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Java TZDB compiler
by Marcos Passos Jan. 26, 2019

Jan. 26, 2019

Hello, The Java TZDB compiler models transitions in terms of historical transitions and transition rules. All transition rules start one year after the latest year among the unbounded rules in the TZDB database for a given zone. Reading the docs, I found the following explanation about that extra year: Also add one more year to avoid weird case where penultimate year has odd > offset. Does anyone know what does it mean and in which cases does it occur? - Marcos

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How long will the rearguard formats continue be provided?
by Pramoth Murali Jan. 25, 2019

Jan. 25, 2019

Hello! Our team utilizes a custom version of tzcode and a calendar utility that don't support negative DST offsets that was brought back in 2018e nor the 2018f fallback transactions Japan rules that were at 25:00 hour. We utilized 2018i rearguard-format version and we were able to utilize 2018i with our parsers. The 2018i announcement mentions that the rearguard is intended to be a temporary transition aid; that raises fear if we have to patch one of the upcoming tzdata releases that don't provide a rearguard with similar fixes. While we are planning to work on fixes for our timezone parsers; in order to ensure we have enough leeway for our new solutions, we would be curious to know how long will these rearguard versions (with no negative offsets) continue to be provided?

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[PROPOSED] Put “North” before “Macedonia”
by Paul Eggert Jan. 25, 2019

Jan. 25, 2019

* backzone, europe, iso3166.tab: Put “North” before “Macedonia” in commentary and metadata. Might as well do it now, since the name change appears to be a done deal. This does not affect time data. --- backzone | 2 +- europe | 4 ++-- iso3166.tab | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/backzone b/backzone index 97792b1..c464ce6 100644 --- a/backzone +++ b/backzone @@ -625,7 +625,7 @@ Zone Europe/Sarajevo 1:13:40 - LMT 1884 1:00 - CET 1982 Nov 27 1:00 EU CE%sT -# Macedonia +# North Macedonia Zone Europe/Skopje 1:25:44 - LMT 1884 1:00 - CET 1941 Apr 18 23:00 1:00 C-Eur CE%sT 1945 May 8 2:00s diff --git a/europe b/europe index 587f7b0..b735a48 100644 --- a/europe +++ b/europe @@ -1855,7 +1855,7 @@ Zone Europe/Luxembourg 0:24:36 - LMT 1904 Jun 1:00 Belgium CE%sT 1977 1:00 EU CE%sT -# Macedonia +# North Macedonia # See Europe/Belgrade. # Malta @@ -3359,7 +3359,7 @@ Zone Europe/Belgrade 1:22:00 - LMT 1884 Link Europe/Belgrade Europe/Ljubljana # Slovenia Link Europe/Belgrade Europe/Podgorica # Montenegro Link Europe/Belgrade Europe/Sarajevo # Bosnia and Herzegovina -Link Europe/Belgrade Europe/Skopje # Macedonia +Link Europe/Belgrade Europe/Skopje # North Macedonia Link Europe/Belgrade Europe/Zagreb # Croatia # Slovakia diff --git a/iso3166.tab b/iso3166.tab index c2e0f8e..98fb988 100644 --- a/iso3166.tab +++ b/iso3166.tab @@ -166,7 +166,7 @@ ME Montenegro MF St Martin (French) MG Madagascar MH Marshall Islands -MK Macedonia +MK North Macedonia ML Mali MM Myanmar (Burma) MN Mongolia -- 2.17.1

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Metlakatla
by TechOps Jan. 22, 2019

Jan. 22, 2019

Hello. The Metlakatla community in Alaska has decided not to change its clock back an hour starting on November 4th, 2018 (day before yesterday). They will be gmtoff=-28800 year-round. I'm told this is the list to send this information to. Any assistance or advice on getting this updated in the database is appreciated. https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520… [image: MIC time change.jpg] - Ryan _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ AKTechOps <http://serrc.org/techops> | techops(a)serrc.org | *(907) 523-7290* *| Brian 523-7248 | Michaela 523-7258 | Nate 523-7275 | Nick 523-7291 | Ryan 523-7272 | SERRC 586-6806 |*

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Re: [tz] Bulletin C number 57
by Hal Murray Jan. 20, 2019

Jan. 20, 2019

eggert(a)cs.ucla.edu said: > but I worry that the format change will also mess up downstream programs too > (notably NTP-related) Worked OK for ntpsec. There is a checksum in the file, but it only covers the non-comment digits in the file. (so white space changes are OK) The payload lines must start on column 1 - no leading white space. -- These are my opinions. I hate spam.

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Conrad Maldives Rangali Island resort
by Deborah Goldsmith Jan. 20, 2019

Jan. 20, 2019

Apparently, this resort in the Maldives has its own time zone and observes GMT+06 year round, unlike Male at GMT+05. It looks like we’d need a new zone for this. Source: Internal reports and: http://conradglobalmediacenter.com/assets/CNRD/docs/FactSheets/ConradMaldiv… (search for “Local Time”) I wasn’t able to find any source contradicting this information. Apparently it’s a known issue that Maldives resort islands have their own (unofficial) time zones: https://www.timeanddate.com/time/zone/maldives At the moment, users need to find a time zone that has the same GMT offset (in this case Indian/Chagos works) and use that instead. Thanks, Debbie

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Some rules in tz specification files seem to be applied (by zic) outside of their declared period of applicability
by Parsifal Herzog Jan. 19, 2019

Jan. 19, 2019

In the example shown below, copied from from tzdata2018i Africa file, the last Zone line, referencing the Namibia rule, should start at 1990 March 21 2:00 am. There are no Namibia transitions defined from that start, until 1994. However zic does create a transition using the second Namibia rule at the start time, as shown in the zdump output below. There are many other cases like this, where an UNTIL specification ends well before the next applicable rule of the following zone line. I am trying to read the zic manual page as a specification, and I do not understand why zic inserts that transition. It seems to me that either the last Zone line (SAST) would remain in effect until 1994, as there is no other transition defined, or that period is in an undefined state, as the SAST transition is not in effect after1990 March 21. Can someone correct my understanding? ------- Specification extract # RULE NAME FROM TO TYPE IN ON AT SAVE LETTER/S # Vanguard section, for zic and other parsers that support negative DST. Rule Namibia 1994 only - Mar 21 0:00 -1:00 WAT Rule Namibia 1994 2017 - Sep Sun>=1 2:00 0 CAT Rule Namibia 1995 2017 - Apr Sun>=1 2:00 -1:00 WAT # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Windhoek 1:08:24 - LMT 1892 Feb 8 1:30 - +0130 1903 Mar 2:00 - SAST 1942 Sep 20 2:00 2:00 1:00 SAST 1943 Mar 21 2:00 2:00 - SAST 1990 Mar 21 # independence # Vanguard section, for zic and other parsers that support negative DST. 2:00 Namibia %s ------ Zicdump output: $ zdump -v -c 1892,1996 Africa/Windhoek Africa/Windhoek -9223372036854775808 = NULL Africa/Windhoek -9223372036854689408 = NULL Africa/Windhoek Sun Feb 7 22:51:35 1892 UT = Sun Feb 7 23:59:59 1892 LMT isdst=0 gmtoff=4104 Africa/Windhoek Sun Feb 7 22:51:36 1892 UT = Mon Feb 8 00:21:36 1892 +0130 isdst=0 gmtoff=5400 Africa/Windhoek Sat Feb 28 22:29:59 1903 UT = Sat Feb 28 23:59:59 1903 +0130 isdst=0 gmtoff=5400 Africa/Windhoek Sat Feb 28 22:30:00 1903 UT = Sun Mar 1 00:30:00 1903 SAST isdst=0 gmtoff=7200 Africa/Windhoek Sat Sep 19 23:59:59 1942 UT = Sun Sep 20 01:59:59 1942 SAST isdst=0 gmtoff=7200 Africa/Windhoek Sun Sep 20 00:00:00 1942 UT = Sun Sep 20 03:00:00 1942 SAST isdst=1 gmtoff=10800 Africa/Windhoek Sat Mar 20 22:59:59 1943 UT = Sun Mar 21 01:59:59 1943 SAST isdst=1 gmtoff=10800 Africa/Windhoek Sat Mar 20 23:00:00 1943 UT = Sun Mar 21 01:00:00 1943 SAST isdst=0 gmtoff=7200 Africa/Windhoek Tue Mar 20 21:59:59 1990 UT = Tue Mar 20 23:59:59 1990 SAST isdst=0 gmtoff=7200 Africa/Windhoek Tue Mar 20 22:00:00 1990 UT = Wed Mar 21 00:00:00 1990 CAT isdst=0 gmtoff=7200 <------ zic inserted the 1994 "CAT" transition. How was this chosen? Africa/Windhoek Sun Mar 20 21:59:59 1994 UT = Sun Mar 20 23:59:59 1994 CAT isdst=0 gmtoff=7200 Africa/Windhoek Sun Mar 20 22:00:00 1994 UT = Sun Mar 20 23:00:00 1994 WAT isdst=1 gmtoff=3600 <----- first applicable rule in 1994. Africa/Windhoek Sun Sep 4 00:59:59 1994 UT = Sun Sep 4 01:59:59 1994 WAT isdst=1 gmtoff=3600 Africa/Windhoek Sun Sep 4 01:00:00 1994 UT = Sun Sep 4 03:00:00 1994 CAT isdst=0 gmtoff=7200 Africa/Windhoek Sat Apr 1 23:59:59 1995 UT = Sun Apr 2 01:59:59 1995 CAT isdst=0 gmtoff=7200 Africa/Windhoek Sun Apr 2 00:00:00 1995 UT = Sun Apr 2 01:00:00 1995 WAT isdst=1 gmtoff=3600 Africa/Windhoek Sun Sep 3 00:59:59 1995 UT = Sun Sep 3 01:59:59 1995 WAT isdst=1 gmtoff=3600 Africa/Windhoek Sun Sep 3 01:00:00 1995 UT = Sun Sep 3 03:00:00 1995 CAT isdst=0 gmtoff=7200 Africa/Windhoek 9223372036854689407 = NULL Africa/Windhoek 9223372036854775807 = NULL -------

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Bulletin C number 57
by Chris Woodbury Jan. 19, 2019

Jan. 19, 2019

On Tue Jan 8 01:32:04 UTC 2019, Paul Eggert wrote:> In the meantime perhaps we could forge the NIST leap-seconds.list file > (including a comment that it's a forgery and why we're doing the > forgery), and then substitute the real thing whenever it shows up. I'd > rather have a script to do that than do it by hand, though. We'd need > that script anyway if we start basing our distribution on the IERS file, > as so many users now grab the NIST file from us rather than from the NIST.Your wish is my command.... # -=*( This file is in the public domain )*=- # This NTP leap-second file was created with data obtained from # the United States Naval Observatory (USNO) MAIA FTP server. # # Find it at: <ftp://maia.usno.navy.mil/ser7/leapsec.dat> # Updated using information from IERS Bulletin C 57 (7 Jan 2019) # Found at <ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat> # # This file is not a forgery, per se, but it is created # by some one/thing other than a national metrology lab. # It is necessitated by a current US government shutdown # and the resulting lack of an NIST generated file. # # UTC is a time scale based upon standard international (SI) # seconds and derived from Temps Atomique International (TAI). # # Leap seconds are an official correction to UTC to keep it # within 0.9 seconds of UT1; yet another time standard # based upon the orientation of the earth in space. # # These data, kept in "leap-seconds.list", are used by the # Network Time Protocol daemon (NTPd) to determine when to # apply leap seconds to Coordinated Universal Time (UTC). # "leap-seconds.list" is a symbolic link to the actual # file name, leap-seconds.xxxxxxxxxx, where xxxxxxxxxx # is derived from the NTP update timestamp (below). # # Theoretically, a leap second may be positive or negative. # Realistically, negative leap seconds are unlikely to occur. # # All timestamps in this leap seconds file are encoded using the # NTP epoch. These timestamps represent the number of seconds # since 1 Jan 1900 0:00:00. This is Modified Julian Date (MJD) # 15020 and Julian Date 2415020.5. There will be an unsigned # 32-bit overflow to the second NTP era in 2036 (07 Feb 2036 # 06:28:16 UTC to be precise). # # A leap second datum consists of an NTP timestamp and the # number of seconds difference between TAI and UTC (e.g. # currently TAI-UTC is 37). UTC was established at midnight on # 1 Jan 1972 with TAI-UTC started at 10. There was no mechanism # prior to that time defining when to apply leap seconds. # # Note: the first datum in the leap-seconds.list file is *not* # a leap-second; it denotes the definition of the UTC timescale. # # Leap-seconds rules are establish in: # # International Telecommunications Union-Regulation (ITU-R) # 460-6, Annex 1, Section 2. # # <http://www.itu.int/rec/R-REC-TF.460-6-200202-I/> # # NTP Leap second files have an update time (#$). This is often # the UTC zero (0) hour time of the day when the leap second file # is built. It should be updated whenever a new IERS Bulletin C # is issued. # #$ 3755808000 # # Leap second data have a lifetime. Traditionally, this ends on # the twenty-eighth (28) day of the month six months after the # period of time described in the latest IERS Bulletin C. This # is the expiry time (#@). # #@ 3786480000 # # Leap second files have a hash, as define in NIST's FIPS 180 # Secure Hash Standard (SHS), current revision 4 (FIPS 180-4). # # FIPS Publications: <http://csrc.nist.gov/publications/fips/> # Direct Link: <http://dx.doi.org/10.6028/NIST.FIPS.180-4> # # It is based on an SHA[1] digest, created using the data # portions of the file including leap second data and the update # and expiry timestamps. All "white space" and comments are # excluded in the computation thereof. The 160-bit SHA[1] # digest polynomial are encoded in five hexadecimal grouping at # the end of the file (#h). The hash itself is NOT included in # the SHA[1]. It can also be calculated using GNU sha1sum which # generates the same 160-bit digest, given the same data, in # forty hexadecimal characters. # # NTP delta #timestamp T sign Date of Change 2272060800 10 # + : 1 Jan 1972 (MJD 41317) 2287785600 11 # + : 1 Jul 1972 (MJD 41499) 2303683200 12 # + : 1 Jan 1973 (MJD 41683) 2335219200 13 # + : 1 Jan 1974 (MJD 42048) 2366755200 14 # + : 1 Jan 1975 (MJD 42413) 2398291200 15 # + : 1 Jan 1976 (MJD 42778) 2429913600 16 # + : 1 Jan 1977 (MJD 43144) 2461449600 17 # + : 1 Jan 1978 (MJD 43509) 2492985600 18 # + : 1 Jan 1979 (MJD 43874) 2524521600 19 # + : 1 Jan 1980 (MJD 44239) 2571782400 20 # + : 1 Jul 1981 (MJD 44786) 2603318400 21 # + : 1 Jul 1982 (MJD 45151) 2634854400 22 # + : 1 Jul 1983 (MJD 45516) 2698012800 23 # + : 1 Jul 1985 (MJD 46247) 2776982400 24 # + : 1 Jan 1988 (MJD 47161) 2840140800 25 # + : 1 Jan 1990 (MJD 47892) 2871676800 26 # + : 1 Jan 1991 (MJD 48257) 2918937600 27 # + : 1 Jul 1992 (MJD 48804) 2950473600 28 # + : 1 Jul 1993 (MJD 49169) 2982009600 29 # + : 1 Jul 1994 (MJD 49534) 3029443200 30 # + : 1 Jan 1996 (MJD 50083) 3076704000 31 # + : 1 Jul 1997 (MJD 50630) 3124137600 32 # + : 1 Jan 1999 (MJD 51179) 3345062400 33 # + : 1 Jan 2006 (MJD 53736) 3439756800 34 # + : 1 Jan 2009 (MJD 54832) 3550089600 35 # + : 1 Jul 2012 (MJD 56109) 3644697600 36 # + : 1 Jul 2015 (MJD 57204) 3692217600 37 # + : 1 Jan 2017 (MJD 57754) # #h ffee5390 2e3cf253 e15b646e 01768a18 e83785c3

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Bulletin C number 57
by Chris Woodbury Jan. 17, 2019

Jan. 17, 2019

On Tue Jan 8 01:32:04 UTC 2019 Paul Eggert <eggert(a)cs.ucla.edu> wrote: > In the meantime perhaps we could forge the NIST leap-seconds.list file > (including a comment that it's a forgery and why we're doing the > forgery), and then substitute the real thing whenever it shows up. I'd > rather have a script to do that than do it by hand, though. We'd need > that script anyway if we start basing our distribution on the IERS file, > as so many users now grab the NIST file from us rather than from the NIST. Your wish is my command. See attachment.

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Brasil DST changes
by Dedeco Balaco Jan. 15, 2019

Jan. 15, 2019

Hello, last year, the DST automatic adjust for my recently installed system was wrong. It is a Debian 9 install. I adjusted it manually in the start and end or the period. It was not done according to what was defined by our State sometime before. Please note that it was not something done close to the change date. My friends and I looked around a bit, and we found that this change should have passed here somehow. Next year, I do not know how it will be. Who is responsible for this kind of information or update?

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