dejurin · September 3, 2025 18:08
diff --git a/abbr.ts b/abbr.ts
 // Variant type for clarity
 type TZVariant = {
  name: string;        // Human-readable timezone name
  iana: string[];      // One or more IANA zones (first is canonical)
  note?: string;       // Optional note (DST/legacy/unofficial/etc.)
 };

 // Map: Abbreviation -> possible variants
 export const TZ_MAP_PART_A: Record<string, TZVariant[]> = {
  // Military letter zone. Note the inverted sign in Etc/GMT*: Etc/GMT-1 === UTC+1
  A: [
    {
      name: "Alfa Time Zone (Military)",
      iana: ["Etc/GMT-1"],
      note: "Fixed offset; use for UTC+1. Military letters are deprecated in civil use.",
    },
  ],

  ACDT: [
    {
      name:
        "Australian Central Daylight Time (CDT / CDST / Central Daylight Savings Time)",
      iana: ["Australia/Adelaide", "Australia/Broken_Hill"],
      note: "UTC+10:30 during DST in South Australia & Broken Hill.",
    },
  ],

  ACST: [
    {
      name: "Australian Central Standard Time (CST / Central Standard Time)",
      iana: ["Australia/Darwin", "Australia/Adelaide"],
      note: "UTC+9:30. Darwin is year-round; Adelaide uses it outside DST.",
    },
  ],

  // ACT is ambiguous: "Acre Time" (Brazil, UTC−5) vs "Australian Central Time" (region label)
  ACT: [
    {
      name: "Acre Time",
      iana: ["America/Rio_Branco", "America/Eirunepe"],
      note: "UTC−5 (western Brazil).",
    },
    {
      name: "Australian Central Time",
      iana: ["Australia/Darwin", "Australia/Adelaide", "Australia/Broken_Hill"],
      note:
        "Region label (UTC+9:30 standard / UTC+10:30 DST). Prefer concrete zones above.",
    },
  ],

  ACWST: [
    {
      name: "Australian Central Western Standard Time",
      iana: ["Australia/Eucla"],
      note: "UTC+8:45 (semi-official local time).",
    },
  ],

  // ADT is ambiguous: Arabia Daylight (historical) vs Atlantic Daylight (North America)
  ADT: [
    {
      name: "Arabia Daylight Time (AST / Arabia Summer Time)",
      iana: ["Asia/Baghdad", "Asia/Riyadh"],
      note:
        "Historical/rare DST usage in the region; most countries do NOT observe DST now.",
    },
    {
      name:
        "Atlantic Daylight Time (ADST / Atlantic Daylight Saving Time / HAA)",
      iana: [
        "America/Halifax",
        "America/Glace_Bay",
        "America/Moncton",
        "Atlantic/Bermuda",
        "America/Goose_Bay",
      ],
      note: "UTC−3 in summer across Atlantic Canada & Bermuda.",
    },
  ],

  AEDT: [
    {
      name:
        "Australian Eastern Daylight Time (EDT / EDST / Eastern Daylight Saving Time)",
      iana: ["Australia/Sydney", "Australia/Melbourne", "Australia/Hobart"],
      note: "UTC+11 during DST.",
    },
  ],

  AEST: [
    {
      name: "Australian Eastern Standard Time (EST / AET)",
      iana: ["Australia/Brisbane", "Australia/Sydney", "Australia/Melbourne", "Australia/Hobart"],
      note: "UTC+10 (Brisbane is year-round; others in winter).",
    },
  ],

  AET: [
    {
      name: "Australian Eastern Time",
      iana: ["Australia/Sydney", "Australia/Melbourne", "Australia/Brisbane"],
      note: "Region label covering both AEST (UTC+10) and AEDT (UTC+11).",
    },
  ],

  AFT: [
    {
      name: "Afghanistan Time",
      iana: ["Asia/Kabul"],
      note: "UTC+4:30.",
    },
  ],

  AKDT: [
    {
      name: "Alaska Daylight Time (ADST / Alaska Daylight Saving Time)",
      iana: [
        "America/Anchorage",
        "America/Juneau",
        "America/Sitka",
        "America/Nome",
        "America/Yakutat",
      ],
      note: "UTC−8 during DST.",
    },
  ],

  AKST: [
    {
      name: "Alaska Standard Time (AT / Alaska Time)",
      iana: [
        "America/Anchorage",
        "America/Juneau",
        "America/Sitka",
        "America/Nome",
        "America/Yakutat",
      ],
      note: "UTC−9 standard time.",
    },
  ],

  ALMT: [
    {
      name: "Alma-Ata Time",
      iana: ["Asia/Almaty"],
      note: "UTC+6.",
    },
  ],

  // AMST is ambiguous: Amazon Summer (Brazil, historical) vs Armenia Summer (historical)
  AMST: [
    {
      name: "Amazon Summer Time",
      iana: ["America/Cuiaba", "America/Campo_Grande"],
      note: "UTC−3 (historical DST in parts of Brazil).",
    },
    {
      name: "Armenia Summer Time (AMDT / Armenia Daylight Time)",
      iana: ["Asia/Yerevan"],
      note: "UTC+5 (historical DST).",
    },
  ],

  // AMT is ambiguous: Amazon Time vs Armenia Time
  AMT: [
    {
      name: "Amazon Time",
      iana: ["America/Manaus", "America/Porto_Velho", "America/Boa_Vista"],
      note: "UTC−4 (northern/western Brazil).",
    },
    {
      name: "Armenia Time",
      iana: ["Asia/Yerevan"],
      note: "UTC+4.",
    },
  ],

  ANAST: [
    {
      name: "Anadyr Summer Time",
      iana: ["Asia/Anadyr"],
      note: "UTC+12 (historical DST; Russia abolished DST).",
    },
  ],

  ANAT: [
    {
      name: "Anadyr Time",
      iana: ["Asia/Anadyr"],
      note: "UTC+12 current standard time.",
    },
  ],

  AQTT: [
    {
      name: "Aqtobe Time",
      iana: ["Asia/Aqtobe"],
      note: "UTC+5.",
    },
  ],
  ART: [
    {
      name: "Argentina Time",
      iana: ["America/Argentina/Buenos_Aires"],
      note: "UTC−3; covers mainland Argentina.",
    },
  ],

  // AST is ambiguous: Arabia vs Atlantic
  AST: [
    {
      name: "Arabia Standard Time (Arabic/Al Manamah Standard Time)",
      iana: ["Asia/Riyadh", "Asia/Baghdad", "Asia/Bahrain", "Asia/Qatar", "Asia/Kuwait"],
      note: "UTC+3; no DST in most of the region.",
    },
    {
      name: "Atlantic Standard Time (AT / HNA / Tiempo Estándar del Atlántico)",
      iana: ["America/Halifax", "America/Barbados", "America/Puerto_Rico", "America/Curacao"],
      note: "UTC−4; Caribbean & Atlantic Canada (winter).",
    },
  ],

  AT: [
    {
      name: "Atlantic Time",
      iana: ["America/Halifax", "Atlantic/Bermuda"],
      note: "Region label; uses AST (UTC−4) / ADT (UTC−3) with DST.",
    },
  ],

  AWDT: [
    {
      name: "Australian Western Daylight Time (WDT/WST - Western Summer Time)",
      iana: ["Australia/Perth"],
      note: "UTC+9; historical/rare DST in Western Australia.",
    },
  ],

  AWST: [
    {
      name: "Australian Western Standard Time (WST/WAT - Western Australia Time)",
      iana: ["Australia/Perth"],
      note: "UTC+8.",
    },
  ],

  AZOST: [
    {
      name: "Azores Summer Time (AZODT)",
      iana: ["Atlantic/Azores"],
      note: "DST time; UTC±0 during summer.",
    },
  ],

  AZOT: [
    {
      name: "Azores Standard Time (AZOST)",
      iana: ["Atlantic/Azores"],
      note: "Standard time; UTC−1 in winter.",
    },
  ],

  AZST: [
    {
      name: "Azerbaijan Summer Time",
      iana: ["Asia/Baku"],
      note: "UTC+5; historical DST (Azerbaijan abolished DST in 2016).",
    },
  ],

  AZT: [
    {
      name: "Azerbaijan Time",
      iana: ["Asia/Baku"],
      note: "UTC+4; current standard time.",
    },
  ],

  AoE: [
    {
      name: "Anywhere on Earth",
      iana: ["Etc/GMT+12"],
      note: "Fixed UTC−12 (Etc sign is inverted: GMT+12 == UTC−12).",
    },
  ],
  B: [
    {
      name: "Bravo Time Zone (Military)",
      iana: ["Etc/GMT-2"],
      note: "Fixed offset; use for UTC+2. Military letters are deprecated in civil use.",
    },
  ],

  BNT: [
    {
      name: "Brunei Darussalam Time (BDT)",
      iana: ["Asia/Brunei"],
      note: "UTC+8.",
    },
  ],

  BOT: [
    {
      name: "Bolivia Time",
      iana: ["America/La_Paz"],
      note: "UTC−4.",
    },
  ],

  BRST: [
    {
      name: "Brasília Summer Time (Brazilian DST)",
      iana: ["America/Sao_Paulo"],
      note: "UTC−2 during historical DST; Brazil abolished DST (2019).",
    },
  ],

  BRT: [
    {
      name: "Brasília Time (Brazil Time)",
      iana: ["America/Sao_Paulo"],
      note: "UTC−3 current standard time.",
    },
  ],

  // BST is ambiguous: Bangladesh / Bougainville / British Summer
  BST: [
    {
      name: "Bangladesh Standard Time",
      iana: ["Asia/Dhaka"],
      note: "UTC+6.",
    },
    {
      name: "Bougainville Standard Time",
      iana: ["Pacific/Bougainville"],
      note: "UTC+11 (Papua New Guinea region).",
    },
    {
      name: "British Summer Time (BDT/BDST)",
      iana: ["Europe/London"],
      note: "UTC+1 during UK DST.",
    },
  ],

  BTT: [
    {
      name: "Bhutan Time",
      iana: ["Asia/Thimphu"],
      note: "UTC+6.",
    },
  ],

  // Military C: Etc/GMT-3 === UTC+3
  C: [
    {
      name: "Charlie Time Zone (Military)",
      iana: ["Etc/GMT-3"],
      note: "Fixed UTC+3.",
    },
  ],

  CAST: [
    {
      name: "Casey Time",
      iana: ["Antarctica/Casey"],
      note: "Station time; often UTC+8 (may change with operations).",
    },
  ],

  CAT: [
    {
      name: "Central Africa Time",
      iana: ["Africa/Maputo", "Africa/Harare", "Africa/Lusaka"],
      note: "UTC+2.",
    },
  ],

  CCT: [
    {
      name: "Cocos Islands Time",
      iana: ["Indian/Cocos"],
      note: "UTC+6:30.",
    },
  ],

  // CDT ambiguous: North American Central Daylight vs Cuba Daylight
  CDT: [
    {
      name:
        "Central Daylight Time (North America) / HAC (fr) / NACDT",
      iana: [
        "America/Chicago",
        "America/Winnipeg",
        "America/Mexico_City",
        "America/Guatemala",
      ],
      note: "UTC−5 during DST.",
    },
    {
      name: "Cuba Daylight Time",
      iana: ["America/Havana"],
      note: "UTC−4 during DST in Cuba.",
    },
  ],

  CEST: [
    {
      name:
        "Central European Summer Time (CEDT/ECST/MESZ)",
      iana: ["Europe/Berlin", "Europe/Paris", "Europe/Rome", "Europe/Madrid"],
      note: "UTC+2 during DST.",
    },
  ],

  CET: [
    {
      name:
        "Central European Time (ECT/MEZ)",
      iana: ["Europe/Berlin", "Europe/Paris", "Europe/Rome", "Europe/Madrid"],
      note: "UTC+1 standard time.",
    },
  ],

  CHADT: [
    {
      name: "Chatham Island Daylight Time (CDT)",
      iana: ["Pacific/Chatham"],
      note: "UTC+13:45 during DST.",
    },
  ],

  CHAST: [
    {
      name: "Chatham Island Standard Time",
      iana: ["Pacific/Chatham"],
      note: "UTC+12:45 standard time.",
    },
  ],

  CHOST: [
    {
      name:
        "Choibalsan Summer Time (CHODT/CHODST)",
      iana: ["Asia/Choibalsan"],
      note: "UTC+9 (historical DST).",
    },
  ],

  CHOT: [
    {
      name: "Choibalsan Time",
      iana: ["Asia/Choibalsan"],
      note: "UTC+8 current standard time.",
    },
  ],

  CHUT: [
    {
      name: "Chuuk Time",
      iana: ["Pacific/Chuuk"],
      note: "UTC+10.",
    },
  ],

  // Cayman Islands: currently no DST; CIDST is effectively historical/unused
  CIDST: [
    {
      name: "Cayman Islands Daylight Saving Time",
      iana: ["America/Cayman"],
      note: "No DST currently; kept for completeness.",
    },
  ],

  CIST: [
    {
      name: "Cayman Islands Standard Time (CIT)",
      iana: ["America/Cayman"],
      note: "UTC−5.",
    },
  ],

  CKT: [
    {
      name: "Cook Island Time",
      iana: ["Pacific/Rarotonga"],
      note: "UTC−10.",
    },
  ],

  CLST: [
    {
      name: "Chile Summer Time (CLDT)",
      iana: ["America/Santiago", "Antarctica/Palmer"],
      note: "UTC−3 during DST (mainland & Palmer Station).",
    },
  ],

  CLT: [
    {
      name: "Chile Standard Time (CLST label also seen historically)",
      iana: ["America/Santiago", "Antarctica/Palmer"],
      note: "UTC−4 standard time (mainland & Palmer Station).",
    },
  ],

  COT: [
    {
      name: "Colombia Time",
      iana: ["America/Bogota"],
      note: "UTC−5.",
    },
  ],

  // CST ambiguous: North American Central / China / Cuba
  CST: [
    {
      name:
        "Central Standard Time (North America) / NACST / HNC (fr)",
      iana: ["America/Chicago", "America/Winnipeg", "America/Guatemala"],
      note: "UTC−6 standard time.",
    },
    {
      name: "China Standard Time",
      iana: ["Asia/Shanghai", "Asia/Urumqi"],
      note: "UTC+8; single civil time across mainland China.",
    },
    {
      name: "Cuba Standard Time",
      iana: ["America/Havana"],
      note: "UTC−5 standard time in Cuba.",
    },
  ],

  CT: [
    {
      name: "Central Time (North America)",
      iana: ["America/Chicago", "America/Winnipeg", "America/Mexico_City"],
      note: "Region label; CST (UTC−6) / CDT (UTC−5) with DST.",
    },
  ],

  CVT: [
    {
      name: "Cape Verde Time",
      iana: ["Atlantic/Cape_Verde"],
      note: "UTC−1.",
    },
  ],

  CXT: [
    {
      name: "Christmas Island Time",
      iana: ["Indian/Christmas"],
      note: "UTC+7.",
    },
  ],

  // The common abbreviation is "ChST" (capital C, lowercase h)
  ChST: [
    {
      name: "Chamorro Standard Time (Guam Standard Time)",
      iana: ["Pacific/Guam", "Pacific/Saipan"],
      note: "UTC+10.",
    },
  ],
 D: [{ name: "Delta Time Zone (Military)", iana: ["Etc/GMT-4"], note: "Fixed UTC+4." }],

  DAVT: [{ name: "Davis Time", iana: ["Antarctica/Davis"], note: "Typically UTC+7." }],
  DDUT: [{ name: "Dumont-d'Urville Time", iana: ["Antarctica/DumontDUrville"], note: "UTC+10." }],

  E: [{ name: "Echo Time Zone (Military)", iana: ["Etc/GMT-5"], note: "Fixed UTC+5." }],

  EASST: [{ name: "Easter Island Summer Time (EADT)", iana: ["Pacific/Easter"], note: "UTC−5 during DST." }],
  EAST:  [{ name: "Easter Island Standard Time", iana: ["Pacific/Easter"], note: "UTC−6 standard." }],

  EAT: [
    {
      name: "Eastern Africa Time",
      iana: ["Africa/Nairobi", "Africa/Addis_Ababa", "Africa/Dar_es_Salaam"],
      note: "UTC+3, no DST."
    },
  ],

  ECT: [{ name: "Ecuador Time", iana: ["America/Guayaquil"], note: "UTC−5 (mainland)." }],

  EDT: [
    {
      name: "Eastern Daylight Time (North America/Caribbean)",
      iana: ["America/New_York", "America/Toronto", "America/Nassau", "America/Port-au-Prince"],
      note: "UTC−4 during DST."
    },
  ],

  EEST: [
    {
      name: "Eastern European Summer Time",
      iana: ["Europe/Kyiv", "Europe/Athens", "Europe/Bucharest", "Asia/Beirut"],
      note: "UTC+3 during DST."
    },
  ],

  EET: [
    {
      name: "Eastern European Time",
      iana: ["Europe/Kyiv", "Europe/Athens", "Europe/Bucharest", "Asia/Nicosia"],
      note: "UTC+2 standard."
    },
  ],

  EGST: [{ name: "Eastern Greenland Summer Time", iana: ["America/Scoresbysund"], note: "UTC±0 during DST." }],
  EGT:  [{ name: "East Greenland Time", iana: ["America/Scoresbysund"], note: "UTC−1 standard." }],

  EST: [
    {
      name: "Eastern Standard Time (North America/Caribbean/Central America)",
      iana: ["America/New_York", "America/Toronto", "America/Panama", "America/Jamaica"],
      note: "UTC−5 standard."
    },
  ],

  ET: [
    {
      name: "Eastern Time (region label)",
      iana: ["America/New_York", "America/Toronto"],
      note: "Covers EST (UTC−5) / EDT (UTC−4)."
    },
  ],

  F: [{ name: "Foxtrot Time Zone (Military)", iana: ["Etc/GMT-6"], note: "Fixed UTC+6." }],

  FET: [{ name: "Further-Eastern European Time", iana: ["Europe/Minsk"], note: "UTC+3; no DST." }],

  FJST: [{ name: "Fiji Summer Time", iana: ["Pacific/Fiji"], note: "UTC+13 during DST (intermittent policy)." }],
  FJT:  [{ name: "Fiji Time", iana: ["Pacific/Fiji"], note: "UTC+12 standard." }],

  FKST: [{ name: "Falkland Islands Summer Time", iana: ["Atlantic/Stanley"], note: "UTC−3 during DST (historical usage)." }],
  FKT:  [{ name: "Falkland Island Time (Standard)", iana: ["Atlantic/Stanley"], note: "UTC−4 standard (historical)." }],

  FNT: [{ name: "Fernando de Noronha Time", iana: ["America/Noronha"], note: "UTC−2." }],

  G: [{ name: "Golf Time Zone (Military)", iana: ["Etc/GMT-7"], note: "Fixed UTC+7." }],

  GALT: [{ name: "Galapagos Time", iana: ["Pacific/Galapagos"], note: "UTC−6 (Galápagos Islands)." }],
  GAMT: [{ name: "Gambier Time", iana: ["Pacific/Gambier"], note: "UTC−9." }],

  GET: [{ name: "Georgia Standard Time", iana: ["Asia/Tbilisi"], note: "UTC+4." }],
  GFT: [{ name: "French Guiana Time", iana: ["America/Cayenne"], note: "UTC−3." }],
  GILT:[{ name: "Gilbert Island Time", iana: ["Pacific/Tarawa"], note: "UTC+12." }],

  GMT: [
    {
      name: "Greenwich Mean Time / UTC",
      iana: ["Etc/UTC", "Etc/GMT"],
      note: "UTC±0; use Etc/UTC as canonical."
    },
  ],

  // GST ambiguous: Gulf (UTC+4) vs South Georgia (UTC−2)
  GST: [
    { name: "Gulf Standard Time", iana: ["Asia/Dubai", "Asia/Muscat"], note: "UTC+4; no DST." },
    { name: "South Georgia Time", iana: ["Atlantic/South_Georgia"], note: "UTC−2." },
  ],

  GYT: [{ name: "Guyana Time", iana: ["America/Guyana"], note: "UTC−4." }],

  H: [{ name: "Hotel Time Zone (Military)", iana: ["Etc/GMT-8"], note: "Fixed UTC+8." }],

  HDT: [
    {
      name: "Hawaii-Aleutian Daylight Time",
      iana: ["America/Adak"],
      note: "UTC−9 during DST in Aleutians; Hawaii proper does not use DST."
    },
  ],

  HKT: [{ name: "Hong Kong Time", iana: ["Asia/Hong_Kong"], note: "UTC+8." }],

  HOVST: [{ name: "Hovd Summer Time", iana: ["Asia/Hovd"], note: "UTC+8 (historical DST, Mongolia)." }],
  HOVT:  [{ name: "Hovd Time", iana: ["Asia/Hovd"], note: "UTC+7 standard (Mongolia)." }],

  HST: [
    {
      name: "Hawaii Standard Time (HAST/Hawaii–Aleutian Standard)",
      iana: ["Pacific/Honolulu", "America/Adak"],
      note: "UTC−10; Hawaii year-round, Aleutians in winter."
    },
  ],

  I: [{ name: "India Time Zone (Military)", iana: ["Etc/GMT-9"], note: "Fixed UTC+9." }],

  ICT: [{ name: "Indochina Time", iana: ["Asia/Bangkok", "Asia/Ho_Chi_Minh", "Asia/Phnom_Penh", "Asia/Vientiane"], note: "UTC+7." }],

  IDT: [{ name: "Israel Daylight Time", iana: ["Asia/Jerusalem"], note: "UTC+3 during DST." }],

  IOT: [{ name: "Indian Chagos Time", iana: ["Indian/Chagos"], note: "UTC+6." }],

  IRDT: [
    {
      name: "Iran Daylight Time (Iran Summer Time)",
      iana: ["Asia/Tehran"],
      note: "UTC+4:30 during DST (historical/periodic policy)."
    },
  ],

  IRKST: [{ name: "Irkutsk Summer Time", iana: ["Asia/Irkutsk"], note: "UTC+9 (historical DST)." }],
  IRKT:  [{ name: "Irkutsk Time", iana: ["Asia/Irkutsk"], note: "UTC+8 current." }],

  IRST: [{ name: "Iran Standard Time", iana: ["Asia/Tehran"], note: "UTC+3:30." }],

  // IST is highly ambiguous: India / Ireland / Israel
  IST: [
    { name: "India Standard Time",  iana: ["Asia/Kolkata"],   note: "UTC+5:30." },
    { name: "Irish Standard/Summer Time", iana: ["Europe/Dublin"], note: "UTC+1 during DST." },
    { name: "Israel Standard Time", iana: ["Asia/Jerusalem"], note: "UTC+2 standard." },
  ],

  JST: [{ name: "Japan Standard Time", iana: ["Asia/Tokyo"], note: "UTC+9." }],
  K:   [{ name: "Kilo Time Zone (Military)", iana: ["Etc/GMT-10"], note: "Fixed UTC+10." }],

  KGT: [{ name: "Kyrgyzstan Time", iana: ["Asia/Bishkek"], note: "UTC+6." }],
  KOST:[{ name: "Kosrae Time", iana: ["Pacific/Kosrae"], note: "UTC+11." }],

  KRAST: [{ name: "Krasnoyarsk Summer Time", iana: ["Asia/Krasnoyarsk"], note: "UTC+8 (historical DST)." }],
  KRAT:  [{ name: "Krasnoyarsk Time", iana: ["Asia/Krasnoyarsk"], note: "UTC+7 current." }],

  KST: [{ name: "Korea Standard Time", iana: ["Asia/Seoul"], note: "UTC+9." }],

  KUYT: [{ name: "Kuybyshev Time (Samara)", iana: ["Europe/Samara"], note: "UTC+4; modern Samara time." }],

  L: [{ name: "Lima Time Zone (Military)", iana: ["Etc/GMT-11"], note: "Fixed UTC+11." }],

  LHDT: [{ name: "Lord Howe Daylight Time", iana: ["Australia/Lord_Howe"], note: "UTC+11 during DST." }],
  LHST: [{ name: "Lord Howe Standard Time", iana: ["Australia/Lord_Howe"], note: "UTC+10:30 standard." }],

  LINT: [{ name: "Line Islands Time", iana: ["Pacific/Kiritimati"], note: "UTC+14." }],

  M: [{ name: "Mike Time Zone (Military)", iana: ["Etc/GMT-12"], note: "Fixed UTC+12." }],

  MAGST: [{ name: "Magadan Summer Time", iana: ["Asia/Magadan"], note: "UTC+12 (historical DST)." }],
  MAGT:  [{ name: "Magadan Time", iana: ["Asia/Magadan"], note: "UTC+11 current." }],

  MART: [{ name: "Marquesas Time", iana: ["Pacific/Marquesas"], note: "UTC−9:30." }],

  MAWT: [{ name: "Mawson Time", iana: ["Antarctica/Mawson"], note: "UTC+5." }],

  MDT: [
    {
      name: "Mountain Daylight Time (North America)",
      iana: ["America/Denver", "America/Edmonton"],
      note: "UTC−6 during DST. (Phoenix does not observe DST.)"
    },
  ],

  MHT: [{ name: "Marshall Islands Time", iana: ["Pacific/Majuro", "Pacific/Kwajalein"], note: "UTC+12." }],

  MMT: [{ name: "Myanmar Time", iana: ["Asia/Yangon"], note: "UTC+6:30." }],

  MSD: [{ name: "Moscow Daylight Time", iana: ["Europe/Moscow"], note: "UTC+4 (historical DST)." }],
  MSK: [{ name: "Moscow Standard Time", iana: ["Europe/Moscow"], note: "UTC+3 current." }],

  MST: [
    {
      name: "Mountain Standard Time (North America)",
      iana: ["America/Denver", "America/Phoenix"],
      note: "UTC−7 standard; Phoenix is year-round MST."
    },
  ],

  MT: [
    {
      name: "Mountain Time (region label)",
      iana: ["America/Denver", "America/Edmonton"],
      note: "Covers MST (UTC−7) / MDT (UTC−6)."
    },
  ],

  MUT: [{ name: "Mauritius Time", iana: ["Indian/Mauritius"], note: "UTC+4." }],
  MVT: [{ name: "Maldives Time",  iana: ["Indian/Maldives"],  note: "UTC+5." }],

  MYT: [{ name: "Malaysia Time (Malaysian Standard Time)", iana: ["Asia/Kuala_Lumpur", "Asia/Kuching"], note: "UTC+8." }],

  // Military N: Etc/GMT+1 === UTC−1
  N:   [{ name: "November Time Zone (Military)", iana: ["Etc/GMT+1"], note: "Fixed UTC−1." }],

  NCT: [{ name: "New Caledonia Time", iana: ["Pacific/Noumea"], note: "UTC+11." }],

  NDT: [{ name: "Newfoundland Daylight Time", iana: ["America/St_Johns"], note: "UTC−2:30 during DST." }],
  NFDT:[{ name: "Norfolk Daylight Time", iana: ["Pacific/Norfolk"], note: "UTC+12 during historical DST." }],

  NFT: [{ name: "Norfolk Time (Norfolk Island Time)", iana: ["Pacific/Norfolk"], note: "UTC+11 standard (policy changed over years)." }],

  NOVST: [
    { name: "Novosibirsk Summer Time", iana: ["Asia/Novosibirsk"], note: "UTC+7 (historical DST)." },
    { name: "Omsk Summer Time",       iana: ["Asia/Omsk"],        note: "Historical DST in Omsk region." },
  ],

  NOVT: [
    { name: "Novosibirsk Time", iana: ["Asia/Novosibirsk"], note: "UTC+7 current." },
    { name: "Omsk Standard Time", iana: ["Asia/Omsk"],      note: "Today UTC+6; label historically varied." },
  ],

  NPT: [{ name: "Nepal Time",  iana: ["Asia/Kathmandu"], note: "UTC+5:45." }],
  NRT: [{ name: "Nauru Time",  iana: ["Pacific/Nauru"],  note: "UTC+12." }],

  NST: [{ name: "Newfoundland Standard Time", iana: ["America/St_Johns"], note: "UTC−3:30 standard." }],

  NUT: [{ name: "Niue Time", iana: ["Pacific/Niue"], note: "UTC−11." }],

  NZDT: [{ name: "New Zealand Daylight Time", iana: ["Pacific/Auckland", "Antarctica/McMurdo"], note: "UTC+13 during DST." }],
  NZST: [{ name: "New Zealand Standard Time", iana: ["Pacific/Auckland", "Antarctica/McMurdo"], note: "UTC+12 standard." }],
 // Military letters (Etc/GMT sign is inverted: Etc/GMT+2 === UTC−2)
  O: [{ name: "Oscar Time Zone (Military)", iana: ["Etc/GMT+2"], note: "Fixed UTC−2." }],

  OMSST: [{ name: "Omsk Summer Time (Novosibirsk Summer Time)", iana: ["Asia/Omsk"], note: "Historical DST ~UTC+7." }],
  OMST:  [{ name: "Omsk Standard Time", iana: ["Asia/Omsk"], note: "UTC+6 current." }],

  ORAT: [{ name: "Oral Time", iana: ["Asia/Oral"], note: "UTC+5 (Kazakhstan)." }],

  P: [{ name: "Papa Time Zone (Military)", iana: ["Etc/GMT+3"], note: "Fixed UTC−3." }],

  PDT: [{
    name: "Pacific Daylight Time (North America)",
    iana: ["America/Los_Angeles", "America/Vancouver", "America/Tijuana"],
    note: "UTC−7 during DST."
  }],

  PET:  [{ name: "Peru Time", iana: ["America/Lima"], note: "UTC−5." }],

  // PETST (Kamchatka Summer) historically UTC+13; Russia no longer uses DST
  PETST: [{ name: "Kamchatka Summer Time", iana: ["Asia/Kamchatka"], note: "Historical DST (~UTC+13)." }],
  PETT:  [{ name: "Kamchatka Time", iana: ["Asia/Kamchatka"], note: "UTC+12 current." }],

  PGT:  [{ name: "Papua New Guinea Time", iana: ["Pacific/Port_Moresby"], note: "UTC+10 (Bougainville uses UTC+11)." }],

  PHOT: [{ name: "Phoenix Island Time", iana: ["Pacific/Kanton"], note: "UTC+13." }],
  PHT:  [{ name: "Philippine Time (Philippine Standard Time)", iana: ["Asia/Manila"], note: "UTC+8." }],
  PKT:  [{ name: "Pakistan Standard Time", iana: ["Asia/Karachi"], note: "UTC+5." }],

  PMDT: [{ name: "Saint Pierre & Miquelon Daylight Time", iana: ["America/Miquelon"], note: "UTC−2 during DST." }],
  PMST: [{ name: "Saint Pierre & Miquelon Standard Time", iana: ["America/Miquelon"], note: "UTC−3 standard." }],

  PONT: [{ name: "Pohnpei Standard Time", iana: ["Pacific/Pohnpei"], note: "UTC+11." }],

  // PST ambiguous: Pacific (North America) vs Pitcairn
  PST: [
    {
      name: "Pacific Standard Time (North America)",
      iana: ["America/Los_Angeles", "America/Vancouver", "America/Tijuana"],
      note: "UTC−8 standard."
    },
    {
      name: "Pitcairn Standard Time",
      iana: ["Pacific/Pitcairn"],
      note: "UTC−8 (Pitcairn Islands)."
    },
  ],

  PT: [{
    name: "Pacific Time (region label)",
    iana: ["America/Los_Angeles", "America/Vancouver"],
    note: "Covers PST (UTC−8) / PDT (UTC−7)."
  }],

  PWT: [{ name: "Palau Time", iana: ["Pacific/Palau"], note: "UTC+9." }],

  PYST: [{ name: "Paraguay Summer Time", iana: ["America/Asuncion"], note: "UTC−3 during DST (policy has varied)." }],

  // PYT ambiguous: Paraguay vs Pyongyang (historical)
  PYT: [
    { name: "Paraguay Time", iana: ["America/Asuncion"], note: "UTC−4 standard. (Иногда источник указывает −3 — это летнее время PYST.)" },
    { name: "Pyongyang Time", iana: ["Asia/Pyongyang"], note: "UTC+8:30 (2015–2018); сейчас КНДР использует UTC+9 (KST)." },
  ],

  Q: [{ name: "Quebec Time Zone (Military)", iana: ["Etc/GMT+4"], note: "Fixed UTC−4." }],

  // Qyzylorda moved to UTC+5 in 2018
  QYZT: [{ name: "Qyzylorda Time", iana: ["Asia/Qyzylorda"], note: "UTC+5 current; historical UTC+6." }],

  R: [{ name: "Romeo Time Zone (Military)", iana: ["Etc/GMT+5"], note: "Fixed UTC−5." }],

  RET:  [{ name: "Réunion Time", iana: ["Indian/Reunion"], note: "UTC+4." }],
  ROTT: [{ name: "Rothera Time", iana: ["Antarctica/Rothera"], note: "UTC−3 (British Antarctic Survey)." }],

  S: [{ name: "Sierra Time Zone (Military)", iana: ["Etc/GMT+6"], note: "Fixed UTC−6." }],

  SAKT: [{ name: "Sakhalin Time", iana: ["Asia/Sakhalin"], note: "UTC+11." }],
  SAMT: [{ name: "Samara Time", iana: ["Europe/Samara"], note: "UTC+4." }],

  SAST: [{ name: "South Africa Standard Time", iana: ["Africa/Johannesburg"], note: "UTC+2." }],

  SBT:  [{ name: "Solomon Islands Time", iana: ["Pacific/Guadalcanal"], note: "UTC+11." }],
  SCT:  [{ name: "Seychelles Time", iana: ["Indian/Mahe"], note: "UTC+4." }],
  SGT:  [{ name: "Singapore Time (Singapore Standard Time)", iana: ["Asia/Singapore"], note: "UTC+8." }],

  SRET: [{ name: "Srednekolymsk Time", iana: ["Asia/Srednekolymsk"], note: "UTC+11." }],

  SRT:  [{ name: "Suriname Time", iana: ["America/Paramaribo"], note: "UTC−3." }],

  SST:  [{ name: "Samoa Standard Time", iana: ["Pacific/Pago_Pago"], note: "UTC−11." }],

  SYOT: [{ name: "Syowa Time", iana: ["Antarctica/Syowa"], note: "UTC+3 (Japan's Syowa Station)." }],

  T: [{ name: "Tango Time Zone (Military)", iana: ["Etc/GMT+7"], note: "Fixed UTC−7." }],
 TAHT: [{ name: "Tahiti Time", iana: ["Pacific/Tahiti"], note: "UTC−10." }],

  TFT:  [{ name: "French Southern and Antarctic Time (Kerguelen)", iana: ["Indian/Kerguelen"], note: "UTC+5." }],

  TJT:  [{ name: "Tajikistan Time", iana: ["Asia/Dushanbe"], note: "UTC+5." }],
  TKT:  [{ name: "Tokelau Time", iana: ["Pacific/Fakaofo"], note: "UTC+13." }],
  TLT:  [{ name: "East Timor Time", iana: ["Asia/Dili"], note: "UTC+9." }],
  TMT:  [{ name: "Turkmenistan Time", iana: ["Asia/Ashgabat"], note: "UTC+5." }],

  TOST: [{ name: "Tonga Summer Time", iana: ["Pacific/Tongatapu"], note: "UTC+14 during DST (historical/policy-based)." }],
  TOT:  [{ name: "Tonga Time", iana: ["Pacific/Tongatapu"], note: "UTC+13." }],

  TRT:  [{ name: "Turkey Time", iana: ["Europe/Istanbul"], note: "UTC+3 year-round since 2016." }],

  TVT:  [{ name: "Tuvalu Time", iana: ["Pacific/Funafuti"], note: "UTC+12." }],

  // Military letters (Etc/GMT sign is inverted: Etc/GMT+8 === UTC−8)
  U:    [{ name: "Uniform Time Zone (Military)", iana: ["Etc/GMT+8"], note: "Fixed UTC−8." }],

  ULAST:[{ name: "Ulaanbaatar Summer Time", iana: ["Asia/Ulaanbaatar"], note: "UTC+9 (historical DST)." }],
  ULAT: [{ name: "Ulaanbaatar Time", iana: ["Asia/Ulaanbaatar"], note: "UTC+8." }],

  UTC:  [{ name: "Coordinated Universal Time", iana: ["Etc/UTC"], note: "UTC±0; canonical base." }],

  UYST: [{ name: "Uruguay Summer Time", iana: ["America/Montevideo"], note: "UTC−2 (historical DST)." }],
  UYT:  [{ name: "Uruguay Time", iana: ["America/Montevideo"], note: "UTC−3." }],

  UZT:  [{ name: "Uzbekistan Time", iana: ["Asia/Tashkent"], note: "UTC+5." }],

  // Military letters (Etc/GMT+9 === UTC−9)
  V:    [{ name: "Victor Time Zone (Military)", iana: ["Etc/GMT+9"], note: "Fixed UTC−9." }],

  VET:  [{ name: "Venezuelan Standard Time", iana: ["America/Caracas"], note: "UTC−4 (since 2016)." }],

  VLAST:[{ name: "Vladivostok Summer Time", iana: ["Asia/Vladivostok"], note: "UTC+11 (historical DST)." }],
  VLAT: [{ name: "Vladivostok Time", iana: ["Asia/Vladivostok"], note: "UTC+10 current." }],

  VOST: [{ name: "Vostok Time", iana: ["Antarctica/Vostok"], note: "UTC+6." }],

  VUT:  [{ name: "Vanuatu Time (Efate)", iana: ["Pacific/Efate"], note: "UTC+11." }],

  // Military letters (Etc/GMT+10 === UTC−10)
  W:    [{ name: "Whiskey Time Zone (Military)", iana: ["Etc/GMT+10"], note: "Fixed UTC−10." }],

  WAKT: [{ name: "Wake Time", iana: ["Pacific/Wake"], note: "UTC+12." }],

  WARST:[{ name: "Western Argentine Summer Time", iana: ["America/Argentina/San_Luis"], note: "UTC−3 (historical DST in western provinces)." }],

  // Namibia used DST historically (WAST); today Africa/Windhoek stays UTC+2
  WAST: [{ name: "West Africa Summer Time", iana: ["Africa/Windhoek"], note: "Historical DST designation." }],

  WAT:  [{ name: "West Africa Time", iana: ["Africa/Lagos", "Africa/Luanda", "Africa/Libreville"], note: "UTC+1." }],

  WEST: [{ name: "Western European Summer Time", iana: ["Europe/Lisbon", "Atlantic/Canary", "Atlantic/Madeira"], note: "UTC+1 during DST." }],
  WET:  [{ name: "Western European Time (GMT)", iana: ["Europe/Lisbon", "Atlantic/Canary", "Atlantic/Madeira"], note: "UTC±0 standard." }],

  WFT:  [{ name: "Wallis and Futuna Time", iana: ["Pacific/Wallis"], note: "UTC+12." }],

  // Greenland (West): standard WGT UTC−3; DST WGST UTC−2
  WGST: [{ name: "Western Greenland Summer Time", iana: ["America/Nuuk"], note: "UTC−2 during DST (policy changes in 2019)." }],
  WGT:  [{ name: "Western Greenland Time", iana: ["America/Nuuk"], note: "UTC−3 standard." }],

  WIB:  [{ name: "Western Indonesian Time (Waktu Indonesia Barat)", iana: ["Asia/Jakarta", "Asia/Pontianak"], note: "UTC+7." }],
  WIT:  [{ name: "Eastern Indonesian Time (Waktu Indonesia Timur)", iana: ["Asia/Jayapura"], note: "UTC+9." }],
  WITA: [{ name: "Central Indonesian Time (Waktu Indonesia Tengah)", iana: ["Asia/Makassar", "Asia/Denpasar"], note: "UTC+8." }],

  // Samoa: present-day Pacific/Apia (policy shifted; UTC+13 standard, DST intermittent)
  WST: [
    { name: "West Samoa Time (Samoa Time)", iana: ["Pacific/Apia"], note: "UTC+13 standard; DST policies varied." },
    { name: "Western Sahara Summer Time", iana: ["Africa/El_Aaiun"], note: "UTC+1 (historical/seasonal policy)." },
  ],

  WT:   [{ name: "Western Sahara Standard Time", iana: ["Africa/El_Aaiun"], note: "UTC±0 standard." }],

  // Military letters
  X:    [{ name: "X-ray Time Zone (Military)", iana: ["Etc/GMT+11"], note: "Fixed UTC−11." }],
  Y:    [{ name: "Yankee Time Zone (Military)", iana: ["Etc/GMT+12"], note: "Fixed UTC−12." }],

  YAKST:[{ name: "Yakutsk Summer Time", iana: ["Asia/Yakutsk"], note: "UTC+10 (historical DST)." }],
  YAKT: [{ name: "Yakutsk Time", iana: ["Asia/Yakutsk"], note: "UTC+9 current." }],

  YAPT: [{ name: "Yap Time", iana: ["Pacific/Yap"], note: "UTC+10." }],

  YEKST:[{ name: "Yekaterinburg Summer Time", iana: ["Asia/Yekaterinburg"], note: "UTC+6 (historical DST)." }],
  YEKT: [{ name: "Yekaterinburg Time", iana: ["Asia/Yekaterinburg"], note: "UTC+5 current." }],

  // Military Zulu
  Z:    [{ name: "Zulu Time Zone (Military)", iana: ["Etc/UTC"], note: "UTC±0; same as UTC." }],
 } as const;