- tz - lists.iana.org

[PATCH 1/5] Don't cite Howse where no longer used
by Paul Eggert Feb. 23, 2021

Feb. 23, 2021

--- africa | 3 --- asia | 3 --- 2 files changed, 6 deletions(-) diff --git a/africa b/africa index 28168cf..fca9af7 100644 --- a/africa +++ b/africa @@ -30,9 +30,6 @@ # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. # https://www.jstor.org/stable/1774359 # -# A reliable and entertaining source about time zones is -# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). -# # European-style abbreviations are commonly used along the Mediterranean. # For sub-Saharan Africa abbreviations were less standardized. # Previous editions of this database used WAT, CAT, SAT, and EAT diff --git a/asia b/asia index ed94413..ac7def8 100644 --- a/asia +++ b/asia @@ -34,9 +34,6 @@ # Byalokoz EL. New Counting of Time in Russia since July 1, 1919. # (See the 'europe' file for a fuller citation.) # -# A reliable and entertaining source about time zones is -# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). -# # The following alphabetic abbreviations appear in these tables # (corrections are welcome): # std dst -- 2.27.0

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Some time zone history (2)
by P Chan Feb. 20, 2021

Feb. 20, 2021

Bahamas There were two periods of DST observed in 1941-1945: 1941-05-01 midnight to 1944-12-31 and 1945-02-01 to 1945-10-17 midnight. War Time Order 1942 [1942-05-01] and War Time (No. 2) Order 1942 [1942-09-29] Appendix to the Statutes of 7 George VI. and the Year 1942. p 34, 43 https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA3-PA34 https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA3-PA43 War Time Order 1943 [1943-03-31] and War Time Order 1944 [1943-12-29] Appendix to the Statutes of 8 George VI. and the Year 1943. p 9-10, 28-29 https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA4-PA9 https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA4-PA28 War Time Order 1945 [1945-01-31] and the Order which revoke War Time Order 1945 [1945-10-16] Appendix to the Statutes of 9 George VI. and the Year 1945. p 160, 247-248 https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA6-PA160 https://books.google.com/books?id=5rlNAQAAIAAJ&pg=RA6-PA247 ---------- Guyana British Guiana/Guyana adopted GMT-4 on 1911-08-01 , GMT-3:75 on 1915-03-01, GMT-3 on 1975-08-01 and GMT-4 on 1992-03-29. The Official Gazette of British Guiana. (New Series.) Vol. XL. July to December, 1915, p 1547 https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) [1975-07-31] https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpr… Interpretation and general clauses (Amendment) Act 1992 (Act No. 6 of 1992) [1992-04-18] https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_… Circular No. 10/1992 dated 1992-03-30 https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf ---------- Nigeria On 1914-01-01, standard time of GMT+0:30 was adopted for the unified Nigeria. Colonial Reports - Annual. No. 878. Nigeria. Report for 1914. (April 1916), p 27 https://libsysdigi.library.illinois.edu/ilharvest/Africana/Books2011-05/306… Interpretation Ordinance, 1914 (No. 4 of 1914) [1914-10-01] https://books.google.com.hk/books?id=mm5CAQAAMAAJ&pg=PA172 In 1919, standard time was changed to GMT+1. Interpretation Ordinance (Cap 2) The Laws of Nigeria, Containing the Ordinances of Nigeria, in Force on the 1st Day of January, 1923, Vol.I p 5-18 https://books.google.com.hk/books?id=BOMrAQAAMAAJ&pg=PA16 For the standard time used in Lagos before 1914, the Interpretation Ordinance of Southern Nigeria, 1908 revised edition defined “Time” to mean Greenwich time. That section was originated from Proclamation No. 11 of 1905 of the Protectorate of Southern Nigeria. But the Colony of Lagos was not merged into Southern Nigeria until May 1906. Moreover, the 1906 Report of Southern Nigeria says “all laws in force in any part of the territory prior to the commencement of the new system of government shall continue in force until further provision is made by the local legislature.” Lloyd's Register of Shipping (1915) says “Hitherto the time observed in Lagos was the local mean time. On 1st January, 1914, standard time for the whole of Nigeria was introduced … Lagos time has been advanced about 16 minutes accordingly.” Therefore it is possible that no standard time was adopted in Lagos until 1914. Interpretation Ordinance (Cap 2) Laws of the Colony of Southern Nigeria : being the schedule to the Statute laws revision ordinance, 1908, Vol.I, p 3-11 https://babel.hathitrust.org/cgi/pt?id=mdp.35112105426037&view=1up&seq=61 Colonial Reports - Annual. No. 554. Southern Nigeria. Report for 1906. (February 1908), p 43 https://libsysdigi.library.illinois.edu/ilharvest/Africana/Books2011-05/306… Lloyd's Register of Shipping. 1915-16. Vol. II.-Appendix. ,p 655 https://books.google.com/books?id=b_ROAQAAIAAJ&pg=PA655 ---------- Seychelles Standard Time was adopted on 1907-01-01. Standard Time Ordinance (Chapter 237) The Laws of Seychelles in Force on the 31st December, 1971, Vol. 6, p 571 https://books.google.com/books?id=efE-AQAAIAAJ&pg=PA571 ---------- Turks and Caicos Islands Standard Time Declaration Order 2015 (L.N. 15/2015) http://online.fliphtml5.com/fizd/czin/#p=2 Standard Time Declaration Order 2017 (L.N. 31/2017) http://online.fliphtml5.com/fizd/dmcu/#p=2 ---------- Vanuatu DST was observed in 1973/1974. The spring forward in 1984 should be on Sep 23. Joint Daylight Saving Regulation No 59 of 1973 New Hebrides Condominium Gazette No 336. December 1973 http://www.paclii.org/vu/other/VUNHGovGaz//1973/11.pdf#page=15 Joint Daylight Saving (Repeal) Regulation No 10 of 1974 New Hebrides Condominium Gazette No 336. March 1974 http://www.paclii.org/vu/other/VUNHGovGaz//1974/3.pdf#page=11 Summer Time Act No. 35 of 1982 [1983-09-01] http://www.paclii.org/vu/other/VUGovGaz/1982/32.pdf#page=48 Summer Time Act (Cap 157) Laws of the Republic of Vanuatu Revised Edition 1988 http://www.paclii.org/cgi-bin/sinodisp/vu/legis/consol_act1988/sta147/sta14… Summer Time (Amendment) Act No. 6 of 1991 [1991-11-11] http://www.paclii.org/vu/legis/num_act/sta1991227/ Summer Time (Repeal) Act No. 4 of 1993 [1993-05-03] http://www.paclii.org/vu/other/VUGovGaz/1993/15.pdf#page=59

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[PATCH] Fixups for today’s patches
by Paul Eggert Feb. 17, 2021

Feb. 17, 2021

* NEWS: Mention the recent all-year DST change. * zic.c (stringzone): Fix sign bug. --- NEWS | 7 +++++++ zic.c | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index af5dd9f..f3c94ed 100644 --- a/NEWS +++ b/NEWS @@ -20,6 +20,13 @@ Unreleased, experimental changes last time transition disagreed with the TZ string, contrary to Internet RFC 8563 section 3.3. + zic now generates a POSIX-conforming TZ string for TZif files + where all-year DST is predicted for the indefinite future. + For example, for all-year Eastern Daylight Time, zic now generates + "XXX3EDT4,0/0,J365/23" where it previously generated + "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for + noting the possibility of POSIX conformance.) + Release 2021a - 2021-01-24 10:54:57 -0800 diff --git a/zic.c b/zic.c index 4893a32..b91cb6c 100644 --- a/zic.c +++ b/zic.c @@ -2519,7 +2519,7 @@ stringzone(char *result, struct zone const *zpfirst, ptrdiff_t zonecount) Fake a timezone with negative DST. */ stdzp = &zstr[0]; dstzp = &zstr[1]; - zstr[0].z_stdoff = zp->z_stdoff - 2 * save; + zstr[0].z_stdoff = zp->z_stdoff + 2 * save; zstr[0].z_format = "XXX"; /* Any 3 letters will do. */ zstr[0].z_format_specifier = 0; zstr[1].z_stdoff = zstr[0].z_stdoff; -- 2.27.0

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[PATCH 1/4] Avoid use of local statics
by Paul Eggert Feb. 17, 2021

Feb. 17, 2021

* zic.c (inrule, inzsub, writezone): Avoid use of static when auto will do. This can help GCC catch uninitialized-variable errors. --- zic.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/zic.c b/zic.c index 51977b2..8653fb0 100644 --- a/zic.c +++ b/zic.c @@ -1341,7 +1341,7 @@ getsave(char *field, bool *isdst) static void inrule(char **fields, int nfields) { - static struct rule r; + struct rule r; if (nfields != RULE_FIELDS) { error(_("wrong number of fields on Rule line")); @@ -1418,7 +1418,7 @@ inzsub(char **fields, int nfields, bool iscont) { register char * cp; char * cp1; - static struct zone z; + struct zone z; register int i_stdoff, i_rule, i_format; register int i_untilyear, i_untilmonth; register int i_untilday, i_untiltime; @@ -1868,8 +1868,6 @@ writezone(const char *const name, const char *const string, char version, register FILE * fp; register ptrdiff_t i, j; register int pass; - static const struct tzhead tzh0; - static struct tzhead tzh; bool dir_checked = false; zic_t one = 1; zic_t y2038_boundary = one << 31; @@ -2000,6 +1998,7 @@ writezone(const char *const name, const char *const string, char version, for (pass = 1; pass <= 2; ++pass) { register ptrdiff_t thistimei, thistimecnt, thistimelim; register int thisleapi, thisleapcnt, thisleaplim; + struct tzhead tzh; int currenttype, thisdefaulttype; bool locut, hicut; zic_t lo; @@ -2168,7 +2167,7 @@ writezone(const char *const name, const char *const string, char version, thistimelim = thistimei; } #define DO(field) fwrite(tzh.field, sizeof tzh.field, 1, fp) - tzh = tzh0; + memset(&tzh, 0, sizeof tzh); memcpy(tzh.tzh_magic, TZ_MAGIC, sizeof tzh.tzh_magic); tzh.tzh_version[0] = version; convert(utcnt, tzh.tzh_ttisutcnt); -- 2.27.0

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State of Palestine Time zone - need to update
by heba hamad Feb. 13, 2021

Feb. 13, 2021

Dear Sir/Madam, In reference to your recent response at 25 Oct,2020 regarding State of Palestine's request to correct the 'Time Zone Database', we would like to confirm that 'TZ' related to the State of Palestine is as follows: PS State of Palestine Asia/East Jerusalem UTC +2:00 Also, we would like to inform you that the State of Palestine comprises of the West Bank, including East Jerusalem and Gaza, all of which are integral parts of the State of Palestine, thus, as one territorial unit all areas belong to the same time zone. We would like to also emphasize that East Jerusalem is an integral part of the West Bank as stipulated under international law and by numerous international resolutions. Therefore, we urge you to adopt the official name and correct your data base. Best Regards, Heba Hamad 11 Feb,2021

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[PATCH 1/2] Remove unused C macros
by Paul Eggert Feb. 13, 2021

Feb. 13, 2021

Also, pacify ‘gcc -Wunused-macros’, which was employed to find these unused macros. * localtime.c (NETBSD_INSPIRED_EXTERN): Define only if STD_INSPIRED is defined. * private.h (sys_time) [!TZ_TIME_T]: Inspect LOCALTIME_IMPLEMENTATION. * zdump.c (MAX_STRING_LENGTH): * zic.c (PRIdZIC): Remove these macros, which are no longer used. --- localtime.c | 16 ++++++++-------- private.h | 7 ++++--- zdump.c | 4 ---- zic.c | 1 - 4 files changed, 12 insertions(+), 16 deletions(-) diff --git a/localtime.c b/localtime.c index d3e406b..82a3b70 100644 --- a/localtime.c +++ b/localtime.c @@ -28,14 +28,6 @@ static int lock(void) { return 0; } static void unlock(void) { } #endif -/* NETBSD_INSPIRED_EXTERN functions are exported to callers if - NETBSD_INSPIRED is defined, and are private otherwise. */ -#if NETBSD_INSPIRED -# define NETBSD_INSPIRED_EXTERN -#else -# define NETBSD_INSPIRED_EXTERN static -#endif - #ifndef TZ_ABBR_MAX_LEN #define TZ_ABBR_MAX_LEN 16 #endif /* !defined TZ_ABBR_MAX_LEN */ @@ -2247,6 +2239,14 @@ leapcorr(struct state const *sp, time_t t) #ifdef STD_INSPIRED +/* NETBSD_INSPIRED_EXTERN functions are exported to callers if + NETBSD_INSPIRED is defined, and are private otherwise. */ +# if NETBSD_INSPIRED +# define NETBSD_INSPIRED_EXTERN +# else +# define NETBSD_INSPIRED_EXTERN static +# endif + /* ** IEEE Std 1003.1 (POSIX) says that 536457599 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which diff --git a/private.h b/private.h index 9efcd78..a919e4f 100644 --- a/private.h +++ b/private.h @@ -418,10 +418,11 @@ typedef unsigned long uintmax_t; # define TZ_TIME_T 0 #endif -#if TZ_TIME_T -# ifdef LOCALTIME_IMPLEMENTATION +#if defined LOCALTIME_IMPLEMENTATION && TZ_TIME_T static time_t sys_time(time_t *x) { return time(x); } -# endif +#endif + +#if TZ_TIME_T typedef time_tz tz_time_t; diff --git a/zdump.c b/zdump.c index b532fe3..57e363e 100644 --- a/zdump.c +++ b/zdump.c @@ -42,10 +42,6 @@ #define ZDUMP_HI_YEAR 2500 #endif /* !defined ZDUMP_HI_YEAR */ -#ifndef MAX_STRING_LENGTH -#define MAX_STRING_LENGTH 1024 -#endif /* !defined MAX_STRING_LENGTH */ - #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) #define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \ diff --git a/zic.c b/zic.c index b37cdc9..51977b2 100644 --- a/zic.c +++ b/zic.c @@ -21,7 +21,6 @@ typedef int_fast64_t zic_t; #define ZIC_MIN INT_FAST64_MIN #define ZIC_MAX INT_FAST64_MAX -#define PRIdZIC PRIdFAST64 #define SCNdZIC SCNdFAST64 #ifndef ZIC_MAX_ABBR_LEN_WO_WARN -- 2.27.0

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[PATCH] Clarify GCC pacification in previous fix
by Paul Eggert Feb. 13, 2021

Feb. 13, 2021

* zic.c (outzone): Make it clear that prevktime is initialized only to pacify GCC. --- zic.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/zic.c b/zic.c index a864bc4..b37cdc9 100644 --- a/zic.c +++ b/zic.c @@ -2715,7 +2715,8 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) for (i = 0; i < zonecount; ++i) { struct rule *prevrp = NULL; - zic_t prevktime = min_time; + zic_t prevktime; + INITIALIZE(prevktime); /* ** A guess that may well be corrected later. */ -- 2.27.0

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[PATCH] Fix bug in last time type of Asia/Gaza etc.
by Paul Eggert Feb. 13, 2021

Feb. 13, 2021

* zic.c (outzone): When avoiding bloat due to transitions deducible from the TZ string, don’t eliminate transitions that are before any lower-bound cutoff established by -r. All but the last of these transitions will be discarded later by limitrange, and the last transition is needed so that the dummy time type after the TZif file’s last transition agrees with the TZ string as required by Internet RFC 8536 section 3.3. This problem can be observed in tzdb 2021a if you run the command ‘zic -r@2145916800 asia’: the output file Asia/Gaza’s only time transition, which is at the specified time 2038-01-01 00:00:00 UTC, has an associated time type that specifies +03 with DST, rather than the correct +02 without DST. --- NEWS | 6 ++++++ zic.c | 4 +++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index b9d5777..a22e8ff 100644 --- a/NEWS +++ b/NEWS @@ -6,6 +6,12 @@ Unreleased, experimental changes Portugal observed DST in 1950. (Thanks to Alois Treindl.) + Changes to code + + Fix bug in zic -r; in some cases, the dummy time type after the + last time transition disagreed with the TZ string, contrary to + Internet RFC 8563 section 3.3. + Release 2021a - 2021-01-24 10:54:57 -0800 diff --git a/zic.c b/zic.c index a902b34..a864bc4 100644 --- a/zic.c +++ b/zic.c @@ -2715,6 +2715,7 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) for (i = 0; i < zonecount; ++i) { struct rule *prevrp = NULL; + zic_t prevktime = min_time; /* ** A guess that may well be corrected later. */ @@ -2851,7 +2852,7 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) rp->r_isdst, rp->r_save, false); offset = oadd(zp->z_stdoff, rp->r_save); if (!want_bloat() && !useuntil && !do_extend - && prevrp + && prevrp && lo_time <= prevktime && rp->r_hiyear == ZIC_MAX && prevrp->r_hiyear == ZIC_MAX) break; @@ -2865,6 +2866,7 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) lastatmax = timecnt; addtt(ktime, type); prevrp = rp; + prevktime = ktime; } } if (usestart) { -- 2.27.0

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Replying to government officials
by John Hawkinson Feb. 12, 2021

Feb. 12, 2021

I wonder if we should have some kind of understanding of when it is appropriate for the general members of the list to respond to emails from government officials, versus deferring that task to the project coordinators. (I have thought this was a concern for some time, but multiple recent messages have amplified it in my mind.) -- jhawk(a)alum.mit.edu John Hawkinson

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DST existed in Portugal 1950
by Alois Treindl Feb. 10, 2021

Feb. 10, 2021

TZ claims that in 1950 there was no DST in Portugal, zone Europe/Lisbon. While it was continuously applied between 1916 and 1965. The sources quoted in file europe are poor, it is only Whitman versus Shanks/Pottenger. I have research online law collection for Portugal at https://dre.pt/ and searched for 'hora de verão'. The results are sparse, but what I find on legal texts does not indicate any interruption of the 1916 law for the year 1950. This Wikipedia page shows a list https://pt.wikipedia.org/wiki/Lista_de_per%C3%ADodos_em_que_vigorou_o_hor%C… and mentions the Decreto-Lei nº 37048 for 1949-1965. That law says 'first Sunday in April to first Sunday in October. No exception for 1950. Here is a list from the Lisbon astronomical observatory, which says the same thing. http://oal.ul.pt/documentos/2018/01/hl1911a2018.pdf/ I suggest that the rules for Europe/Lisbon should be updated accordingly.

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