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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.

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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

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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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Hokkaido "Daylight Savings Time" experiment last summer
by Jonathan Lennox Dec. 13, 2004

Dec. 13, 2004

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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