Dec. 29, 2004

Below find proposed changes, all (I hope) noncontroversial: 1. The addition of a comment to asctime.c warning against relying completely on strftime. 2. Changes to zdump.c to improve the output when gmtime() returns NULL and time_t is a strange type. 3. A fix to the declaration of wildabbr in localtime.c 4. Changes to some localtime.c internal functions from returning voids to returning struct tm *s. The last above is in preparation for doing a better job of handling the situation where a time_t value is fed to localtime or gmtime but the year associated with the time_t value won't fit in an int (as can happen if, for example, time_t is double). --ado ------- asctime.c ------- *** /tmp/geta3717 Mon Dec 27 09:18:15 2004 --- /tmp/getb3717 Mon Dec 27 09:18:15 2004 *************** *** 3,11 **** ** 1996-06-05 by Arthur David Olson (arthur_david_olson(a)nih.gov) */ #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)asctime.c 7.29"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 3,17 ---- ** 1996-06-05 by Arthur David Olson (arthur_david_olson(a)nih.gov) */ + /* + ** Avoid the temptation to punt entirely to strftime; + ** the output of strftime is supposed to be locale specific + ** whereas the output of asctime is supposed to be constant. + */ + #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)asctime.c 7.30"; #endif /* !defined NOID */ #endif /* !defined lint */ ------- zdump.c ------- *** /tmp/geta3736 Mon Dec 27 09:18:15 2004 --- /tmp/getb3736 Mon Dec 27 09:18:15 2004 *************** *** 1,4 **** ! static char elsieid[] = "@(#)zdump.c 7.57"; /* ** This code has been made independent of the rest of the time --- 1,4 ---- ! static char elsieid[] = "@(#)zdump.c 7.58"; /* ** This code has been made independent of the rest of the time *************** *** 151,156 **** --- 151,157 ---- static time_t hunt P((char * name, time_t lot, time_t hit)); static void setabsolutes(); static void show P((char * zone, time_t t, int v)); + static char * tformat P((void)); static time_t yeartot P((long y)); int *************** *** 469,475 **** if (v) { tmp = gmtime(&t); if (tmp == NULL) { ! (void) printf("%g", (double) t); } else { dumptime(tmp); (void) printf(" UTC"); --- 470,476 ---- if (v) { tmp = gmtime(&t); if (tmp == NULL) { ! (void) printf(tformat(), t); } else { dumptime(tmp); (void) printf(" UTC"); *************** *** 504,509 **** --- 505,529 ---- return (result == NULL) ? &nada : result; } + static char * + tformat() + { + if (0.5 == (time_t) 0.5) /* floating */ + return "%g"; + if (0 > (time_t) -1) { /* signed */ + if (sizeof (time_t) > sizeof (long)) + return "%lld"; + if (sizeof (time_t) == sizeof (long)) + return "%ld"; + return "%d"; + } + if (sizeof (time_t) > sizeof (unsigned long)) + return "%llu"; + if (sizeof (time_t) == sizeof (unsigned long)) + return "%lu"; + return "%u"; + } + static void dumptime(timeptr) register const struct tm * timeptr; ------- localtime.c ------- *** /tmp/geta3754 Mon Dec 27 09:18:15 2004 --- /tmp/getb3754 Mon Dec 27 09:18:15 2004 *************** *** 2,7 **** --- 2,8 ---- ** XXX--do the right thing if time_t is double and ** the value fed to gmtime or localtime is very very negative or ** very very positive (which causes problems with the days-and-rem logic). + ** Also: do the right thing in mktime if time_t is double. */ /* *************** *** 11,17 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.83"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 12,18 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.85"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 61,67 **** #define WILDABBR " " #endif /* !defined WILDABBR */ ! static char wildabbr[] = "WILDABBR"; static const char gmt[] = "GMT"; --- 62,68 ---- #define WILDABBR " " #endif /* !defined WILDABBR */ ! static char wildabbr[] = WILDABBR; static const char gmt[] = "GMT"; *************** *** 135,143 **** static const char * getoffset P((const char * strp, long * offsetp)); static const char * getrule P((const char * strp, struct rule * rulep)); static void gmtload P((struct state * sp)); ! static void gmtsub P((const time_t * timep, long offset, struct tm * tmp)); ! static void localsub P((const time_t * timep, long offset, struct tm * tmp)); static int increment_overflow P((int * number, int delta)); static int long_increment_overflow P((long * number, int delta)); --- 136,144 ---- static const char * getoffset P((const char * strp, long * offsetp)); static const char * getrule P((const char * strp, struct rule * rulep)); static void gmtload P((struct state * sp)); ! static struct tm * gmtsub P((const time_t * timep, long offset, struct tm * tmp)); ! static struct tm * localsub P((const time_t * timep, long offset, struct tm * tmp)); static int increment_overflow P((int * number, int delta)); static int long_increment_overflow P((long * number, int delta)); *************** *** 147,164 **** int base)); static void settzname P((void)); static time_t time1 P((struct tm * tmp, ! void(*funcp) P((const time_t *, long, struct tm *)), long offset)); static time_t time2 P((struct tm *tmp, ! void(*funcp) P((const time_t *, long, struct tm*)), long offset, int * okayp)); static time_t time2sub P((struct tm *tmp, ! void(*funcp) P((const time_t *, long, struct tm*)), long offset, int * okayp, int do_norm_secs)); ! static void timesub P((const time_t * timep, long offset, const struct state * sp, struct tm * tmp)); static int tmcomp P((const struct tm * atmp, const struct tm * btmp)); --- 148,165 ---- int base)); static void settzname P((void)); static time_t time1 P((struct tm * tmp, ! struct tm * (*funcp) P((const time_t *, long, struct tm *)), long offset)); static time_t time2 P((struct tm *tmp, ! struct tm * (*funcp) P((const time_t *, long, struct tm*)), long offset, int * okayp)); static time_t time2sub P((struct tm *tmp, ! struct tm * (*funcp) P((const time_t *, long, struct tm*)), long offset, int * okayp, int do_norm_secs)); ! static struct tm * timesub P((const time_t * timep, long offset, const struct state * sp, struct tm * tmp)); static int tmcomp P((const struct tm * atmp, const struct tm * btmp)); *************** *** 1033,1039 **** */ /*ARGSUSED*/ ! static void localsub(timep, offset, tmp) const time_t * const timep; const long offset; --- 1034,1040 ---- */ /*ARGSUSED*/ ! static struct tm * localsub(timep, offset, tmp) const time_t * const timep; const long offset; *************** *** 1042,1055 **** register struct state * sp; register const struct ttinfo * ttisp; register int i; const time_t t = *timep; sp = lclptr; #ifdef ALL_STATE ! if (sp == NULL) { ! gmtsub(timep, offset, tmp); ! return; ! } #endif /* defined ALL_STATE */ if (sp->timecnt == 0 || t < sp->ats[0]) { i = 0; --- 1043,1055 ---- register struct state * sp; register const struct ttinfo * ttisp; register int i; + register struct tm * result; const time_t t = *timep; sp = lclptr; #ifdef ALL_STATE ! if (sp == NULL) ! return gmtsub(timep, offset, tmp); #endif /* defined ALL_STATE */ if (sp->timecnt == 0 || t < sp->ats[0]) { i = 0; *************** *** 1071,1082 **** ** t += ttisp->tt_gmtoff; ** timesub(&t, 0L, sp, tmp); */ ! timesub(&t, ttisp->tt_gmtoff, sp, tmp); tmp->tm_isdst = ttisp->tt_isdst; tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; #ifdef TM_ZONE tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; #endif /* defined TM_ZONE */ } struct tm * --- 1071,1083 ---- ** t += ttisp->tt_gmtoff; ** timesub(&t, 0L, sp, tmp); */ ! result = timesub(&t, ttisp->tt_gmtoff, sp, tmp); tmp->tm_isdst = ttisp->tt_isdst; tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; #ifdef TM_ZONE tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; #endif /* defined TM_ZONE */ + return result; } struct tm * *************** *** 1084,1091 **** const time_t * const timep; { tzset(); ! localsub(timep, 0L, &tm); ! return &tm; } /* --- 1085,1091 ---- const time_t * const timep; { tzset(); ! return localsub(timep, 0L, &tm); } /* *************** *** 1097,1104 **** const time_t * const timep; struct tm * tm; { ! localsub(timep, 0L, tm); ! return tm; } /* --- 1097,1103 ---- const time_t * const timep; struct tm * tm; { ! return localsub(timep, 0L, tm); } /* *************** *** 1105,1116 **** ** gmtsub is to gmtime as localsub is to localtime. */ ! static void gmtsub(timep, offset, tmp) const time_t * const timep; const long offset; struct tm * const tmp; { if (!gmt_is_set) { gmt_is_set = TRUE; #ifdef ALL_STATE --- 1104,1117 ---- ** gmtsub is to gmtime as localsub is to localtime. */ ! static struct tm * gmtsub(timep, offset, tmp) const time_t * const timep; const long offset; struct tm * const tmp; { + register struct tm * result; + if (!gmt_is_set) { gmt_is_set = TRUE; #ifdef ALL_STATE *************** *** 1119,1125 **** #endif /* defined ALL_STATE */ gmtload(gmtptr); } ! timesub(timep, offset, gmtptr, tmp); #ifdef TM_ZONE /* ** Could get fancy here and deliver something such as --- 1120,1126 ---- #endif /* defined ALL_STATE */ gmtload(gmtptr); } ! result = timesub(timep, offset, gmtptr, tmp); #ifdef TM_ZONE /* ** Could get fancy here and deliver something such as *************** *** 1139,1144 **** --- 1140,1146 ---- #endif /* State Farm */ } #endif /* defined TM_ZONE */ + return result; } struct tm * *************** *** 1145,1152 **** gmtime(timep) const time_t * const timep; { ! gmtsub(timep, 0L, &tm); ! return &tm; } /* --- 1147,1153 ---- gmtime(timep) const time_t * const timep; { ! return gmtsub(timep, 0L, &tm); } /* *************** *** 1158,1165 **** const time_t * const timep; struct tm * tm; { ! gmtsub(timep, 0L, tm); ! return tm; } #ifdef STD_INSPIRED --- 1159,1165 ---- const time_t * const timep; struct tm * tm; { ! return gmtsub(timep, 0L, tm); } #ifdef STD_INSPIRED *************** *** 1169,1181 **** const time_t * const timep; const long offset; { ! gmtsub(timep, offset, &tm); ! return &tm; } #endif /* defined STD_INSPIRED */ ! static void timesub(timep, offset, sp, tmp) const time_t * const timep; const long offset; --- 1169,1180 ---- const time_t * const timep; const long offset; { ! return gmtsub(timep, offset, &tm); } #endif /* defined STD_INSPIRED */ ! static struct tm * timesub(timep, offset, sp, tmp) const time_t * const timep; const long offset; *************** *** 1275,1280 **** --- 1274,1280 ---- #ifdef TM_GMTOFF tmp->TM_GMTOFF = offset; #endif /* defined TM_GMTOFF */ + return tmp; } char * *************** *** 1391,1397 **** static time_t time2sub(tmp, funcp, offset, okayp, do_norm_secs) struct tm * const tmp; ! void (* const funcp) P((const time_t*, long, struct tm*)); const long offset; int * const okayp; const int do_norm_secs; --- 1391,1397 ---- static time_t time2sub(tmp, funcp, offset, okayp, do_norm_secs) struct tm * const tmp; ! struct tm * (* const funcp) P((const time_t*, long, struct tm*)); const long offset; int * const okayp; const int do_norm_secs; *************** *** 1486,1492 **** */ t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits); for ( ; ; ) { ! (*funcp)(&t, offset, &mytm); dir = tmcomp(&mytm, &yourtm); if (dir != 0) { if (bits-- < 0) --- 1486,1492 ---- */ t = TYPE_SIGNED(time_t) ? 0 : (((unsigned long) 1) << bits); for ( ; ; ) { ! /* XXX */ (void) (*funcp)(&t, offset, &mytm); dir = tmcomp(&mytm, &yourtm); if (dir != 0) { if (bits-- < 0) *************** *** 1524,1530 **** continue; newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; ! (*funcp)(&newt, offset, &mytm); if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) --- 1524,1530 ---- continue; newt = t + sp->ttis[j].tt_gmtoff - sp->ttis[i].tt_gmtoff; ! /* XXX */ (void) (*funcp)(&newt, offset, &mytm); if (tmcomp(&mytm, &yourtm) != 0) continue; if (mytm.tm_isdst != yourtm.tm_isdst) *************** *** 1543,1550 **** if ((newt < t) != (saved_seconds < 0)) return WRONG; t = newt; ! (*funcp)(&t, offset, tmp); ! *okayp = TRUE; return t; } --- 1543,1550 ---- if ((newt < t) != (saved_seconds < 0)) return WRONG; t = newt; ! if ((*funcp)(&t, offset, tmp)) ! *okayp = TRUE; return t; } *************** *** 1551,1557 **** static time_t time2(tmp, funcp, offset, okayp) struct tm * const tmp; ! void (* const funcp) P((const time_t*, long, struct tm*)); const long offset; int * const okayp; { --- 1551,1557 ---- static time_t time2(tmp, funcp, offset, okayp) struct tm * const tmp; ! struct tm * (* const funcp) P((const time_t*, long, struct tm*)); const long offset; int * const okayp; { *************** *** 1569,1575 **** static time_t time1(tmp, funcp, offset) struct tm * const tmp; ! void (* const funcp) P((const time_t *, long, struct tm *)); const long offset; { register time_t t; --- 1569,1575 ---- static time_t time1(tmp, funcp, offset) struct tm * const tmp; ! struct tm * (* const funcp) P((const time_t *, long, struct tm *)); const long offset; { register time_t t;

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Israel 2005 and Beyond -- Proposed Timezone Dates
by Ephraim Silverberg Dec. 21, 2004

Dec. 21, 2004

Yesterday, the Knesset Interior Committee passed a proposed (originally in March 2004) change to the Time Setting Law that would make the dates for DST from 2005 and beyond so that DST starts on the night _after_ the first night of the Passover holiday at midnight until midnight of the Saturday night _before_ the fast of Yom Kippur. Those who can read Hebrew can view the proposal at: ftp://ftp.cs.huji.ac.il/pub/tz/announcements/2005+.ps The proposal still has to be passed by the Knesset (three readings) for it to become law so I'm not sure if they should be incorporated in the global TZ database, but I'm attaching the diffs just in case. I have only calculated the dates for ten years (2005-2014), but if the law passes, I will write a C programme that will output TZ times for Israel for any given year. I will inform the list if and when the law passes the legislative process and if any amendments are made on the way. ___________________________________________________________________________ Ephraim Silverberg, CSE System Group, Phone number: 972-2-6585521 Hebrew University, Jerusalem, Israel. Fax number: 972-2-5617723 WWW: http://www.cs.huji.ac.il/~ephraim E-mail: ephraim(a)cse.huji.ac.il

2 1

Tzcode2004i.tar.gz
by Olson, Arthur David (NIH/NCI) Dec. 14, 2004

Dec. 14, 2004

The file... ftp://elsie.nci.nih.gov/pub/tzcode2004i.tar.gz ...is now available; this incorporates the changes circulated last week to deal with systems where time_t is unsigned. --ado

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FW: Hokkaido "Daylight Savings Time" experiment last summer
by Olson, Arthur David (NIH/NCI) Dec. 13, 2004

Dec. 13, 2004

Jonathan Lennox is on the time zone mailing list as lennox@cs... --ado -----Original Message----- From: Jonathan Lennox [mailto:lennox@cnr.cs.columbia.edu] Sent: Monday, December 13, 2004 2:28 PM To: List Time Zone (E-mail) Subject: Hokkaido "Daylight Savings Time" experiment last summer I don't think this has been mentioned yet on the time zone list. This past summer, a number of companies in Sapporo, the capital of Hokkaido in northern Japan, experimented with a trial-run of Daylight Savings Time in order to boost the local economy, which seems to have been somewhat successful. The experiment seems to have involved just changing working hours, rather than actually changing the clocks, but there are proposals to apply it officially. News stories, in English: Japan Times: <http://202.221.217.59/print/news/nn08-2004/nn20040819a9.htm> Asahi Shimbun: <http://www.asahi.com/english/nation/TKY200408170187.html> I originally spotted this in this week's issue of The Economist, but given the track record (see the comment on Asia/Baghdad) I thought I'd confirm it elsehwere. -- Jonathan Lennox lennox(a)cs.columbia.edu

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