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United States Naval Observatory time zone data available via browsers
by ado Oct. 28, 1995

Oct. 28, 1995

The URL is http://tycho.usno.navy.mil/tzones.html --ado

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tzcode95f.tar.gz and tzdata95j.tar.gz
by ado Oct. 28, 1995

Oct. 28, 1995

These new files... -rw-r--r-- 1 ado 65981 Oct 28 16:57 tzcode95f.tar.gz -rw-r--r-- 1 ado 69781 Oct 28 16:57 tzdata95j.tar.gz ...are available by anonymous ftp from elsie.nci.nih.gov (165.112.73.1) in the ~ftp/pub directory. The files incorporate European cleanups circulated earlier on the time zone mailing list; they also provide support for 64-bit time_t's and optimization in localtime.c --ado

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Re: old time zones (europe)
by Dik.Winter＠cwi.nl Oct. 25, 1995

Oct. 25, 1995

> There are some inconsistencies in the file: Indeed, but others than you are seeing. > Also, according to the Germany entry and to my vague memory, Germany > introduced DST in 1980 rather than 1981, which put pressure on all the > small ES countries to come to some kind of harmonisation. The file correctly notes that Germany introduced it in 1980 and Switzerland, Austria and Liechtenstein in 1981 (at least in version 95i). However there is a inconsistency in one of the lines for Luxembourg. It states: 1:00 Belgium MET%s 1979 while a similar line for Brussels states 1977. Should be changed in Luxembourg (the BeNeLux switched to "EC" rules in 1977). Further with respect to France. The file states that Shanks has no data on summertime in France in 1975 but that there is a note that states that summertime has been used. I just checked the Dutch railway timetable for summer 1975 and it says nothing about summer- time in France, so I presume no summertime. (In a later year, when it was unsure whether Germany would already switch to summer time until a very late stage the Dutch railway timetable came with double tables when Germany was involved. One for when summertime would be introduced and one when it would not be introduced.) The timetables are pretty good to establish in what years summertime was used; not for the exact starting and ending dates. dik -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924098 home: bovenover 215, 1025 jn amsterdam, nederland; e-mail: dik(a)cwi.nl

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Re: old time zones (europe)
by bs＠cs.uni-sb.de Oct. 25, 1995

Oct. 25, 1995

Rolf-Martin Mantel writes: [...] > Also, according to the Germany entry and to my vague memory, Germany > introduced DST in 1980 rather than 1981, which put pressure on all the > small ES countries to come to some kind of harmonisation. That's correct. I have here a paper from the PTB (Physikalisch-Technische Bundesanstalt, Braunschweig - the responsible "time authority" for Germany) which states: 1980: Apr. 6 to Sept. 28 (!!) 1981: Mar. 29 to Sept. 27 ... Bernard Sieloff U of Saarbruecken, Germany

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old time zones (europe)
by Mr. Rolf-Martin Mantel Oct. 25, 1995

Oct. 25, 1995

There are some inconsistencies in the file: 1.) # ... # The only [current nonmember using EU rules] I can speak for is Estonia, # which uses EU dates but not at 01:00 GMT, they use midnight GMT. I don't # think they know yet what they will do from 1996 onwards. # ... In the individual entries, it is clearly pointed out that Switzerland, Liechtenstein and Norway use EU rules since 1981 or 82. # ...the European time rules are...standardized since 1981, when # most European coun[tr]ies started DST. Before that year, only # a few countries (UK, France, Italy) had DST, each according # to own national rules. In 1981, however, DST started on # 'Apr firstSun', and not on 'Mar lastSun' as in the following # years... # But also since 1981 there are some more national exceptions # than listed in 'europe': Switzerland, for example, joined DST # one year later, Denmark ended DST on 'Oct 1' instead of 'Sep # lastSun' in 1981---I don't know how they handle now. # Also, according to the Germany entry and to my vague memory, Germany introduced DST in 1980 rather than 1981, which put pressure on all the small ES countries to come to some kind of harmonisation. Rolf

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Re: Irish timezone error?
by ado Oct. 23, 1995

Oct. 23, 1995

> In Ireland, we change from BST to GMT on the 4th Sunday in October... > Is there a...version of these timezone files available, or a program > which would generate them properly? (I'm using Linux 1.3) The files available from anonymous ftp from elsie.nci.nih.gov (165.112.73.1) in the ~ftp/pub directory... -rw-r--r-- 1 ado 65805 Oct 13 13:24 tzcode95e.tar.gz -rw-r--r-- 1 ado 69404 Sep 26 10:44 tzdata95i.tar.gz ...reflect a fourth-Sunday-in-October switch in Dublin. --ado

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Irish timezone error?
by Colm Buckley Oct. 23, 1995

Oct. 23, 1995

Hmm - I wonder have you seen this before? In Ireland, we change from BST to GMT on the 4th Sunday in October - ie: an appropriate TZ would be GMT0BST-1,M3.5.0/1,M10.4.0/1 (I'm not 100% certain that the changeover time is 1:00am; it could be 2:00). Anyway, the standard "Eire", "GB-Eire" and "Europe/Dublin" all seem to use M10.5.0 as the change-back date. Is there a newer version of these timezone files available, or a program which would generate them properly? (I'm using Linux 1.3) Thanks in advance, Colm. -- Colm Buckley | EMail: Colm.Buckley(a)tcd.ie Phone: (+353 1) 6082336 Computer Science Dept | WWW: http://isg.cs.tcd.ie/cbuckley/ Trinity College | finger cbuckley(a)isg.cs.tcd.ie for more info. Dublin 2, Ireland | "Too many windows, not enough brain."

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Re: timezone stuff on 64 bit machines
by ado Oct. 23, 1995

Oct. 23, 1995

>> The fix is to use the fact that--at least for now--the calendar operates on >> a grand 2800-year cycle: any set of 2800 consecutive years contains exactly >> 1,022,679 days. A bit of modular arithmetic will get us where we want to be. > > To me this calls attention to a fundamental design flaw: any > computation of daylight savings time that involves looping a > billion times, or even a thousand, cannot be right. Under what > circumstances does this happen? The attached might be used to avoid thousands of loops. --ado SCCS/s.localtime.c: 7.45 vs. 7.48 *** 7.45/localtime.c Mon Oct 23 10:48:43 1995 --- 7.48/localtime.c Mon Oct 23 10:48:45 1995 *************** *** 1,6 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.45"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 1,6 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 7.48"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 1173,1191 **** if (tmp->tm_wday < 0) tmp->tm_wday += DAYSPERWEEK; y = EPOCH_YEAR; ! if (days >= 0) ! for ( ; ; ) { ! yleap = isleap(y); ! if (days < (long) year_lengths[yleap]) ! break; ! ++y; ! days = days - (long) year_lengths[yleap]; ! } ! else do { ! --y; ! yleap = isleap(y); ! days = days + (long) year_lengths[yleap]; ! } while (days < 0); tmp->tm_year = y - TM_YEAR_BASE; tmp->tm_yday = (int) days; ip = mon_lengths[yleap]; --- 1173,1190 ---- if (tmp->tm_wday < 0) tmp->tm_wday += DAYSPERWEEK; y = EPOCH_YEAR; ! #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400) ! while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) { ! register int 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];

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Re: proposed fixes for Chile etc.
by Dik.Winter＠cwi.nl Oct. 22, 1995

Oct. 22, 1995

+ # Europa + # uninhabited + I find this amusing. Perhaps it is better to make it Ile Europe? dik -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924098 home: bovenover 215, 1025 jn amsterdam, nederland; e-mail: dik(a)cwi.nl

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proposed zic.c change to cope with "32 < sizeof (time_t)"
by ado Oct. 22, 1995

Oct. 22, 1995

Attached is a proposed change to let zic.c cope gracefully when 32 < sizeof (time_t) I'll make it part of the ftpable stuff if nobody squawks in the next week. --ado SCCS/s.zic.c: 7.50 vs. 7.51 *** 7.50/zic.c Sat Oct 21 05:58:46 1995 --- 7.51/zic.c Sat Oct 21 05:58:47 1995 *************** *** 1,6 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)zic.c 7.50"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 1,6 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)zic.c 7.51"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 567,594 **** ifree(toname); } static void setboundaries P((void)) { register time_t bit; ! register int bii; for (bit = 1; bit > 0; bit <<= 1) ! continue; ! if (bit == 0) { /* time_t is an unsigned type */ ! tt_signed = FALSE; ! min_time = 0; ! max_time = ~(time_t) 0; if (sflag) ! max_time >>= 1; } else { ! tt_signed = TRUE; ! min_time = bit; ! max_time = bit; ! ++max_time; ! max_time = -max_time; if (sflag) ! min_time = 0; } min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year; max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year; --- 567,613 ---- ifree(toname); } + #define MAX_BITS_IN_FILE 32 + static void setboundaries P((void)) { register time_t bit; ! register int nbits; ! register int bii; + nbits = 0; for (bit = 1; bit > 0; bit <<= 1) ! ++nbits; ! tt_signed = (bit != 0); ! if (tt_signed) ! ++nbits; ! if (tt_signed) { ! if (nbits <= MAX_BITS_IN_FILE) { ! min_time = bit; ! max_time = bit; ! ++max_time; ! max_time = -max_time; ! } else { ! max_time = 1; ! max_time <<= (MAX_BITS_IN_FILE - 1); ! --max_time; ! min_time = max_time; ! --min_time; ! } if (sflag) ! min_time = 0; } else { ! min_time = 0; ! if (nbits <= MAX_BITS_IN_FILE) ! max_time = ~(time_t) 0; ! else { ! max_time = 1; ! max_time <<= MAX_BITS_IN_FILE; ! --max_time; ! } if (sflag) ! max_time >>= 1; } min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year; max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;

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