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Diffstat (limited to 'absl/time/internal/cctz/src/time_zone_lookup_test.cc')
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diff --git a/absl/time/internal/cctz/src/time_zone_lookup_test.cc b/absl/time/internal/cctz/src/time_zone_lookup_test.cc new file mode 100644 index 0000000000..a5d73d5492 --- /dev/null +++ b/absl/time/internal/cctz/src/time_zone_lookup_test.cc @@ -0,0 +1,1259 @@ +// Copyright 2016 Google Inc. All Rights Reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "absl/time/internal/cctz/include/cctz/time_zone.h" + +#include <chrono> +#include <cstddef> +#include <future> +#include <string> +#include <thread> +#include <vector> + +#include "absl/time/internal/cctz/include/cctz/civil_time.h" +#include "gtest/gtest.h" + +using std::chrono::time_point_cast; +using std::chrono::system_clock; +using std::chrono::nanoseconds; +using std::chrono::microseconds; +using std::chrono::milliseconds; +using std::chrono::seconds; +using std::chrono::minutes; +using std::chrono::hours; + +namespace absl { +namespace time_internal { +namespace cctz { + +namespace { + +// A list of known time-zone names. +const char* const kTimeZoneNames[] = { + "Africa/Abidjan", + "Africa/Accra", + "Africa/Addis_Ababa", + "Africa/Algiers", + "Africa/Asmara", + "Africa/Asmera", + "Africa/Bamako", + "Africa/Bangui", + "Africa/Banjul", + "Africa/Bissau", + "Africa/Blantyre", + "Africa/Brazzaville", + "Africa/Bujumbura", + "Africa/Cairo", + "Africa/Casablanca", + "Africa/Ceuta", + "Africa/Conakry", + "Africa/Dakar", + "Africa/Dar_es_Salaam", + "Africa/Djibouti", + "Africa/Douala", + "Africa/El_Aaiun", + "Africa/Freetown", + "Africa/Gaborone", + "Africa/Harare", + "Africa/Johannesburg", + "Africa/Juba", + "Africa/Kampala", + "Africa/Khartoum", + "Africa/Kigali", + "Africa/Kinshasa", + "Africa/Lagos", + "Africa/Libreville", + "Africa/Lome", + "Africa/Luanda", + "Africa/Lubumbashi", + "Africa/Lusaka", + "Africa/Malabo", + "Africa/Maputo", + "Africa/Maseru", + "Africa/Mbabane", + "Africa/Mogadishu", + "Africa/Monrovia", + "Africa/Nairobi", + "Africa/Ndjamena", + "Africa/Niamey", + "Africa/Nouakchott", + "Africa/Ouagadougou", + "Africa/Porto-Novo", + "Africa/Sao_Tome", + "Africa/Timbuktu", + "Africa/Tripoli", + "Africa/Tunis", + "Africa/Windhoek", + "America/Adak", + "America/Anchorage", + "America/Anguilla", + "America/Antigua", + "America/Araguaina", + "America/Argentina/Buenos_Aires", + "America/Argentina/Catamarca", + "America/Argentina/ComodRivadavia", + "America/Argentina/Cordoba", + "America/Argentina/Jujuy", + "America/Argentina/La_Rioja", + "America/Argentina/Mendoza", + "America/Argentina/Rio_Gallegos", + "America/Argentina/Salta", + "America/Argentina/San_Juan", + "America/Argentina/San_Luis", + "America/Argentina/Tucuman", + "America/Argentina/Ushuaia", + "America/Aruba", + "America/Asuncion", + "America/Atikokan", + "America/Atka", + "America/Bahia", + "America/Bahia_Banderas", + "America/Barbados", + "America/Belem", + "America/Belize", + "America/Blanc-Sablon", + "America/Boa_Vista", + "America/Bogota", + "America/Boise", + "America/Buenos_Aires", + "America/Cambridge_Bay", + "America/Campo_Grande", + "America/Cancun", + "America/Caracas", + "America/Catamarca", + "America/Cayenne", + "America/Cayman", + "America/Chicago", + "America/Chihuahua", + "America/Coral_Harbour", + "America/Cordoba", + "America/Costa_Rica", + "America/Creston", + "America/Cuiaba", + "America/Curacao", + "America/Danmarkshavn", + "America/Dawson", + "America/Dawson_Creek", + "America/Denver", + "America/Detroit", + "America/Dominica", + "America/Edmonton", + "America/Eirunepe", + "America/El_Salvador", + "America/Ensenada", + "America/Fort_Nelson", + "America/Fort_Wayne", + "America/Fortaleza", + "America/Glace_Bay", + "America/Godthab", + "America/Goose_Bay", + "America/Grand_Turk", + "America/Grenada", + "America/Guadeloupe", + "America/Guatemala", + "America/Guayaquil", + "America/Guyana", + "America/Halifax", + "America/Havana", + "America/Hermosillo", + "America/Indiana/Indianapolis", + "America/Indiana/Knox", + "America/Indiana/Marengo", + "America/Indiana/Petersburg", + "America/Indiana/Tell_City", + "America/Indiana/Vevay", + "America/Indiana/Vincennes", + "America/Indiana/Winamac", + "America/Indianapolis", + "America/Inuvik", + "America/Iqaluit", + "America/Jamaica", + "America/Jujuy", + "America/Juneau", + "America/Kentucky/Louisville", + "America/Kentucky/Monticello", + "America/Knox_IN", + "America/Kralendijk", + "America/La_Paz", + "America/Lima", + "America/Los_Angeles", + "America/Louisville", + "America/Lower_Princes", + "America/Maceio", + "America/Managua", + "America/Manaus", + "America/Marigot", + "America/Martinique", + "America/Matamoros", + "America/Mazatlan", + "America/Mendoza", + "America/Menominee", + "America/Merida", + "America/Metlakatla", + "America/Mexico_City", + "America/Miquelon", + "America/Moncton", + "America/Monterrey", + "America/Montevideo", + "America/Montreal", + "America/Montserrat", + "America/Nassau", + "America/New_York", + "America/Nipigon", + "America/Nome", + "America/Noronha", + "America/North_Dakota/Beulah", + "America/North_Dakota/Center", + "America/North_Dakota/New_Salem", + "America/Ojinaga", + "America/Panama", + "America/Pangnirtung", + "America/Paramaribo", + "America/Phoenix", + "America/Port-au-Prince", + "America/Port_of_Spain", + "America/Porto_Acre", + "America/Porto_Velho", + "America/Puerto_Rico", + "America/Punta_Arenas", + "America/Rainy_River", + "America/Rankin_Inlet", + "America/Recife", + "America/Regina", + "America/Resolute", + "America/Rio_Branco", + "America/Rosario", + "America/Santa_Isabel", + "America/Santarem", + "America/Santiago", + "America/Santo_Domingo", + "America/Sao_Paulo", + "America/Scoresbysund", + "America/Shiprock", + "America/Sitka", + "America/St_Barthelemy", + "America/St_Johns", + "America/St_Kitts", + "America/St_Lucia", + "America/St_Thomas", + "America/St_Vincent", + "America/Swift_Current", + "America/Tegucigalpa", + "America/Thule", + "America/Thunder_Bay", + "America/Tijuana", + "America/Toronto", + "America/Tortola", + "America/Vancouver", + "America/Virgin", + "America/Whitehorse", + "America/Winnipeg", + "America/Yakutat", + "America/Yellowknife", + "Antarctica/Casey", + "Antarctica/Davis", + "Antarctica/DumontDUrville", + "Antarctica/Macquarie", + "Antarctica/Mawson", + "Antarctica/McMurdo", + "Antarctica/Palmer", + "Antarctica/Rothera", + "Antarctica/South_Pole", + "Antarctica/Syowa", + "Antarctica/Troll", + "Antarctica/Vostok", + "Arctic/Longyearbyen", + "Asia/Aden", + "Asia/Almaty", + "Asia/Amman", + "Asia/Anadyr", + "Asia/Aqtau", + "Asia/Aqtobe", + "Asia/Ashgabat", + "Asia/Ashkhabad", + "Asia/Atyrau", + "Asia/Baghdad", + "Asia/Bahrain", + "Asia/Baku", + "Asia/Bangkok", + "Asia/Barnaul", + "Asia/Beirut", + "Asia/Bishkek", + "Asia/Brunei", + "Asia/Calcutta", + "Asia/Chita", + "Asia/Choibalsan", + "Asia/Chongqing", + "Asia/Chungking", + "Asia/Colombo", + "Asia/Dacca", + "Asia/Damascus", + "Asia/Dhaka", + "Asia/Dili", + "Asia/Dubai", + "Asia/Dushanbe", + "Asia/Famagusta", + "Asia/Gaza", + "Asia/Harbin", + "Asia/Hebron", + "Asia/Ho_Chi_Minh", + "Asia/Hong_Kong", + "Asia/Hovd", + "Asia/Irkutsk", + "Asia/Istanbul", + "Asia/Jakarta", + "Asia/Jayapura", + "Asia/Jerusalem", + "Asia/Kabul", + "Asia/Kamchatka", + "Asia/Karachi", + "Asia/Kashgar", + "Asia/Kathmandu", + "Asia/Katmandu", + "Asia/Khandyga", + "Asia/Kolkata", + "Asia/Krasnoyarsk", + "Asia/Kuala_Lumpur", + "Asia/Kuching", + "Asia/Kuwait", + "Asia/Macao", + "Asia/Macau", + "Asia/Magadan", + "Asia/Makassar", + "Asia/Manila", + "Asia/Muscat", + "Asia/Nicosia", + "Asia/Novokuznetsk", + "Asia/Novosibirsk", + "Asia/Omsk", + "Asia/Oral", + "Asia/Phnom_Penh", + "Asia/Pontianak", + "Asia/Pyongyang", + "Asia/Qatar", + "Asia/Qyzylorda", + "Asia/Rangoon", + "Asia/Riyadh", + "Asia/Saigon", + "Asia/Sakhalin", + "Asia/Samarkand", + "Asia/Seoul", + "Asia/Shanghai", + "Asia/Singapore", + "Asia/Srednekolymsk", + "Asia/Taipei", + "Asia/Tashkent", + "Asia/Tbilisi", + "Asia/Tehran", + "Asia/Tel_Aviv", + "Asia/Thimbu", + "Asia/Thimphu", + "Asia/Tokyo", + "Asia/Tomsk", + "Asia/Ujung_Pandang", + "Asia/Ulaanbaatar", + "Asia/Ulan_Bator", + "Asia/Urumqi", + "Asia/Ust-Nera", + "Asia/Vientiane", + "Asia/Vladivostok", + "Asia/Yakutsk", + "Asia/Yangon", + "Asia/Yekaterinburg", + "Asia/Yerevan", + "Atlantic/Azores", + "Atlantic/Bermuda", + "Atlantic/Canary", + "Atlantic/Cape_Verde", + "Atlantic/Faeroe", + "Atlantic/Faroe", + "Atlantic/Jan_Mayen", + "Atlantic/Madeira", + "Atlantic/Reykjavik", + "Atlantic/South_Georgia", + "Atlantic/St_Helena", + "Atlantic/Stanley", + "Australia/ACT", + "Australia/Adelaide", + "Australia/Brisbane", + "Australia/Broken_Hill", + "Australia/Canberra", + "Australia/Currie", + "Australia/Darwin", + "Australia/Eucla", + "Australia/Hobart", + "Australia/LHI", + "Australia/Lindeman", + "Australia/Lord_Howe", + "Australia/Melbourne", + "Australia/NSW", + "Australia/North", + "Australia/Perth", + "Australia/Queensland", + "Australia/South", + "Australia/Sydney", + "Australia/Tasmania", + "Australia/Victoria", + "Australia/West", + "Australia/Yancowinna", + "Brazil/Acre", + "Brazil/DeNoronha", + "Brazil/East", + "Brazil/West", + "CET", + "CST6CDT", + "Canada/Atlantic", + "Canada/Central", + "Canada/East-Saskatchewan", + "Canada/Eastern", + "Canada/Mountain", + "Canada/Newfoundland", + "Canada/Pacific", + "Canada/Saskatchewan", + "Canada/Yukon", + "Chile/Continental", + "Chile/EasterIsland", + "Cuba", + "EET", + "EST", + "EST5EDT", + "Egypt", + "Eire", + "Etc/GMT", + "Etc/GMT+0", + "Etc/GMT+1", + "Etc/GMT+10", + "Etc/GMT+11", + "Etc/GMT+12", + "Etc/GMT+2", + "Etc/GMT+3", + "Etc/GMT+4", + "Etc/GMT+5", + "Etc/GMT+6", + "Etc/GMT+7", + "Etc/GMT+8", + "Etc/GMT+9", + "Etc/GMT-0", + "Etc/GMT-1", + "Etc/GMT-10", + "Etc/GMT-11", + "Etc/GMT-12", + "Etc/GMT-13", + "Etc/GMT-14", + "Etc/GMT-2", + "Etc/GMT-3", + "Etc/GMT-4", + "Etc/GMT-5", + "Etc/GMT-6", + "Etc/GMT-7", + "Etc/GMT-8", + "Etc/GMT-9", + "Etc/GMT0", + "Etc/Greenwich", + "Etc/UCT", + "Etc/UTC", + "Etc/Universal", + "Etc/Zulu", + "Europe/Amsterdam", + "Europe/Andorra", + "Europe/Astrakhan", + "Europe/Athens", + "Europe/Belfast", + "Europe/Belgrade", + "Europe/Berlin", + "Europe/Bratislava", + "Europe/Brussels", + "Europe/Bucharest", + "Europe/Budapest", + "Europe/Busingen", + "Europe/Chisinau", + "Europe/Copenhagen", + "Europe/Dublin", + "Europe/Gibraltar", + "Europe/Guernsey", + "Europe/Helsinki", + "Europe/Isle_of_Man", + "Europe/Istanbul", + "Europe/Jersey", + "Europe/Kaliningrad", + "Europe/Kiev", + "Europe/Kirov", + "Europe/Lisbon", + "Europe/Ljubljana", + "Europe/London", + "Europe/Luxembourg", + "Europe/Madrid", + "Europe/Malta", + "Europe/Mariehamn", + "Europe/Minsk", + "Europe/Monaco", + "Europe/Moscow", + "Europe/Nicosia", + "Europe/Oslo", + "Europe/Paris", + "Europe/Podgorica", + "Europe/Prague", + "Europe/Riga", + "Europe/Rome", + "Europe/Samara", + "Europe/San_Marino", + "Europe/Sarajevo", + "Europe/Saratov", + "Europe/Simferopol", + "Europe/Skopje", + "Europe/Sofia", + "Europe/Stockholm", + "Europe/Tallinn", + "Europe/Tirane", + "Europe/Tiraspol", + "Europe/Ulyanovsk", + "Europe/Uzhgorod", + "Europe/Vaduz", + "Europe/Vatican", + "Europe/Vienna", + "Europe/Vilnius", + "Europe/Volgograd", + "Europe/Warsaw", + "Europe/Zagreb", + "Europe/Zaporozhye", + "Europe/Zurich", + "GB", + "GB-Eire", + "GMT", + "GMT+0", + "GMT-0", + "GMT0", + "Greenwich", + "HST", + "Hongkong", + "Iceland", + "Indian/Antananarivo", + "Indian/Chagos", + "Indian/Christmas", + "Indian/Cocos", + "Indian/Comoro", + "Indian/Kerguelen", + "Indian/Mahe", + "Indian/Maldives", + "Indian/Mauritius", + "Indian/Mayotte", + "Indian/Reunion", + "Iran", + "Israel", + "Jamaica", + "Japan", + "Kwajalein", + "Libya", + "MET", + "MST", + "MST7MDT", + "Mexico/BajaNorte", + "Mexico/BajaSur", + "Mexico/General", + "NZ", + "NZ-CHAT", + "Navajo", + "PRC", + "PST8PDT", + "Pacific/Apia", + "Pacific/Auckland", + "Pacific/Bougainville", + "Pacific/Chatham", + "Pacific/Chuuk", + "Pacific/Easter", + "Pacific/Efate", + "Pacific/Enderbury", + "Pacific/Fakaofo", + "Pacific/Fiji", + "Pacific/Funafuti", + "Pacific/Galapagos", + "Pacific/Gambier", + "Pacific/Guadalcanal", + "Pacific/Guam", + "Pacific/Honolulu", + "Pacific/Johnston", + "Pacific/Kiritimati", + "Pacific/Kosrae", + "Pacific/Kwajalein", + "Pacific/Majuro", + "Pacific/Marquesas", + "Pacific/Midway", + "Pacific/Nauru", + "Pacific/Niue", + "Pacific/Norfolk", + "Pacific/Noumea", + "Pacific/Pago_Pago", + "Pacific/Palau", + "Pacific/Pitcairn", + "Pacific/Pohnpei", + "Pacific/Ponape", + "Pacific/Port_Moresby", + "Pacific/Rarotonga", + "Pacific/Saipan", + "Pacific/Samoa", + "Pacific/Tahiti", + "Pacific/Tarawa", + "Pacific/Tongatapu", + "Pacific/Truk", + "Pacific/Wake", + "Pacific/Wallis", + "Pacific/Yap", + "Poland", + "Portugal", + "ROC", + "ROK", + "Singapore", + "Turkey", + "UCT", + "US/Alaska", + "US/Aleutian", + "US/Arizona", + "US/Central", + "US/East-Indiana", + "US/Eastern", + "US/Hawaii", + "US/Indiana-Starke", + "US/Michigan", + "US/Mountain", + "US/Pacific", + "US/Samoa", + "UTC", + "Universal", + "W-SU", + "WET", + "Zulu", + nullptr +}; + +// Helper to return a loaded time zone by value (UTC on error). +time_zone LoadZone(const std::string& name) { + time_zone tz; + load_time_zone(name, &tz); + return tz; +} + +// This helper is a macro so that failed expectations show up with the +// correct line numbers. +#define ExpectTime(tp, tz, y, m, d, hh, mm, ss, off, isdst, zone) \ + do { \ + time_zone::absolute_lookup al = tz.lookup(tp); \ + EXPECT_EQ(y, al.cs.year()); \ + EXPECT_EQ(m, al.cs.month()); \ + EXPECT_EQ(d, al.cs.day()); \ + EXPECT_EQ(hh, al.cs.hour()); \ + EXPECT_EQ(mm, al.cs.minute()); \ + EXPECT_EQ(ss, al.cs.second()); \ + EXPECT_EQ(off, al.offset); \ + EXPECT_TRUE(isdst == al.is_dst); \ + /* EXPECT_STREQ(zone, al.abbr); */ \ + } while (0) + +} // namespace + +TEST(TimeZones, LoadZonesConcurrently) { + std::promise<void> ready_promise; + std::shared_future<void> ready_future(ready_promise.get_future()); + auto load_zones = [ready_future](std::promise<void>* started, + std::set<std::string>* failures) { + started->set_value(); + ready_future.wait(); + for (const char* const* np = kTimeZoneNames; *np != nullptr; ++np) { + std::string zone = *np; + time_zone tz; + if (load_time_zone(zone, &tz)) { + EXPECT_EQ(zone, tz.name()); + } else { + failures->insert(zone); + } + } + }; + + const std::size_t n_threads = 128; + std::vector<std::thread> threads; + std::vector<std::set<std::string>> thread_failures(n_threads); + for (std::size_t i = 0; i != n_threads; ++i) { + std::promise<void> started; + threads.emplace_back(load_zones, &started, &thread_failures[i]); + started.get_future().wait(); + } + ready_promise.set_value(); + for (auto& thread : threads) { + thread.join(); + } + + // Allow a small number of failures to account for skew between + // the contents of kTimeZoneNames and the zoneinfo data source. + const std::size_t max_failures = 3; + std::set<std::string> failures; + for (const auto& thread_failure : thread_failures) { + failures.insert(thread_failure.begin(), thread_failure.end()); + } + EXPECT_LE(failures.size(), max_failures) << testing::PrintToString(failures); +} + +TEST(TimeZone, NamedTimeZones) { + const time_zone utc = utc_time_zone(); + EXPECT_EQ("UTC", utc.name()); + const time_zone nyc = LoadZone("America/New_York"); + EXPECT_EQ("America/New_York", nyc.name()); + const time_zone syd = LoadZone("Australia/Sydney"); + EXPECT_EQ("Australia/Sydney", syd.name()); + const time_zone fixed0 = fixed_time_zone(sys_seconds::zero()); + EXPECT_EQ("UTC", fixed0.name()); + const time_zone fixed_pos = + fixed_time_zone(hours(3) + minutes(25) + seconds(45)); + EXPECT_EQ("Fixed/UTC+03:25:45", fixed_pos.name()); + const time_zone fixed_neg = + fixed_time_zone(-(hours(12) + minutes(34) + seconds(56))); + EXPECT_EQ("Fixed/UTC-12:34:56", fixed_neg.name()); +} + +TEST(TimeZone, Failures) { + time_zone tz; + EXPECT_FALSE(load_time_zone(":America/Los_Angeles", &tz)); + + tz = LoadZone("America/Los_Angeles"); + EXPECT_FALSE(load_time_zone("Invalid/TimeZone", &tz)); + EXPECT_EQ(system_clock::from_time_t(0), + convert(civil_second(1970, 1, 1, 0, 0, 0), tz)); // UTC + + // Ensures that the load still fails on a subsequent attempt. + tz = LoadZone("America/Los_Angeles"); + EXPECT_FALSE(load_time_zone("Invalid/TimeZone", &tz)); + EXPECT_EQ(system_clock::from_time_t(0), + convert(civil_second(1970, 1, 1, 0, 0, 0), tz)); // UTC + + // Loading an empty std::string timezone should fail. + tz = LoadZone("America/Los_Angeles"); + EXPECT_FALSE(load_time_zone("", &tz)); + EXPECT_EQ(system_clock::from_time_t(0), + convert(civil_second(1970, 1, 1, 0, 0, 0), tz)); // UTC +} + +TEST(TimeZone, Equality) { + const time_zone a; + const time_zone b; + EXPECT_EQ(a, b); + EXPECT_EQ(a.name(), b.name()); + + const time_zone implicit_utc; + const time_zone explicit_utc = utc_time_zone(); + EXPECT_EQ(implicit_utc, explicit_utc); + EXPECT_EQ(implicit_utc.name(), explicit_utc.name()); + + const time_zone fixed_zero = fixed_time_zone(sys_seconds::zero()); + EXPECT_EQ(fixed_zero, LoadZone(fixed_zero.name())); + EXPECT_EQ(fixed_zero, explicit_utc); + + const time_zone fixed_utc = LoadZone("Fixed/UTC+00:00:00"); + EXPECT_EQ(fixed_utc, LoadZone(fixed_utc.name())); + EXPECT_EQ(fixed_utc, explicit_utc); + + const time_zone fixed_pos = + fixed_time_zone(hours(3) + minutes(25) + seconds(45)); + EXPECT_EQ(fixed_pos, LoadZone(fixed_pos.name())); + EXPECT_NE(fixed_pos, explicit_utc); + const time_zone fixed_neg = + fixed_time_zone(-(hours(12) + minutes(34) + seconds(56))); + EXPECT_EQ(fixed_neg, LoadZone(fixed_neg.name())); + EXPECT_NE(fixed_neg, explicit_utc); + + const time_zone fixed_lim = fixed_time_zone(hours(24)); + EXPECT_EQ(fixed_lim, LoadZone(fixed_lim.name())); + EXPECT_NE(fixed_lim, explicit_utc); + const time_zone fixed_ovfl = fixed_time_zone(hours(24) + seconds(1)); + EXPECT_EQ(fixed_ovfl, LoadZone(fixed_ovfl.name())); + EXPECT_EQ(fixed_ovfl, explicit_utc); + + EXPECT_EQ(fixed_time_zone(seconds(1)), fixed_time_zone(seconds(1))); + + const time_zone local = local_time_zone(); + EXPECT_EQ(local, LoadZone(local.name())); + + time_zone la = LoadZone("America/Los_Angeles"); + time_zone nyc = LoadZone("America/New_York"); + EXPECT_NE(la, nyc); +} + +TEST(StdChronoTimePoint, TimeTAlignment) { + // Ensures that the Unix epoch and the system clock epoch are an integral + // number of seconds apart. This simplifies conversions to/from time_t. + auto diff = system_clock::time_point() - system_clock::from_time_t(0); + EXPECT_EQ(system_clock::time_point::duration::zero(), diff % seconds(1)); +} + +TEST(BreakTime, TimePointResolution) { + const time_zone utc = utc_time_zone(); + const auto t0 = system_clock::from_time_t(0); + + ExpectTime(time_point_cast<nanoseconds>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + ExpectTime(time_point_cast<microseconds>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + ExpectTime(time_point_cast<milliseconds>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + ExpectTime(time_point_cast<seconds>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + ExpectTime(time_point_cast<sys_seconds>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + ExpectTime(time_point_cast<minutes>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + ExpectTime(time_point_cast<hours>(t0), utc, + 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); +} + +TEST(BreakTime, LocalTimeInUTC) { + const time_zone tz = utc_time_zone(); + const auto tp = system_clock::from_time_t(0); + ExpectTime(tp, tz, 1970, 1, 1, 0, 0, 0, 0, false, "UTC"); + EXPECT_EQ(weekday::thursday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(BreakTime, LocalTimeInUTCUnaligned) { + const time_zone tz = utc_time_zone(); + const auto tp = system_clock::from_time_t(0) - milliseconds(500); + ExpectTime(tp, tz, 1969, 12, 31, 23, 59, 59, 0, false, "UTC"); + EXPECT_EQ(weekday::wednesday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(BreakTime, LocalTimePosix) { + // See IEEE Std 1003.1-1988 B.2.3 General Terms, Epoch. + const time_zone tz = utc_time_zone(); + const auto tp = system_clock::from_time_t(536457599); + ExpectTime(tp, tz, 1986, 12, 31, 23, 59, 59, 0, false, "UTC"); + EXPECT_EQ(weekday::wednesday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(TimeZoneImpl, LocalTimeInFixed) { + const sys_seconds offset = -(hours(8) + minutes(33) + seconds(47)); + const time_zone tz = fixed_time_zone(offset); + const auto tp = system_clock::from_time_t(0); + ExpectTime(tp, tz, 1969, 12, 31, 15, 26, 13, offset.count(), false, + "UTC-083347"); + EXPECT_EQ(weekday::wednesday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(BreakTime, LocalTimeInNewYork) { + const time_zone tz = LoadZone("America/New_York"); + const auto tp = system_clock::from_time_t(45); + ExpectTime(tp, tz, 1969, 12, 31, 19, 0, 45, -5 * 60 * 60, false, "EST"); + EXPECT_EQ(weekday::wednesday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(BreakTime, LocalTimeInMTV) { + const time_zone tz = LoadZone("America/Los_Angeles"); + const auto tp = system_clock::from_time_t(1380855729); + ExpectTime(tp, tz, 2013, 10, 3, 20, 2, 9, -7 * 60 * 60, true, "PDT"); + EXPECT_EQ(weekday::thursday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(BreakTime, LocalTimeInSydney) { + const time_zone tz = LoadZone("Australia/Sydney"); + const auto tp = system_clock::from_time_t(90); + ExpectTime(tp, tz, 1970, 1, 1, 10, 1, 30, 10 * 60 * 60, false, "AEST"); + EXPECT_EQ(weekday::thursday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(MakeTime, TimePointResolution) { + const time_zone utc = utc_time_zone(); + const time_point<nanoseconds> tp_ns = + convert(civil_second(2015, 1, 2, 3, 4, 5), utc); + EXPECT_EQ("04:05", format("%M:%E*S", tp_ns, utc)); + const time_point<microseconds> tp_us = + convert(civil_second(2015, 1, 2, 3, 4, 5), utc); + EXPECT_EQ("04:05", format("%M:%E*S", tp_us, utc)); + const time_point<milliseconds> tp_ms = + convert(civil_second(2015, 1, 2, 3, 4, 5), utc); + EXPECT_EQ("04:05", format("%M:%E*S", tp_ms, utc)); + const time_point<seconds> tp_s = + convert(civil_second(2015, 1, 2, 3, 4, 5), utc); + EXPECT_EQ("04:05", format("%M:%E*S", tp_s, utc)); + const time_point<sys_seconds> tp_s64 = + convert(civil_second(2015, 1, 2, 3, 4, 5), utc); + EXPECT_EQ("04:05", format("%M:%E*S", tp_s64, utc)); + + // These next two require time_point_cast because the conversion from a + // resolution of seconds (the return value of convert()) to a coarser + // resolution requires an explicit cast. + const time_point<minutes> tp_m = + time_point_cast<minutes>( + convert(civil_second(2015, 1, 2, 3, 4, 5), utc)); + EXPECT_EQ("04:00", format("%M:%E*S", tp_m, utc)); + const time_point<hours> tp_h = + time_point_cast<hours>( + convert(civil_second(2015, 1, 2, 3, 4, 5), utc)); + EXPECT_EQ("00:00", format("%M:%E*S", tp_h, utc)); +} + +TEST(MakeTime, Normalization) { + const time_zone tz = LoadZone("America/New_York"); + const auto tp = convert(civil_second(2009, 2, 13, 18, 31, 30), tz); + EXPECT_EQ(system_clock::from_time_t(1234567890), tp); + + // Now requests for the same time_point but with out-of-range fields. + EXPECT_EQ(tp, convert(civil_second(2008, 14, 13, 18, 31, 30), tz)); // month + EXPECT_EQ(tp, convert(civil_second(2009, 1, 44, 18, 31, 30), tz)); // day + EXPECT_EQ(tp, convert(civil_second(2009, 2, 12, 42, 31, 30), tz)); // hour + EXPECT_EQ(tp, convert(civil_second(2009, 2, 13, 17, 91, 30), tz)); // minute + EXPECT_EQ(tp, convert(civil_second(2009, 2, 13, 18, 30, 90), tz)); // second +} + +// NOTE: Run this with --copt=-ftrapv to detect overflow problems. +TEST(MakeTime, SysSecondsLimits) { + const char RFC3339[] = "%Y-%m-%dT%H:%M:%S%Ez"; + const time_zone utc = utc_time_zone(); + const time_zone east = fixed_time_zone(hours(14)); + const time_zone west = fixed_time_zone(-hours(14)); + time_point<sys_seconds> tp; + + // Approach the maximal time_point<sys_seconds> value from below. + tp = convert(civil_second(292277026596, 12, 4, 15, 30, 6), utc); + EXPECT_EQ("292277026596-12-04T15:30:06+00:00", format(RFC3339, tp, utc)); + tp = convert(civil_second(292277026596, 12, 4, 15, 30, 7), utc); + EXPECT_EQ("292277026596-12-04T15:30:07+00:00", format(RFC3339, tp, utc)); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + tp = convert(civil_second(292277026596, 12, 4, 15, 30, 8), utc); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + tp = convert(civil_second::max(), utc); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + + // Checks that we can also get the maximal value for a far-east zone. + tp = convert(civil_second(292277026596, 12, 5, 5, 30, 7), east); + EXPECT_EQ("292277026596-12-05T05:30:07+14:00", format(RFC3339, tp, east)); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + tp = convert(civil_second(292277026596, 12, 5, 5, 30, 8), east); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + tp = convert(civil_second::max(), east); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + + // Checks that we can also get the maximal value for a far-west zone. + tp = convert(civil_second(292277026596, 12, 4, 1, 30, 7), west); + EXPECT_EQ("292277026596-12-04T01:30:07-14:00", format(RFC3339, tp, west)); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + tp = convert(civil_second(292277026596, 12, 4, 7, 30, 8), west); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + tp = convert(civil_second::max(), west); + EXPECT_EQ(time_point<sys_seconds>::max(), tp); + + // Approach the minimal time_point<sys_seconds> value from above. + tp = convert(civil_second(-292277022657, 1, 27, 8, 29, 53), utc); + EXPECT_EQ("-292277022657-01-27T08:29:53+00:00", format(RFC3339, tp, utc)); + tp = convert(civil_second(-292277022657, 1, 27, 8, 29, 52), utc); + EXPECT_EQ("-292277022657-01-27T08:29:52+00:00", format(RFC3339, tp, utc)); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + tp = convert(civil_second(-292277022657, 1, 27, 8, 29, 51), utc); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + tp = convert(civil_second::min(), utc); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + + // Checks that we can also get the minimal value for a far-east zone. + tp = convert(civil_second(-292277022657, 1, 27, 22, 29, 52), east); + EXPECT_EQ("-292277022657-01-27T22:29:52+14:00", format(RFC3339, tp, east)); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + tp = convert(civil_second(-292277022657, 1, 27, 22, 29, 51), east); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + tp = convert(civil_second::min(), east); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + + // Checks that we can also get the minimal value for a far-west zone. + tp = convert(civil_second(-292277022657, 1, 26, 18, 29, 52), west); + EXPECT_EQ("-292277022657-01-26T18:29:52-14:00", format(RFC3339, tp, west)); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + tp = convert(civil_second(-292277022657, 1, 26, 18, 29, 51), west); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); + tp = convert(civil_second::min(), west); + EXPECT_EQ(time_point<sys_seconds>::min(), tp); +} + +TEST(TimeZoneEdgeCase, AmericaNewYork) { + const time_zone tz = LoadZone("America/New_York"); + + // Spring 1:59:59 -> 3:00:00 + auto tp = convert(civil_second(2013, 3, 10, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 3, 10, 1, 59, 59, -5 * 3600, false, "EST"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 3, 10, 3, 0, 0, -4 * 3600, true, "EDT"); + + // Fall 1:59:59 -> 1:00:00 + tp = convert(civil_second(2013, 11, 3, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 11, 3, 1, 59, 59, -4 * 3600, true, "EDT"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 11, 3, 1, 0, 0, -5 * 3600, false, "EST"); +} + +TEST(TimeZoneEdgeCase, AmericaLosAngeles) { + const time_zone tz = LoadZone("America/Los_Angeles"); + + // Spring 1:59:59 -> 3:00:00 + auto tp = convert(civil_second(2013, 3, 10, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 3, 10, 1, 59, 59, -8 * 3600, false, "PST"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 3, 10, 3, 0, 0, -7 * 3600, true, "PDT"); + + // Fall 1:59:59 -> 1:00:00 + tp = convert(civil_second(2013, 11, 3, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 11, 3, 1, 59, 59, -7 * 3600, true, "PDT"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 11, 3, 1, 0, 0, -8 * 3600, false, "PST"); +} + +TEST(TimeZoneEdgeCase, ArizonaNoTransition) { + const time_zone tz = LoadZone("America/Phoenix"); + + // No transition in Spring. + auto tp = convert(civil_second(2013, 3, 10, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 3, 10, 1, 59, 59, -7 * 3600, false, "MST"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 3, 10, 2, 0, 0, -7 * 3600, false, "MST"); + + // No transition in Fall. + tp = convert(civil_second(2013, 11, 3, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 11, 3, 1, 59, 59, -7 * 3600, false, "MST"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 11, 3, 2, 0, 0, -7 * 3600, false, "MST"); +} + +TEST(TimeZoneEdgeCase, AsiaKathmandu) { + const time_zone tz = LoadZone("Asia/Kathmandu"); + + // A non-DST offset change from +0530 to +0545 + // + // 504901799 == Tue, 31 Dec 1985 23:59:59 +0530 (+0530) + // 504901800 == Wed, 1 Jan 1986 00:15:00 +0545 (+0545) + auto tp = convert(civil_second(1985, 12, 31, 23, 59, 59), tz); + ExpectTime(tp, tz, 1985, 12, 31, 23, 59, 59, 5.5 * 3600, false, "+0530"); + tp += seconds(1); + ExpectTime(tp, tz, 1986, 1, 1, 0, 15, 0, 5.75 * 3600, false, "+0545"); +} + +TEST(TimeZoneEdgeCase, PacificChatham) { + const time_zone tz = LoadZone("Pacific/Chatham"); + + // One-hour DST offset changes, but at atypical values + // + // 1365256799 == Sun, 7 Apr 2013 03:44:59 +1345 (+1345) + // 1365256800 == Sun, 7 Apr 2013 02:45:00 +1245 (+1245) + auto tp = convert(civil_second(2013, 4, 7, 3, 44, 59), tz); + ExpectTime(tp, tz, 2013, 4, 7, 3, 44, 59, 13.75 * 3600, true, "+1345"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 4, 7, 2, 45, 0, 12.75 * 3600, false, "+1245"); + + // 1380376799 == Sun, 29 Sep 2013 02:44:59 +1245 (+1245) + // 1380376800 == Sun, 29 Sep 2013 03:45:00 +1345 (+1345) + tp = convert(civil_second(2013, 9, 29, 2, 44, 59), tz); + ExpectTime(tp, tz, 2013, 9, 29, 2, 44, 59, 12.75 * 3600, false, "+1245"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 9, 29, 3, 45, 0, 13.75 * 3600, true, "+1345"); +} + +TEST(TimeZoneEdgeCase, AustraliaLordHowe) { + const time_zone tz = LoadZone("Australia/Lord_Howe"); + + // Half-hour DST offset changes + // + // 1365260399 == Sun, 7 Apr 2013 01:59:59 +1100 (+11) + // 1365260400 == Sun, 7 Apr 2013 01:30:00 +1030 (+1030) + auto tp = convert(civil_second(2013, 4, 7, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 4, 7, 1, 59, 59, 11 * 3600, true, "+11"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 4, 7, 1, 30, 0, 10.5 * 3600, false, "+1030"); + + // 1380986999 == Sun, 6 Oct 2013 01:59:59 +1030 (+1030) + // 1380987000 == Sun, 6 Oct 2013 02:30:00 +1100 (+11) + tp = convert(civil_second(2013, 10, 6, 1, 59, 59), tz); + ExpectTime(tp, tz, 2013, 10, 6, 1, 59, 59, 10.5 * 3600, false, "+1030"); + tp += seconds(1); + ExpectTime(tp, tz, 2013, 10, 6, 2, 30, 0, 11 * 3600, true, "+11"); +} + +TEST(TimeZoneEdgeCase, PacificApia) { + const time_zone tz = LoadZone("Pacific/Apia"); + + // At the end of December 2011, Samoa jumped forward by one day, + // skipping 30 December from the local calendar, when the nation + // moved to the west of the International Date Line. + // + // A one-day, non-DST offset change + // + // 1325239199 == Thu, 29 Dec 2011 23:59:59 -1000 (-10) + // 1325239200 == Sat, 31 Dec 2011 00:00:00 +1400 (+14) + auto tp = convert(civil_second(2011, 12, 29, 23, 59, 59), tz); + ExpectTime(tp, tz, 2011, 12, 29, 23, 59, 59, -10 * 3600, true, "-10"); + EXPECT_EQ(363, get_yearday(civil_day(convert(tp, tz)))); + tp += seconds(1); + ExpectTime(tp, tz, 2011, 12, 31, 0, 0, 0, 14 * 3600, true, "+14"); + EXPECT_EQ(365, get_yearday(civil_day(convert(tp, tz)))); +} + +TEST(TimeZoneEdgeCase, AfricaCairo) { + const time_zone tz = LoadZone("Africa/Cairo"); + + // An interesting case of midnight not existing. + // + // 1400191199 == Thu, 15 May 2014 23:59:59 +0200 (EET) + // 1400191200 == Fri, 16 May 2014 01:00:00 +0300 (EEST) + auto tp = convert(civil_second(2014, 5, 15, 23, 59, 59), tz); + ExpectTime(tp, tz, 2014, 5, 15, 23, 59, 59, 2 * 3600, false, "EET"); + tp += seconds(1); + ExpectTime(tp, tz, 2014, 5, 16, 1, 0, 0, 3 * 3600, true, "EEST"); +} + +TEST(TimeZoneEdgeCase, AfricaMonrovia) { + const time_zone tz = LoadZone("Africa/Monrovia"); + + // Strange offset change -00:44:30 -> +00:00:00 (non-DST) + // + // 63593069 == Thu, 6 Jan 1972 23:59:59 -0044 (MMT) + // 63593070 == Fri, 7 Jan 1972 00:44:30 +0000 (GMT) + auto tp = convert(civil_second(1972, 1, 6, 23, 59, 59), tz); + ExpectTime(tp, tz, 1972, 1, 6, 23, 59, 59, -44.5 * 60, false, "MMT"); + tp += seconds(1); +#ifndef TZDATA_2017B_IS_UBIQUITOUS + // The 2017b tzdata release moved the shift from -004430 to +00 + // from 1972-05-01 to 1972-01-07, so we temporarily accept both + // outcomes until 2017b is ubiquitous. + if (tz.lookup(tp).offset == -44.5 * 60) { + tp = convert(civil_second(1972, 4, 30, 23, 59, 59), tz); + ExpectTime(tp, tz, 1972, 4, 30, 23, 59, 59, -44.5 * 60, false, "LRT"); + tp += seconds(1); + ExpectTime(tp, tz, 1972, 5, 1, 0, 44, 30, 0 * 60, false, "GMT"); + return; + } +#endif + ExpectTime(tp, tz, 1972, 1, 7, 0, 44, 30, 0 * 60, false, "GMT"); +} + +TEST(TimeZoneEdgeCase, AmericaJamaica) { + // Jamaica discontinued DST transitions in 1983, and is now at a + // constant -0500. This makes it an interesting edge-case target. + // Note that the 32-bit times used in a (tzh_version == 0) zoneinfo + // file cannot represent the abbreviation-only transition of 1890, + // so we ignore the abbreviation by expecting what we received. + const time_zone tz = LoadZone("America/Jamaica"); + + // Before the first transition. + auto tp = convert(civil_second(1889, 12, 31, 0, 0, 0), tz); +#if AMERICA_JAMAICA_PRE_1913_OFFSET_FIX + // Commit 907241e: Fix off-by-1 error for Jamaica and T&C before 1913. + // Until that commit has made its way into a full release we avoid the + // expectations on the -18430 offset below. TODO: Uncomment these. + ExpectTime(tp, tz, 1889, 12, 31, 0, 0, 0, -18430, false, + tz.lookup(tp).abbr); + + // Over the first (abbreviation-change only) transition. + // -2524503170 == Tue, 31 Dec 1889 23:59:59 -0507 (LMT) + // -2524503169 == Wed, 1 Jan 1890 00:00:00 -0507 (KMT) + tp = convert(civil_second(1889, 12, 31, 23, 59, 59), tz); + ExpectTime(tp, tz, 1889, 12, 31, 23, 59, 59, -18430, false, + tz.lookup(tp).abbr); + tp += seconds(1); + ExpectTime(tp, tz, 1890, 1, 1, 0, 0, 0, -18430, false, "KMT"); +#endif + + // Over the last (DST) transition. + // 436341599 == Sun, 30 Oct 1983 01:59:59 -0400 (EDT) + // 436341600 == Sun, 30 Oct 1983 01:00:00 -0500 (EST) + tp = convert(civil_second(1983, 10, 30, 1, 59, 59), tz); + ExpectTime(tp, tz, 1983, 10, 30, 1, 59, 59, -4 * 3600, true, "EDT"); + tp += seconds(1); + ExpectTime(tp, tz, 1983, 10, 30, 1, 0, 0, -5 * 3600, false, "EST"); + + // After the last transition. + tp = convert(civil_second(1983, 12, 31, 23, 59, 59), tz); + ExpectTime(tp, tz, 1983, 12, 31, 23, 59, 59, -5 * 3600, false, "EST"); +} + +TEST(TimeZoneEdgeCase, WET) { + // Cover some non-existent times within forward transitions. + const time_zone tz = LoadZone("WET"); + + // Before the first transition. + auto tp = convert(civil_second(1977, 1, 1, 0, 0, 0), tz); + ExpectTime(tp, tz, 1977, 1, 1, 0, 0, 0, 0, false, "WET"); + + // Over the first transition. + // 228877199 == Sun, 3 Apr 1977 00:59:59 +0000 (WET) + // 228877200 == Sun, 3 Apr 1977 02:00:00 +0100 (WEST) + tp = convert(civil_second(1977, 4, 3, 0, 59, 59), tz); + ExpectTime(tp, tz, 1977, 4, 3, 0, 59, 59, 0, false, "WET"); + tp += seconds(1); + ExpectTime(tp, tz, 1977, 4, 3, 2, 0, 0, 1 * 3600, true, "WEST"); + + // A non-existent time within the first transition. + time_zone::civil_lookup cl1 = tz.lookup(civil_second(1977, 4, 3, 1, 15, 0)); + EXPECT_EQ(time_zone::civil_lookup::SKIPPED, cl1.kind); + ExpectTime(cl1.pre, tz, 1977, 4, 3, 2, 15, 0, 1 * 3600, true, "WEST"); + ExpectTime(cl1.trans, tz, 1977, 4, 3, 2, 0, 0, 1 * 3600, true, "WEST"); + ExpectTime(cl1.post, tz, 1977, 4, 3, 0, 15, 0, 0 * 3600, false, "WET"); + + // A non-existent time within the second forward transition. + time_zone::civil_lookup cl2 = tz.lookup(civil_second(1978, 4, 2, 1, 15, 0)); + EXPECT_EQ(time_zone::civil_lookup::SKIPPED, cl2.kind); + ExpectTime(cl2.pre, tz, 1978, 4, 2, 2, 15, 0, 1 * 3600, true, "WEST"); + ExpectTime(cl2.trans, tz, 1978, 4, 2, 2, 0, 0, 1 * 3600, true, "WEST"); + ExpectTime(cl2.post, tz, 1978, 4, 2, 0, 15, 0, 0 * 3600, false, "WET"); +} + +TEST(TimeZoneEdgeCase, FixedOffsets) { + const time_zone gmtm5 = LoadZone("Etc/GMT+5"); // -0500 + auto tp = convert(civil_second(1970, 1, 1, 0, 0, 0), gmtm5); + ExpectTime(tp, gmtm5, 1970, 1, 1, 0, 0, 0, -5 * 3600, false, "-05"); + EXPECT_EQ(system_clock::from_time_t(5 * 3600), tp); + + const time_zone gmtp5 = LoadZone("Etc/GMT-5"); // +0500 + tp = convert(civil_second(1970, 1, 1, 0, 0, 0), gmtp5); + ExpectTime(tp, gmtp5, 1970, 1, 1, 0, 0, 0, 5 * 3600, false, "+05"); + EXPECT_EQ(system_clock::from_time_t(-5 * 3600), tp); +} + +TEST(TimeZoneEdgeCase, NegativeYear) { + // Tests transition from year 0 (aka 1BCE) to year -1. + const time_zone tz = utc_time_zone(); + auto tp = convert(civil_second(0, 1, 1, 0, 0, 0), tz); + ExpectTime(tp, tz, 0, 1, 1, 0, 0, 0, 0 * 3600, false, "UTC"); + EXPECT_EQ(weekday::saturday, get_weekday(civil_day(convert(tp, tz)))); + tp -= seconds(1); + ExpectTime(tp, tz, -1, 12, 31, 23, 59, 59, 0 * 3600, false, "UTC"); + EXPECT_EQ(weekday::friday, get_weekday(civil_day(convert(tp, tz)))); +} + +TEST(TimeZoneEdgeCase, UTC32bitLimit) { + const time_zone tz = utc_time_zone(); + + // Limits of signed 32-bit time_t + // + // 2147483647 == Tue, 19 Jan 2038 03:14:07 +0000 (UTC) + // 2147483648 == Tue, 19 Jan 2038 03:14:08 +0000 (UTC) + auto tp = convert(civil_second(2038, 1, 19, 3, 14, 7), tz); + ExpectTime(tp, tz, 2038, 1, 19, 3, 14, 7, 0 * 3600, false, "UTC"); + tp += seconds(1); + ExpectTime(tp, tz, 2038, 1, 19, 3, 14, 8, 0 * 3600, false, "UTC"); +} + +TEST(TimeZoneEdgeCase, UTC5DigitYear) { + const time_zone tz = utc_time_zone(); + + // Rollover to 5-digit year + // + // 253402300799 == Fri, 31 Dec 9999 23:59:59 +0000 (UTC) + // 253402300800 == Sat, 1 Jan 1000 00:00:00 +0000 (UTC) + auto tp = convert(civil_second(9999, 12, 31, 23, 59, 59), tz); + ExpectTime(tp, tz, 9999, 12, 31, 23, 59, 59, 0 * 3600, false, "UTC"); + tp += seconds(1); + ExpectTime(tp, tz, 10000, 1, 1, 0, 0, 0, 0 * 3600, false, "UTC"); +} + +} // namespace cctz +} // namespace time_internal +} // namespace absl |