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Time zones in the arts
by Arthur David Olson March 11, 2016

March 11, 2016

(I'll forego any comment about the absence of an Oxford comma.) @dashdashado 1.1 531 lines 1.2 538 lines *** /tmp/,atz-art.htm 2016-03-11 09:52:55.639707700 -0500 --- /tmp/,btz-art.htm 2016-03-11 09:52:55.715712200 -0500 *************** *** 451,456 **** --- 451,463 ---- proceeds as though it's also mid-evening there.) </li> </ul> + <li> + In the "14 Days to Go"/"T Minus..." episode of "You, Me and the Apocalypse" + (first aired 2015-11-11 in the UK, 2016-03-10 in the US), + the success of a mission to deal with a comet + hinges on whether or not Russia observes Daylight Saving Time. + (In the US, the episode first aired in the week before the switch to DST.) + </li> <hr> <ul> <li>

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[PATCH 0/5] Standardize zone table comments format
by J William Piggott March 10, 2016

March 10, 2016

Not having a standard format for zone table comments is creating ambiguity. For example: 1 Thule / Pituffik 2 Pohnpei (Ponape) 3 Nova Scotia (peninsula) 4 peninsular Malaysia 5 Eastern Time - Pangnirtung, Nunavut 6 Central Time - Campeche, Yucatán 1 and 2 are different formats for alternate names/spellings. 3 shows a sub-region, but uses the same format as the previous alternate name. 4 places the sub-region before the region, where 3 has it after and uses a different format. 5 and 6 use the same format, but 5 defines a single sub-region while 6 defines two regions. These ambiguities make it impossible to interpret the comments without having prior knowledge of the area. This patch set is an effort to standardize the column 4 comments format as follows: A dash (-) is consistently used to delimit a zone_id prefix, so that was retained. A comma (,) is consistently used to delimit regions, so that was retained. Using a slash (/) to delimit alternate names/spellings is accepted English grammar, so that was chosen. Placing sub-regions after regions facilitates having list items begin in uppercase (which is both aesthetically pleasing and grammatically correct) and improves the usability of a sorted list; so that was chosen. Delimiting sub-regions with with curved braces () is in current practice, so that was chosen. Finally two letter codes for regions/sub-regions are included at the end of the sub-region(s) within the curved braces. Multiple regions grouped with the same sub-region(s) are delimited with a comma between the final region of the group and the sub-region(s). Region sub-region groups are delimited from other regions with a semicolon. At least one zone_id or region must be given. When adding a foreign country code to a zone_id on border locations, add it after the zone_id to accommodate implementations that sort the list. This will group zone_id's together, for example: Mountain Time - Chihuahua (away from US border) Mountain Time US - Chihuahua (near US border) Use full words in favor of abbreviations. This format can be represent as: [zone_id] [-] [region[(sub_region, ... [2_letter_code, ... ])][,|;] ... ] There currently are no zone table comments that model the full specification, so here is an imaginary example of the full spec: Central Scooter Time - Yamaha (YZ); Harley, Davidson, Sprint, (west coast XL, XR, FL, ST); Honda (most locations CB, CR), Suzuki, Kawasaki, Vespa The following changes since commit 99b658c3a129dfd0cb777337575e200656b8ff9d: * NEWS, Theory: Clear up descriptions of tzdata abbreviations. (2016-02-14 12:36:54 -0800) are available in the git repository at: git@github.com:jwpi/tz.git zonetab0215 for you to fetch changes up to cf921321194419bc88104da5d7a3a7cfac0ca47e: Standardize zone table comment format (2016-02-20 11:30:20 -0500) ---------------------------------------------------------------- J William Piggott (5): Holiday Islands does not exist. North of Scoresbysund is named National Park Durango is not a border state Use proper names for Baja California States Standardize zone table comment format australasia | 8 +++ europe | 8 +++ northamerica | 6 +- zone.tab | 240 +++++++++++++++++++++++++++++++-------------------------------- zone1970.tab | 250 +++++++++++++++++++++++++++++++++--------------------------------- 5 files changed, 264 insertions(+), 248 deletions(-) --- 8< Example zone1970.tab comments using the standardized format: Adelaide Island (Rothera Station) Anvers Island (Palmer Station) Holme Bay (Mawson Station) Vestfold Hills (Davis Station) Bailey Peninsula (Casey Station) Lake Vostok (Vostok Station) Adélie Land (Dumont-d'Urville Station) East Ongul Island (Syowa Station) Queen Maud Land (Troll Station) Buenos Aires (BA, CF) Argentina (most locations CB, CC, CN, ER, FM, MN, SE, SF) Salta (SA, LP, NQ, RN) Jujuy (JY) Tucumán (TM) Catamarca (CT), Chubut (CH) La Rioja (LR) San Juan (SJ) Mendoza (MZ) San Luis (SL) Santa Cruz (SC) Tierra del Fuego (TF) Samoa, Midway Lord Howe Island Macquarie Island Tasmania (most locations) Tasmania (King Island) Victoria New South Wales (most locations) New South Wales (Yancowinna) Queensland (most locations) Queensland (Whitsunday Islands) South Australia Northern Territory Western Australia (most locations) Western Australia (Eucla) Atlantic islands Pará (east), Amapá Northeast Brazil (MA, PI, CE, RN, PB) Pernambuco Tocantins Alagoas, Sergipe Bahia South Brazil, Southeast Brazil, (GO, DF, MG, ES, RJ, SP, PR, SC, RS) Mato Grosso do Sul Mato Grosso Pará (west) Rondônia Roraima Amazonas (east) Amazonas (west) Acre Newfoundland, Labrador (southeast) Atlantic Time - Nova Scotia (peninsula), Prince Edward Island Atlantic Time - Nova Scotia (Cape Breton) Atlantic Time - New Brunswick Atlantic Time - Labrador (most locations) Atlantic Standard Time - Quebec (Lower North Shore) Eastern Time - Ontario, Quebec, (most locations) Eastern Time - Ontario, Quebec, (places that did not observe DST 1967-1973) Eastern Time - Ontario (Thunder Bay) Eastern Time - Nunavut (most eastern locations) Eastern Time - Nunavut (Pangnirtung) Central Time - Nunavut (Resolute) Eastern Standard Time - Ontario (Atikokan), Nunavut (Southampton Island) Central Time - Nunavut (central) Central Time - Ontario (west), Manitoba Central Time - Ontario (Rainy River, Fort Frances) Central Standard Time - Saskatchewan (most locations) Central Standard Time - Saskatchewan (midwest) Mountain Time - Alberta, British Columbia (east), Saskatchewan (west) Mountain Time - Nunavut (west) Mountain Time - Northwest Territories (central) Mountain Time - Northwest Territories (west) Mountain Standard Time - British Columbia (Creston) Mountain Standard Time - British Columbia (Dawson Creek, Fort Saint John) Mountain Standard Time - British Columbia (Fort Nelson) Pacific Time - British Columbia (west) Pacific Time - Yukon (south) Pacific Time - Yukon (north) Swiss Time Chile (most locations) Easter Island Beijing Time Xinjiang Time Germany (most locations) Ecuador (mainland) Galápagos Islands Spain (mainland) Ceuta, Melilla Canary Islands Chuuk/Truk, Yap Pohnpei/Ponape Kosrae Greenland (most locations) National Park (east coast) Scoresbysund/Ittoqqortoormiit Thule/Pituffik Java, Sumatra Borneo (west, central) Borneo (east, south), Sulawesi (Celebes), Bali, Nusa Tengarra, Timor (west) New Guinea (West Papua / Irian Jaya), Maluku/Moluccas Gilbert Islands Phoenix Islands Line Islands Kazakhstan (most locations) Qyzylorda/Kyzylorda/Kzyl-Orda Aqtobe/Aktobe Atyrau/Atirau/Gur'yev, Mangghystau/Mankistau West Kazakhstan Marshall Islands (most locations) Kwajalein Mongolia (most locations) Bayan-Ölgii, Govi-Altai, Hovd, Uvs, Zavkhan Dornod, Sükhbaatar Central Time Eastern Standard Time - Quintana Roo Central Time - Campeche, Yucatán Central Time - Durango; Coahuila, Nuevo León, Tamaulipas, (away from US border) Central Time US - Coahuila, Nuevo León, Tamaulipas, (near US border) Mountain Time - Baja California Sur, Nayarit, Sinaloa Mountain Time - Chihuahua (away from US border) Mountain Time US - Chihuahua (near US border) Mountain Standard Time - Sonora Pacific Time US - Baja California Central Time - Bahía de Banderas Malaysia (peninsula) Sabah, Sarawak UTC+2 - Central Africa Time UTC+1 - West Africa Time New Zealand Time Chatham Islands Society Islands Marquesas Islands Gambier Islands Papua New Guinea (most locations) Bougainville Gaza Strip West Bank Portugal (mainland) Madeira Islands Azores Réunion Island, Crozet Islands, Scattered Islands Moscow-01 - Kaliningrad Moscow+00 - Russia (west) Moscow+00 - Crimea Moscow+00 - Caspian Sea Moscow+01 - Samara, Udmurtia Moscow+02 - Urals Moscow+03 - Siberia (west) Moscow+03 - Novosibirsk Moscow+04 - Kemerovo Moscow+04 - Yenisei River Moscow+05 - Lake Baikal Moscow+05 - Zabaykalsky Moscow+06 - Lena River Moscow+06 - Tomponsky, Ust-Maysky Moscow+07 - Amur River Moscow+07 - Sakhalin Island Moscow+07 - Oymyakonsky Moscow+07 - Magadan Moscow+08 - Sakha (east), North Kuril Islands Moscow+09 - Kamchatka Moscow+09 - Bering Sea Kerguelen, St Paul Island, Amsterdam Island Indochina (most locations) Ukraine (most locations) Ruthenia Zaporozh'ye/Zaporizhia, Lugansk/Luhansk (east) Wake Island Eastern Time Eastern Time - Michigan (most locations) Eastern Time - Kentucky (Louisville area) Eastern Time - Kentucky (Wayne) Eastern Time - Indiana (most locations) Eastern Time - Indiana (Daviess, Dubois, Knox, Martin) Eastern Time - Indiana (Pulaski) Eastern Time - Indiana (Crawford) Eastern Time - Indiana (Pike) Eastern Time - Indiana (Switzerland) Central Time Central Time - Indiana (Perry) Central Time - Indiana (Starke) Central Time - Michigan (Dickinson, Gogebic, Iron, Menominee) Central Time - North Dakota (Oliver) Central Time - North Dakota (Morton except Mandan area) Central Time - North Dakota (Mercer) Mountain Time Mountain Time - Idaho (south), Oregon (east) Mountain Standard Time - Arizona (except Navajo) Pacific Time Alaska Time Alaska Time - Alaska Panhandle Alaska Time - Alaska Panhandle (southeast) Alaska Time - Annette Island Alaska Time - Alaska Panhandle (neck) Alaska Time - Alaska (west) Aleutian Islands Hawaii Time Uzbekistan (west) Uzbekistan (east) Vietnam (south)

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zic changes (2/2)
by Arthur David Olson March 9, 2016

March 9, 2016

And now, the update. These changes arrange things so that binary files include "transition" entries for minimum time values; these entries eliminate localtime guesswork in handling low-valued time stamps. The bad news: binary files grow slightly as a result of these changes. The good news: there are no changes in the output of "zdump -v" applied to before-and-after versions of all the binary files generated by a "make install." Changes are attached and appear in mangled form below; these are relative to the github version of zic.c after the rollback in the earlier message today. @dashdashado 1.2 2805 lines 1.4 2813 lines *** /tmp/,azic.c 2014-05-01 01:51:36.998933800 -0400 --- /tmp/,bzic.c 2014-05-01 01:51:37.092534000 -0400 *************** *** 1480,1493 **** fromi = 0; while (fromi < timecnt && attypes[fromi].at < min_time) ++fromi; - if (isdsts[0] == 0) - while (fromi < timecnt && attypes[fromi].type == 0) - ++fromi; /* handled by default rule */ for ( ; fromi < timecnt; ++fromi) { ! if (toi != 0 && ((attypes[fromi].at + gmtoffs[attypes[toi - 1].type]) <= ! (attypes[toi - 1].at + gmtoffs[toi == 1 ? 0 ! : attypes[toi - 2].type]))) { attypes[toi - 1].type = attypes[fromi].type; continue; --- 1480,1490 ---- fromi = 0; while (fromi < timecnt && attypes[fromi].at < min_time) ++fromi; for ( ; fromi < timecnt; ++fromi) { ! if (toi > 1 && ((attypes[fromi].at + gmtoffs[attypes[toi - 1].type]) <= ! (attypes[toi - 1].at + ! gmtoffs[attypes[toi - 2].type]))) { attypes[toi - 1].type = attypes[fromi].type; continue; *************** *** 1532,1537 **** --- 1529,1541 ---- --timecnt32; ++timei32; } + /* + ** Output an INT32_MIN "transition" if appropriate--see below. + */ + if (timei32 > 0 && ats[timei32] > INT32_MIN) { + --timei32; + ++timecnt32; + } while (leapcnt32 > 0 && !is32(trans[leapcnt32 - 1])) --leapcnt32; while (leapcnt32 > 0 && !is32(trans[leapi32])) { *************** *** 1698,1704 **** #undef DO for (i = thistimei; i < thistimelim; ++i) if (pass == 1) ! puttzcode(ats[i], fp); else puttzcode64(ats[i], fp); for (i = thistimei; i < thistimelim; ++i) { unsigned char uc; --- 1702,1713 ---- #undef DO for (i = thistimei; i < thistimelim; ++i) if (pass == 1) ! /* ! ** Output an INT32_MIN "transition" ! ** if appropriate--see above. ! */ ! puttzcode(((ats[i] < INT32_MIN) ? ! INT32_MIN : ats[i]), fp); else puttzcode64(ats[i], fp); for (i = thistimei; i < thistimelim; ++i) { unsigned char uc; *************** *** 2176,2183 **** if (usestart) { addtt(starttime, type); usestart = FALSE; ! } else if (stdoff != 0) ! addtt(min_time, type); } else for (year = min_year; year <= max_year; ++year) { if (useuntil && year > zp->z_untilrule.r_hiyear) break; --- 2185,2191 ---- if (usestart) { addtt(starttime, type); usestart = FALSE; ! } else addtt(min_time, type); } else for (year = min_year; year <= max_year; ++year) { if (useuntil && year > zp->z_untilrule.r_hiyear) break;

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YouTube videos on time zones
by Matt Johnson March 8, 2016

March 8, 2016

If these two aren't in our art file, they probably should be. "Daylight Saving Time Explained" - CGP Grey https://youtu.be/84aWtseb2-4 Among other things, explains Arizona's enclaves and exclaves quite well. "The Problem with Time & Timezones" - Computerphile / Tom Scott https://youtu.be/-5wpm-gesOY Though Tom gets Nepal's time zone offset wrong - can you blame him?

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field separators in tzdata2016a.tar.gz
by Joris Wu March 8, 2016

March 8, 2016

Dear reader, While writing a Perl script to parse the original TZ data files, I discovered that most fields are separated by tab characters ( ASCII 09 ), yet some by spaces. Given the frequency, I expect tabs were the intended separator. It makes parsing less ambiguous anyhow. I converted a set of space separators in attached patches. Not all, as I do not know yet what is the intent here. Regards, Joris Software developer Brisbane

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[PATCH 1/1] Document tzselect std out redirection
by J William Piggott March 7, 2016

March 7, 2016

* tzselect.8: Implement this. Signed-off-by: J William Piggott <elseifthen(a)gmx.com> --- Question: What does the following sentence from this man-page mean? NOTES Applications should not assume that tzselect's output matches the user's political preferences. How can a TZ string define ones political preference? tzselect.8 | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/tzselect.8 b/tzselect.8 index fb39e1f..19f63bb 100644 --- a/tzselect.8 +++ b/tzselect.8 @@ -19,10 +19,16 @@ tzselect \- select a time zone .SH DESCRIPTION The .B tzselect -program asks the user for information about the current location, -and outputs the resulting time zone description to standard output. +program asks the user for information about a target location, +and outputs the corresponding time zone description to standard output. The output is suitable as a value for the TZ environment variable. .PP +If standard output is redirected to anything other than a terminal, +then the instructions following the confirmation prompt are not printed. +This is to facilitate calling +.B tzselect +from another program. +.PP All interaction with the user is done via standard input and standard error. .SH OPTIONS .TP

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tzcode: please rename the "new" argument in icatalloc()
by Markus Scherer March 7, 2016

March 7, 2016

tzcode/private.h has this declaration: char * icatalloc(char * old, const char * new); The "new" identifier prevents it from being compiled with a C++ compiler. Would you mind renaming the second argument? Thanks! markus

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[PATCH] POSIX TZ string validation bug
by J William Piggott March 7, 2016

March 7, 2016

Invalid Julian date of J00 passes. POSIX indicates that there should be no zero padding on 'Julian' dates: Jn The Julian day n (1 <= n <= 365). n The zero-based Julian day (0 <= n <= 365). * tzselect.ksh: Implement this. Signed-off-by: J William Piggott <elseifthen(a)gmx.com> --- tzselect.ksh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tzselect.ksh b/tzselect.ksh index ba763e7..d2c3a6d 100644 --- a/tzselect.ksh +++ b/tzselect.ksh @@ -351,8 +351,8 @@ while "(:[0-5][0-9](:[0-5][0-9])?)?" offset = "[-+]?" time mdate = "M([1-9]|1[0-2])\\.[1-5]\\.[0-6]" - jdate = "((J[1-9]|[0-9]|J?[1-2]?[0-9][0-9])" \ - "|J?3[0-5][0-9]|J?36[0-5])" + jdate = "((J[1-9]|[0-9]|J?[1-9][0-9]" \ + "|J?[1-2][0-9][0-9])|J?3[0-5][0-9]|J?36[0-5])" datetime = ",(" mdate "|" jdate ")(/" time ")?" tzpattern = "^(:.*|" tzname offset "(" tzname \ "(" offset ")?(" datetime datetime ")?)?)$"

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[PROPOSED PATCH] Add xkcd
by Paul Eggert March 6, 2016

March 6, 2016

* tz-art.htm: Add xkcd. Add URLs for specific comic strips or panels. --- tz-art.htm | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/tz-art.htm b/tz-art.htm index 57d9092..127ab69 100644 --- a/tz-art.htm +++ b/tz-art.htm @@ -353,10 +353,17 @@ broadcast 1997-02-13, in which Kramer decides that daylight saving time isn't coming fast enough, so he sets his watch ahead an hour. </li> <li> -The syndicated comic strip Dilbert featured an all-too-rare example of -time zone humor on 1998-03-14. +The syndicated comic strip Dilbert featured an +<a href='http://dilbert.com/strip/1998-03-14'>all-too-rare example of +time zone humor</a> on 1998-03-14. </li> <li> +The webcomic xkcd has the strip +"<a href='https://xkcd.com/673/'>The Sun</a>" (2009-12-09) and the panels +"<a href='https://xkcd.com/1017/'>Backward in Time</a>" (2012-02-14), +"<a href='https://xkcd.com/1061/'>EST</a>" (2012-05-28), and +"<a href='https://xkcd.com/1335/'>Now</a>" (2014-02-26). +<li> Surrealist artist Guy Billout's work "Date Line" appeared on page 103 of the 1999-11 Atlantic Monthly. </li> @@ -515,7 +522,7 @@ Peppermint Patty: "What if the world comes to an end tonight, Marcie?" Marcie: "I promise there'll be a tomorrow, sir ... in fact, it's already tomorrow in Australia!" -(Charles M. Schulz, Peanuts, 1980-06-13) +(Charles M. Schulz, <a href='http://www.gocomics.com/peanuts/1980/06/13'>Peanuts, 1980-06-13</a>) </li> </ul> </body> -- 2.5.0

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Time Lord Judah Levine
by Brian Inglis March 4, 2016

March 4, 2016

Wondered if you might want to give a mention in one of the HTML docs to the person responsible for providing our leap-seconds.list from NIST (courtesy of Tom Van Baak on Time-Nuts): https://www.febo.com/pipermail/time-nuts/2016-March/096401.html a couple of the articles quoted are more textual rather than Youtube link introductions: https://jila.colorado.edu/faculty/judah-levine http://cuindependent.com/2011/08/23/the-nations-time-lord/ -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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