January 2024 - tz - lists.iana.org

(no subject)
by Cool Gab19 Nov. 7, 2024

Nov. 7, 2024

can you add Philippine Daylight Time on your Database I think it was missing from the list of the time zones please reply immediately if solved thanks...

4 8

Re: [tz] Time for a Lunar time zone? -Brooks
by Paul Eggert July 11, 2024

July 11, 2024

On 3/2/23 09:51, Brooks Harris wrote: > Will we need DST on the Moon? :-) I hope not! The Moon's axis tilts only 1.5°, much less than the 23.5° of Earth's axis, so seasonal effects on sunlight duration are much less intense on the Moon and there should be less need for Earth-like DST. A more pressing issue is that the length of day (including daytime and nighttime) varies more on the Moon. Local Earth days vary by at most 0.008 hours from the mean of 24 hours (this variation is due to the eccentricity of the Earth orbit and the obliquity of the ecliptic). So people who think that every local Earth day is exactly 24 hours are not far off. Local lunar days, in contrast, are roughly 29.5 ± 0.25 Earth days (again, this includes both lunar daytime and lunar nighttime). That's more slop to deal with, relatively speaking, and dealing with varying-length days could be a bit of a problem for civil time on the Moon. Presumably ESA's boffins are on top of this.....

4 5

Kazakhstan to shift from UTC+6 to UTC+5
by Dauren Sarsenov Feb. 4, 2024

Feb. 4, 2024

Hello, all. There is an upcoming timezone change I want to inform you about. In Kazakhstan we are moving away from UTC+6 to UTC+5 across all areas of the country. The change is effective at 00:00 1 march 2024. The clock will shift 1 hour back. After the change, only the UTC+5 timezone will remain in the country. I have linked the official statement (no Eng version of the statement though) and some links to news articles: 1) KAZ: https://www.gov.kz/memleket/entities/mti/press/news/details/688998?lang=kk 2) RUS: https://www.gov.kz/memleket/entities/mti/press/news/details/688998?lang=ru 3) KAZ: http://law.gov.kz/client/#!/doc/192700/kaz 4) RUS: http://law.gov.kz/client/#!/doc/192700/rus 5) ENG: https://daryo.uz/en/2024/01/21/kazakhstan-set-to-shift-to-utc5-time-zone-on… 6) ENG: https://qazmonitor.com/news/2430/kazakhstan-to-change-the-clocks-to-single-… The news broke 19th of january, hence informing you at the short notice. Best regards Dauren Sarsenov

5 10

Extending winter time in Palestine
by heba.hamad Feb. 3, 2024

Feb. 3, 2024

3 3

RFC 8536bis
by Michael H Deckers Feb. 2, 2024

Feb. 2, 2024

In 2014b, the new tzdb timezone for Antarctica/Troll required regular switches among three offsets for the foreseeable future. This led to an extension of the TZif format so that the footer could contain two TZ strings (or so I thought); the timezone Antarctica/Troll, hwever, was modified so as to not yet require the new TZif feature. Now it appears that the latest specification "RFC 8536bis" of the TZif format does not allow for two TZ strings in the footer (or at least I did not detect it). Does that mean that the feature "two TZ strings" in a TZif file is further postponed, or is it dropped for good? Michael Deckers.

3 9

Kazakhstan timezone switch from 01.03.2024
by Yegor Fyodorov Feb. 1, 2024

Feb. 1, 2024

Dear sirs, I want to notify you that Kazakstan's government made a decision to switch timezone for the whole country to one timezone only: UTC+5. Right now there are 2 timezones: UTC+5 and UTC+6. The switch is going to happen on 1st march 2024. As far as I can see this change is not implemented in 2023d version of timezone database. Is it possible to add this change? Kazakstan is a big country, so a lot of users will be affected. And there is only 1 month left to implement this change. Some links for the news. Unfortunatelly official news are only in Russian / Kazakh language, but you can use google translate. Kazakhstan will switch to a single time zone, UTC+05:00, on March 1, 2024: https://en.wikipedia.org/wiki/Time_in_Kazakhstan According to Ministry of Trade and Integration of the Republic of Kazakhstan website: https://www.gov.kz/memleket/entities/mti/press/news/details/688998?lang=ru -- Best regards, Yegor Fyodorov

2 1

ipr check: draft-murchison-rfc8536bis
by Eliot Lear Jan. 31, 2024

Jan. 31, 2024

Authors, Please confirm that you are not aware of any IPR associated with draft-murchison-rfc8536bis, and that you are all willing to be listed as authors. Thanks, Eliot (acting as document shepherd)

3 2

Expanding the section on the Czech Republic and Slovakia
by Ivan Benovic Jan. 30, 2024

Jan. 30, 2024

Hello, My name is Ivan Benovic, I am a native of Slovakia (former Czechoslovakia) and would like to propose several additions to the section on the Czech Republic and Slovakia. First of all, I suggest adding links to two documents: – https://www.slov-lex.sk/pravne-predpisy/SK/ZZ/1946/54/ (This is an official link to the Czechoslovak Summer Time Act of March 8, 1946 that authorizes the Czechoslovak government to set the exact dates of change to summer time and back to Central European Time. The act also implicitly confirms Central European Time as the official time zone of Czechoslovakia and currently remains in force in both the Czech Republic and Slovakia.) – https://www.psp.cz/eknih/1945pns/tisky/t0216_00.htm (This is a link to the original legislative proposal dating back to February 22, 1946. The accompanying memorandum to the proposal says that an advisory committee on European railroad transportation that met in Brussels in October 1945 decided that the change of time should be carried out in all participating countries in a strictly coordinated manner. To that end and in order to make setting the dates of summer time and standard time in Czechoslovakia more flexible, the act authorized the government to set them without parliamentary approval.) Second, I suggest expanding the Rules section. The link https://kalendar.beda.cz/kdy-zacina-a-konci-letni-cas, which is already included in the section, containts the following information that is not yet explicitly included in the rules: Year 1916: According to the excerpt from a contemporary newspaper article, in 1916 summer time started in the Czech lands (part of the then Austria-Hungary) on April 30 at 23:00 (the clock was shifted to May 1, 0:00) and lasted until October 1 at 1:00 (when the clock was shifted back to 0:00). The corresponding rule should thus look as follows: #RuleNAMEFROMTO-INONATSAVELETTER/S RuleCzech1916only-Apr3023:001:00S RuleCzech1916only-Oct11:000- Year 1917: According to the excerpt from another contemporary newspaper article, in 1917 summer time started in the Czech lands on April 16 and ended on September 17, but no exact times are given, so I guess we can’t add any rule. Year 1918: According to the excerpt from a third contemporary newspaper article on the webpage, in 1918 summer time started in the Czech lands (still part of the then Austria-Hungary) on April 15 at 1:00 (the clock was shifted to 2:00) and lasted until September 16 at 2:00 when the clock was shifted back to 1:00. The corresponding rule should thus look as follows: #RuleNAMEFROMTO-INONATSAVELETTER/S RuleCzech1918only-Apr151:001:00S RuleCzech1918only-Sep161:00 0- Afterward, unlike France and the United Kingdom, the First Czechoslovak Republic decided not to adopt summer time in the interwar period due to public opposition. Year 1940: Just like the excerpt mentioning 1917, the corresponding excerpt for 1940 doesn’t contain any exact times of the change either, so I guess I can’t suggest adding any rule, but it says that summer time started on April 1 and ended on October 6 of that year. Should you have any questions or need any clarifications, feel free to contact me. All the best, Ivan Benovic +421 910 557 4114 (WhatsApp/Signal) ivan.benovic(a)protonmail.com www.linkedin.com/in/benovic

2 1

Re: [tz] [PROPOSED] Document POSIX versions more carefully
by Paul Eggert Jan. 28, 2024

Jan. 28, 2024

On 2024-01-28 07:23, Paul Gilmartin wrote: > Is a draft of that next POSIX publicly available? You can get a copy by signing up as per the News section of: https://www.opengroup.org/austin/ > One significant(?) > UNIX-branded implementation supports only “POSIX.1-2017-like TZ strings”: > <https://www.ibm.com/docs/en/zos/3.1.0?topic=variable-command-format> Thanks, I wasn't aware that z/OS supports only POSIX.1-2017 syntax for TZ strings. This behavior was common in older platforms, and I assume can happen even today in stripped-down platforms other than z/OS. As a transition aid for these systems, it's helpful to have a mapping from TZDB settings like TZ='Europe/London' to POSIX.1-2017 approximations like TZ='GMT0BST,M3.5.0/1,M10.5.0'. Perhaps TZDB itself should support such a mapping, though now's not the best time to add that as we're so close to a release. In the meantime I installed the attached documentation patch, which references the posix_tz_db package that generates mapping tables.

2 1

[PROPOSED] Document POSIX versions more carefully
by Paul Eggert Jan. 28, 2024

Jan. 28, 2024

Since the next POSIX will require support for TZDB Zone names in the TZ environment variable, be more careful about phrases like “POSIX-like TZ strings” in comments and documentation. Call them “POSIX.1-2017-like TZ strings” instead, to make it clearer that they’re the traditional POSIX form like TZ='GMT0BST,M3.5.0/1,M10.5.0' instead of the TZDB form like TZ='Europe/London'. --- Makefile | 19 ++++++++++--------- etcetera | 2 +- localtime.c | 16 +++++++++------- newstrftime.3 | 4 ++-- newtzset.3 | 4 ++-- private.h | 2 +- theory.html | 30 +++++++++++++++--------------- tz-link.html | 2 +- tzfile.5 | 28 +++++++++++++++------------- tzfile.h | 6 +++--- tzselect.ksh | 6 +++--- zic.8 | 10 +++++----- zic.c | 9 +++++---- 13 files changed, 72 insertions(+), 66 deletions(-) diff --git a/Makefile b/Makefile index 97a17314..d48354c7 100644 --- a/Makefile +++ b/Makefile @@ -53,7 +53,7 @@ DATAFORM= main LOCALTIME= Factory -# The POSIXRULES macro controls interpretation of POSIX-like TZ +# The POSIXRULES macro controls interpretation of POSIX-2017.1-like TZ # settings like TZ='EET-2EEST' that lack DST transition rules. # If POSIXRULES is '-', no template is installed; this is the default. # Any other value for POSIXRULES is obsolete and should not be relied on, as: @@ -274,7 +274,7 @@ LDLIBS= # -DTZ_DOMAINDIR=\"/path\" to use "/path" for gettext directory; # the default is system-supplied, typically "/usr/lib/locale" # -DTZDEFRULESTRING=\",date/time,date/time\" to default to the specified -# DST transitions for POSIX-style TZ strings lacking them, +# DST transitions for POSIX.1-2017-style TZ strings lacking them, # in the usual case where POSIXRULES is '-'. If not specified, # TZDEFRULESTRING defaults to US rules for future DST transitions. # This mishandles some past timestamps, as US DST rules have changed. @@ -340,9 +340,10 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # guess TM_GMTOFF from other macros; define NO_TM_GMTOFF to suppress this. # Similarly, if your system has a "zone abbreviation" field, define # -DTM_ZONE=tm_zone -# and define NO_TM_ZONE to suppress any guessing. Although these two fields -# not required by POSIX, a future version of POSIX is planned to require them -# and they are widely available on GNU/Linux and BSD systems. +# and define NO_TM_ZONE to suppress any guessing. +# Although these two fields are not required by POSIX.1-2017, +# POSIX 202x/D4 requires them and they are widely available +# on GNU/Linux and BSD systems. # # The next batch of options control support for external variables # exported by tzcode. In practice these variables are less useful @@ -352,7 +353,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # # -DHAVE_TZNAME=0 # do not support "tzname" # # -DHAVE_TZNAME=1 # support "tzname", which is defined by system library # # -DHAVE_TZNAME=2 # support and define "tzname" -# # to the "CFLAGS=" line. "tzname" is required by POSIX 1988 and later. +# # to the "CFLAGS=" line. "tzname" is required by POSIX.1-1988 and later. # # If not defined, the code attempts to guess HAVE_TZNAME from other macros. # # Warning: unless time_tz is also defined, HAVE_TZNAME=1 can cause # # crashes when combined with some platforms' standard libraries, @@ -362,8 +363,8 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # # -DUSG_COMPAT=0 # do not support # # -DUSG_COMPAT=1 # support, and variables are defined by system library # # -DUSG_COMPAT=2 # support and define variables -# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by -# # Unix Systems Group code and are required by POSIX 2008 (with XSI) and later. +# # to the "CFLAGS=" line; "timezone" and "daylight" are inspired by Unix +# # Systems Group code and are required by POSIX.1-2008 and later (with XSI). # # If not defined, the code attempts to guess USG_COMPAT from other macros. # # # # To support the external variable "altzone", add @@ -427,7 +428,7 @@ GCC_DEBUG_FLAGS = -DGCC_LINT -g3 -O3 -fno-common \ # The name of a POSIX-like library archiver, its flags, C compiler, # linker flags, and 'make' utility. Ordinarily the defaults suffice. -# The commented-out values are the defaults specified by POSIX 202x/D3. +# The commented-out values are the defaults specified by POSIX.1-202x/D4. #AR = ar #ARFLAGS = -rv #CC = c17 diff --git a/etcetera b/etcetera index 865a220c..29fbed9b 100644 --- a/etcetera +++ b/etcetera @@ -5,7 +5,7 @@ # These entries are for uses not otherwise covered by the tz database. # Their main practical use is for platforms like Android that lack -# support for POSIX-style TZ strings. On such platforms these entries +# support for POSIX.1-2017-style TZ strings. On such platforms these entries # can be useful if the timezone database is wrong or if a ship or # aircraft at sea is not in a timezone. diff --git a/localtime.c b/localtime.c index 7613769f..02cc5ee5 100644 --- a/localtime.c +++ b/localtime.c @@ -7,7 +7,7 @@ /* ** Leap second handling from Bradley White. -** POSIX-style TZ environment variable handling from Guy Harris. +** POSIX.1-1988 style TZ environment variable handling from Guy Harris. */ /*LINTLIBRARY*/ @@ -106,7 +106,7 @@ static char const UNSPEC[] = "-00"; for ttunspecified to work without crashing. */ enum { CHARS_EXTRA = max(sizeof UNSPEC, 2) - 1 }; -/* Limit to time zone abbreviation length in POSIX-style TZ strings. +/* Limit to time zone abbreviation length in POSIX.1-2017-style TZ strings. This is distinct from TZ_MAX_CHARS, which limits TZif file contents. */ #ifndef TZNAME_MAXIMUM # define TZNAME_MAXIMUM 255 @@ -935,7 +935,8 @@ getoffset(register const char *strp, int_fast32_t *const offsetp) /* ** Given a pointer into a timezone string, extract a rule in the form -** date[/time]. See POSIX section 8 for the format of "date" and "time". +** date[/time]. See POSIX Base Definitions section 8.3 variable TZ +# for the format of "date" and "time". ** If a valid rule is not found, return NULL. ** Otherwise, return a pointer to the first character not part of the rule. */ @@ -1079,7 +1080,7 @@ transtime(const int year, register const struct rule *const rulep, } /* -** Given a POSIX section 8-style TZ string, fill in the rule tables as +** Given a POSIX.1-2017-style TZ string, fill in the rule tables as ** appropriate. */ @@ -1312,8 +1313,8 @@ tzparse(const char *name, struct state *sp, struct state const *basep) /* ** Transitions from DST to DDST ** will effectively disappear since - ** POSIX provides for only one DST - ** offset. + ** POSIX.1-2017 provides for only one + ** DST offset. */ if (isdst && !sp->ttis[j].tt_ttisstd) { sp->ats[i] += dstoffset - @@ -1483,7 +1484,8 @@ tzfree(timezone_t sp) ** ** If successful and SETNAME is nonzero, ** set the applicable parts of tzname, timezone and altzone; -** however, it's OK to omit this step if the timezone is POSIX-compatible, +** however, it's OK to omit this step +** if the timezone is compatible with POSIX.1-2017 ** since in that case tzset should have already done this step correctly. ** SETNAME's type is int_fast32_t for compatibility with gmtsub, ** but it is actually a boolean and its value should be 0 or 1. diff --git a/newstrftime.3 b/newstrftime.3 index 9fc68471..704318ea 100644 --- a/newstrftime.3 +++ b/newstrftime.3 @@ -91,11 +91,11 @@ as specified by brackets in the description. If a bracketed member name is followed by .q + , .B strftime -can use the named member even though POSIX-2017 does not list it; +can use the named member even though POSIX.1-2017 does not list it; if the name is followed by .q \*- , .B strftime -ignores the member even though POSIX-2017 lists it +ignores the member even though POSIX.1-2017 lists it which means portable code should set it. For portability, .BI * timeptr diff --git a/newtzset.3 b/newtzset.3 index 5d973749..b1384f32 100644 --- a/newtzset.3 +++ b/newtzset.3 @@ -216,7 +216,7 @@ except that POSIX.1-2017 does not allow a leading sign (\c .q "\*-" or .q "+" ). -As an extension to POSIX-1.2017, the hours part of +As an extension to POSIX.1-2017, the hours part of .I time can range from \-167 through 167; this allows for unusual rules such as @@ -230,7 +230,7 @@ is not given, is Here are some examples of .I TZ values that directly specify the timezone; they use some of the -extensions to POSIX-1.2017. +extensions to POSIX.1-2017. .TP .B EST5 stands for US Eastern Standard diff --git a/private.h b/private.h index b3d563d5..0dac6af4 100644 --- a/private.h +++ b/private.h @@ -973,7 +973,7 @@ enum { /* How many years to generate (in zic.c) or search through (in localtime.c). This is two years larger than the obvious 400, to avoid edge cases. - E.g., suppose a non-POSIX rule applies from 2012 on and has transitions + E.g., suppose a non-POSIX.1-2017 rule applies from 2012 on with transitions in March and September, plus one-off transitions in November 2013. If zic looked only at the last 400 years, it would set max_year=2413, with the intent that the 400 years 2014 through 2413 will be repeated. diff --git a/theory.html b/theory.html index 0fb8d66a..318b6c25 100644 --- a/theory.html +++ b/theory.html @@ -95,7 +95,7 @@ Group Base Specifications Issue 7</a>, IEEE Std 1003.1-2017, 2018 Edition. Because the database's scope encompasses real-world changes to civil timekeeping, its model for describing time is more complex than the -standard and daylight saving times supported by POSIX. +standard and daylight saving times supported by POSIX.1-2017. A <code><abbr>tz</abbr></code> timezone corresponds to a ruleset that can have more than two changes per year, these changes need not merely flip back and forth between two alternatives, and the rules themselves @@ -187,7 +187,7 @@ in decreasing order of importance: href="https://en.wikipedia.org/wiki/ASCII">ASCII</a> letters, '<code>.</code>', '<code>-</code>' and '<code>_</code>'. Do not use digits, as that might create an ambiguity with <a - href="https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#ta…">POSIX + href="https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#ta…">POSIX.1-2017 <code>TZ</code> strings</a>. A file name component must not exceed 14 characters or start with '<code>-</code>'. @@ -378,7 +378,7 @@ nowadays distributions typically use it and no great weight should be attached to whether a link is defined in <code>backward</code> or in some other file. The source file <code>etcetera</code> defines names that may be useful -on platforms that do not support POSIX-style <code>TZ</code> strings; +on platforms that do not support POSIX.1-2017-style <code>TZ</code> strings; no other source file other than <code>backward</code> contains links to its zones. One of <code>etcetera</code>'s names is <code>Etc/UTC</code>, @@ -426,7 +426,7 @@ in decreasing order of importance: expression <code>[-+[:alnum:]]{3,6}</code> should match the abbreviation. This guarantees that all abbreviations could have been specified by a - POSIX <code>TZ</code> string. + POSIX.1-2017 <code>TZ</code> string. </p> </li> <li> @@ -775,7 +775,7 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes the Western 06:00 to be 12:00. These practices are largely outside the scope of the <code><abbr>tz</abbr></code> code and data, which provide only limited support for date and time localization - such as that required by POSIX. + such as that required by POSIX.1-2017. If <abbr>DST</abbr> is not used a different time zone can often do the trick; for example, in Kenya a <code>TZ</code> setting like <code><-03>3</code> or <code>America/Cayenne</code> starts @@ -872,23 +872,23 @@ input is occasionally extended, and a platform may still be shipping an older <code>zic</code>. </p> -<h3 id="POSIX">POSIX properties and limitations</h3> +<h3 id="POSIX">POSIX.1-2017 properties and limitations</h3> <ul> <li> <p> - In POSIX, time display in a process is controlled by the + In POSIX.1-2017, time display in a process is controlled by the environment variable <code>TZ</code>. - Unfortunately, the POSIX + Unfortunately, the POSIX.1-2017 <code>TZ</code> string takes a form that is hard to describe and is error-prone in practice. - Also, POSIX <code>TZ</code> strings cannot deal with daylight + Also, POSIX.1-2017 <code>TZ</code> strings cannot deal with daylight saving time rules not based on the Gregorian calendar (as in Morocco), or with situations where more than two time zone abbreviations or <abbr>UT</abbr> offsets are used in an area. </p> <p> - The POSIX <code>TZ</code> string takes the following form: + The POSIX.1-2017 <code>TZ</code> string takes the following form: </p> <p> @@ -955,7 +955,7 @@ an older <code>zic</code>. </dl> <p> - Here is an example POSIX <code>TZ</code> string for New + Here is an example POSIX.1-2017 <code>TZ</code> string for New Zealand after 2007. It says that standard time (<abbr>NZST</abbr>) is 12 hours ahead of <abbr>UT</abbr>, and that daylight saving time @@ -966,7 +966,7 @@ an older <code>zic</code>. <pre><code>TZ='NZST-12NZDT,M9.5.0,M4.1.0/3'</code></pre> <p> - This POSIX <code>TZ</code> string is hard to remember, and + This POSIX.1-2017 <code>TZ</code> string is hard to remember, and mishandles some timestamps before 2008. With this package you can use this instead: </p> @@ -1004,7 +1004,7 @@ an older <code>zic</code>. limit phone calls to off-peak hours. </li> <li> - POSIX provides no convenient and efficient way to determine + POSIX.1-2017 provides no convenient and efficient way to determine the <abbr>UT</abbr> offset and time zone abbreviation of arbitrary timestamps, particularly for timezones that do not fit into the POSIX model. @@ -1031,14 +1031,14 @@ an older <code>zic</code>. </li> </ul> -<h3 id="POSIX-extensions">Extensions to POSIX in the +<h3 id="POSIX-extensions">Extensions to POSIX.1-2017 in the <code><abbr>tz</abbr></code> code</h3> <ul> <li> <p> The <code>TZ</code> environment variable is used in generating the name of a file from which time-related information is read - (or is interpreted à la POSIX); <code>TZ</code> is no longer + (or is interpreted à la POSIX.1-2017); <code>TZ</code> is no longer constrained to be a string containing abbreviations and numeric data as described <a href="#POSIX">above</a>. The file's format is <dfn><abbr>TZif</abbr></dfn>, diff --git a/tz-link.html b/tz-link.html index 5840f48f..c6181d92 100644 --- a/tz-link.html +++ b/tz-link.html @@ -114,7 +114,7 @@ Indiana, which switched from central to eastern time in 1991 and switched back in 2006. To use the database on an extended <a href="https://en.wikipedia.org/wiki/POSIX"><abbr -title="Portable Operating System Interface">POSIX</abbr></a> +title="Portable Operating System Interface">POSIX</abbr>.1-2017</a> implementation set the <code><abbr>TZ</abbr></code> environment variable to the location's full name, e.g., <code><abbr>TZ</abbr>="America/New_York"</code>.</p> diff --git a/tzfile.5 b/tzfile.5 index 55280282..867348d6 100644 --- a/tzfile.5 +++ b/tzfile.5 @@ -85,7 +85,7 @@ described in the file is associated with the time period starting with the same-indexed transition time and continuing up to but not including the next transition time. (The last time type is present only for consistency checking with the -POSIX-style TZ string described below.) +POSIX.1-2017-style TZ string described below.) These values serve as indices into the next field. .IP \(bu .B tzh_typecnt @@ -186,7 +186,8 @@ must also be set. .PP The standard/wall and UT/local indicators were designed for transforming a TZif file's transition times into transitions appropriate -for another time zone specified via a POSIX-style TZ string that lacks rules. +for another time zone specified via +a POSIX.1-2017-style TZ string that lacks rules. For example, when TZ="EET\*-2EEST" and there is no TZif file "EET\*-2EEST", the idea was to adapt the transition times from a TZif file with the well-known name "posixrules" that is present only for this purpose and @@ -215,13 +216,14 @@ the above header and data are followed by a second header and data, identical in format except that eight bytes are used for each transition time or leap second time. (Leap second counts remain four bytes.) -After the second header and data comes a newline-enclosed, -POSIX-TZ-environment-variable-style string for use in handling instants +After the second header and data comes a newline-enclosed string +in the style of the contents of a POSIX.1-2017 TZ environment variable, +for use in handling instants after the last transition time stored in the file or for all instants if the file has no transitions. -The POSIX-style TZ string is empty (i.e., nothing between the newlines) -if there is no POSIX-style representation for such instants. -If nonempty, the POSIX-style TZ string must agree with the local time +The TZ string is empty (i.e., nothing between the newlines) +if there is no POSIX.1-2017-style representation for such instants. +If nonempty, the TZ string must agree with the local time type after the last transition time if present in the eight-byte data; for example, given the string .q "WET0WEST,M3.5.0/1,M10.5.0" @@ -233,8 +235,8 @@ Also, if there is at least one transition, time type 0 is associated with the time period from the indefinite past up to but not including the earliest transition time. .SS Version 3 format -For version-3-format timezone files, the POSIX-TZ-style string may -use two minor extensions to the POSIX TZ format, as described in +For version-3-format timezone files, the TZ string may +use two minor extensions to the POSIX.1-2017 TZ format, as described in .BR newtzset (3). First, the hours part of its transition times may be signed and range from \-167 through 167 instead of the POSIX-required unsigned values @@ -352,7 +354,7 @@ version 2+ data even if the reader's native timestamps have only .IP \(bu Some readers designed for version 2 might mishandle timestamps after a version 3 or higher file's last transition, because -they cannot parse extensions to POSIX in the TZ-like string. +they cannot parse extensions to POSIX.1-2017 in the TZ-like string. As a partial workaround, a writer can output more transitions than necessary, so that only far-future timestamps are mishandled by version 2 readers. @@ -403,7 +405,7 @@ Some readers mishandle a transition if its timestamp has the minimum possible signed 64-bit value. Timestamps less than \-2**59 are not recommended. .IP \(bu -Some readers mishandle POSIX-style TZ strings that +Some readers mishandle TZ strings that contain .q "<" or @@ -431,12 +433,12 @@ Some readers mishandle TZif files that specify daylight-saving time UT offsets that are less than the UT offsets for the corresponding standard time. These readers do not support locations like Ireland, which -uses the equivalent of the POSIX TZ string +uses the equivalent of the TZ string .q "IST\*-1GMT0,M10.5.0,M3.5.0/1", observing standard time (IST, +01) in summer and daylight saving time (GMT, +00) in winter. As a partial workaround, a writer can output data for the -equivalent of the POSIX TZ string +equivalent of the TZ string .q "GMT0IST,M3.5.0/1,M10.5.0", thus swapping standard and daylight saving time. Although this workaround misidentifies which part of the year diff --git a/tzfile.h b/tzfile.h index 21ae37c1..3155010e 100644 --- a/tzfile.h +++ b/tzfile.h @@ -78,11 +78,11 @@ struct tzhead { ** time uses 8 rather than 4 chars, ** then a POSIX-TZ-environment-variable-style string for use in handling ** instants after the last transition time stored in the file -** (with nothing between the newlines if there is no POSIX representation for -** such instants). +** (with nothing between the newlines if there is no POSIX.1-2017 +** representation for such instants). ** ** If tz_version is '3' or greater, the above is extended as follows. -** First, the POSIX TZ string's hour offset may range from -167 +** First, the TZ string's hour offset may range from -167 ** through 167 as compared to the POSIX-required 0 through 24. ** Second, its DST start time may be January 1 at 00:00 and its stop ** time December 31 at 24:00 plus the difference between DST and diff --git a/tzselect.ksh b/tzselect.ksh index c56bc822..38941bbc 100644 --- a/tzselect.ksh +++ b/tzselect.ksh @@ -438,7 +438,7 @@ while eval ' doselect '"$quoted_continents"' \ "coord - I want to use geographical coordinates." \ - "TZ - I want to specify the timezone using the POSIX TZ format." \ + "TZ - I want to specify the timezone using a POSIX.1-2017 TZ string." \ "time - I know local time already." \ "now - Like \"time\", but configure only for timestamps from now on." continent=$select_result @@ -462,7 +462,7 @@ while case $continent in TZ) - # Ask the user for a POSIX TZ string. Check that it conforms. + # Ask the user for a POSIX.1-2017 TZ string. Check that it conforms. check_POSIX_TZ_string=' BEGIN { tz = substr(ARGV[1], 2) @@ -492,7 +492,7 @@ while read tz $AWK "$check_POSIX_TZ_string" ="$tz" do - say >&2 "'$tz' is not a conforming POSIX timezone string." + say >&2 "'$tz' is not a conforming POSIX.1-2017 timezone string." done TZ_for_date=$tz;; *) diff --git a/zic.8 b/zic.8 index 2f274d7b..0ad373a2 100644 --- a/zic.8 +++ b/zic.8 @@ -171,7 +171,7 @@ boundaries, particularly if causes a TZif file to contain explicit entries for .RI pre- hi transitions rather than concisely representing them -with an extended POSIX TZ string. +with an extended POSIX.1-2017 TZ string. Also see the .B "\*-b slim" option for another way to shrink output size. @@ -181,10 +181,10 @@ Generate redundant trailing explicit transitions for timestamps that occur less than .I hi seconds since the Epoch, even though the transitions could be -more concisely represented via the extended POSIX TZ string. +more concisely represented via the extended POSIX.1-2017 TZ string. This option does not affect the represented timestamps. Although it accommodates nonstandard TZif readers -that ignore the extended POSIX TZ string, +that ignore the extended POSIX.1-2017 TZ string, it increases the size of the altered output files. .TP .BI "\*-t " file @@ -245,10 +245,10 @@ for .PP The output file does not contain all the information about the long-term future of a timezone, because the future cannot be summarized as -an extended POSIX TZ string. For example, as of 2023 this problem +an extended POSIX.1-2017 TZ string. For example, as of 2023 this problem occurs for Morocco's daylight-saving rules, as these rules are based on predictions for when Ramadan will be observed, something that -an extended POSIX TZ string cannot represent. +an extended POSIX.1-2017 TZ string cannot represent. .PP The output contains data that may not be handled properly by client code designed for older diff --git a/zic.c b/zic.c index 70e8f0c7..00f00e30 100644 --- a/zic.c +++ b/zic.c @@ -2982,7 +2982,7 @@ rule_cmp(struct rule const *a, struct rule const *b) return a->r_dayofmonth - b->r_dayofmonth; } -/* Store into RESULT a POSIX TZ string that represent the future +/* Store into RESULT a POSIX.1-2017 TZ string that represent the future predictions for the zone ZPFIRST with ZONECOUNT entries. Return a compatibility indicator (a TZDB release year) if successful, a negative integer if no such TZ string exissts. */ @@ -3177,7 +3177,8 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) if (noise) { if (!*envvar) warning("%s %s", - _("no POSIX environment variable for zone"), + _("no POSIX.1-2017 environment variable" + " for zone"), zpfirst->z_name); else if (compat != 0) { /* Circa-COMPAT clients, and earlier clients, might @@ -3440,8 +3441,8 @@ outzone(const struct zone *zpfirst, ptrdiff_t zonecount) } if (do_extend) { /* - ** If we're extending the explicitly listed observations - ** for 400 years because we can't fill the POSIX-TZ field, + ** If we're extending the explicitly listed observations for + ** 400 years because we can't fill the POSIX.1-2017 TZ field, ** check whether we actually ended up explicitly listing ** observations through that period. If there aren't any ** near the end of the 400-year period, add a redundant -- 2.40.1

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