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All Time Zones, ever

May 18, 2024~3 mins read time

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How many time zones exist?

There is a total of 400+ registered time zones, as accounted on a per country/naming basis. Only about 38 of those are unique.



Why do we have repeat time zones?

You may have noticed the existence of multiple time zones that appear to have the same offset and abbreviation. For example America/Belize, America/Guatemala, and America/Managua, America/Mexico_City, America/Costa_Rica, America/El_Salvador, America/Regina, America/Tegucigalpa all using Central Standard Time (CST). This can be attributed to several practical and administrative reasons:


  • Regional Identity and Autonomy

    Each country prefers to have a time zone identifier that reflects its national identity. Even though Belize, Guatemala, and Nicaragua share the same CST time, they use distinct identifiers to emphasize their sovereignty and unique national context.

  • Administrative and Technical Precision

    In computing and international systems, having distinct identifiers for time zones helps avoid ambiguity. For instance, "America/Belize" clearly indicates the time zone specific to Belize, which can be important for software systems, scheduling, and global coordination.

  • Daylight Saving Time (DST)

    Although countries may share the same base time zone, their observance of DST can differ. Separate identifiers allow for accurate representation of these variations. For example, one country might observe DST while another does not.

  • Historical and Political Context

    Historical reasons also play a role. Time zones might have been established independently during different periods, reflecting historical political boundaries and agreements. Political boundaries often influence time zone designations. Even if countries are geographically close, distinct time zone identifiers respect their political and administrative boundaries.

  • Regional Administration

    For administrative purposes, it is often more practical to have a unique time zone designation for each country or region. This helps local governments, businesses, and citizens to coordinate activities more efficiently.

  • Standardization Bodies

    International bodies like the International Telecommunication Union (ITU) and the Internet Assigned Numbers Authority (IANA) create and maintain time zone databases that require unique identifiers for clarity and precision. The IANA Time Zone Database, for instance, includes specific entries for different regions to facilitate accurate global timekeeping.



Why do we have more than 24 unique time zones?

Even so, there should only be 24 unique time zones. The Earth is a sphere (not a perfect one according to NASA), with 360 degrees in longitude. As it rotates on its axis, it creates night and day periods, based on the sun's exposure. That rotation process takes 24 hours, so that’s the length of a day.


Therefore, that would make an even 24 time zones,  each 1 hour apart. However, we have separated the earth into countries, each with its own culture and politics, which is were things get complicated (read more here).


A list of all time zones, the associated country, abbreviation and raw offset -not accounting for DTS-



TZ NameCountryAbrvRaw Offset
Pacific/NiueNiueNUT-11h 0m
Pacific/MidwayUnited States Minor Outlying IslandsSST-11h 0m
Pacific/Pago_PagoAmerican SamoaSST-11h 0m
Pacific/RarotongaCook IslandsCKT-10h 0m
Pacific/HonoluluUnited StatesHAST-10h 0m
Pacific/TahitiFrench PolynesiaTAHT-10h 0m
Pacific/MarquesasFrench PolynesiaMART-9h -30m
Pacific/GambierFrench PolynesiaGAMT-9h 0m
America/AdakUnited StatesHAST-10h 0m
America/AnchorageUnited StatesAKST-9h 0m
Pacific/PitcairnPitcairnPST-8h 0m
America/HermosilloMexicoGMT-7-7h 0m
America/PhoenixUnited StatesMST-7h 0m
America/Los_AngelesUnited StatesPST-8h 0m
America/TijuanaMexicoPST-8h 0m
America/VancouverCanadaPST-8h 0m
America/WhitehorseCanadaYT-7h 0m
America/BelizeBelizeCST-6h 0m
America/GuatemalaGuatemalaCST-6h 0m
America/ManaguaNicaraguaCST-6h 0m
America/Mexico_CityMexicoCST-6h 0m
America/Costa_RicaCosta RicaCST-6h 0m
America/El_SalvadorEl SalvadorCST-6h 0m
America/ReginaCanadaCST-6h 0m
America/TegucigalpaHondurasCST-6h 0m
Pacific/EasterChileEAST-6h 0m
Pacific/GalapagosEcuadorGALT-6h 0m
America/EdmontonCanadaMST-7h 0m
America/Ciudad_JuarezMexicoMST-7h 0m
America/DenverUnited StatesMST-7h 0m
America/Rio_BrancoBrazilACT-5h 0m
America/ChicagoUnited StatesCST-6h 0m
America/MatamorosMexicoCST-6h 0m
America/WinnipegCanadaCST-6h 0m
America/BogotaColombiaCOT-5h 0m
America/AtikokanCanadaEST-5h 0m
America/CancunMexicoEST-5h 0m
America/CaymanCayman IslandsEST-5h 0m
America/JamaicaJamaicaEST-5h 0m
America/PanamaPanamaEST-5h 0m
America/GuayaquilEcuadorECT-5h 0m
America/LimaPeruPET-5h 0m
America/ManausBrazilAMT-4h 0m
America/St_KittsSaint Kitts and NevisAST-4h 0m
America/Blanc-SablonCanadaAST-4h 0m
America/MontserratMontserratAST-4h 0m
America/BarbadosBarbadosAST-4h 0m
America/St_LuciaSaint LuciaAST-4h 0m
America/Port_of_SpainTrinidad and TobagoAST-4h 0m
America/MartiniqueMartiniqueAST-4h 0m
America/St_BarthelemySaint BarthelemyAST-4h 0m
America/St_VincentSaint Vincent and the GrenadinesAST-4h 0m
America/KralendijkBonaire, Saint Eustatius and Saba AST-4h 0m
America/GuadeloupeGuadeloupeAST-4h 0m
America/MarigotSaint MartinAST-4h 0m
America/ArubaArubaAST-4h 0m
America/Lower_PrincesSint MaartenAST-4h 0m
America/TortolaBritish Virgin IslandsAST-4h 0m
America/DominicaDominicaAST-4h 0m
America/St_ThomasU.S. Virgin IslandsAST-4h 0m
America/GrenadaGrenadaAST-4h 0m
America/AntiguaAntigua and BarbudaAST-4h 0m
America/Puerto_RicoPuerto RicoAST-4h 0m
America/Santo_DomingoDominican RepublicAST-4h 0m
America/AnguillaAnguillaAST-4h 0m
America/CuracaoCuracaoAST-4h 0m
America/La_PazBoliviaBOT-4h 0m
America/SantiagoChileCLT-4h 0m
America/HavanaCubaCST-5h 0m
America/Grand_TurkTurks and Caicos IslandsEST-5h 0m
America/NassauBahamasEST-5h 0m
America/New_YorkUnited StatesEST-5h 0m
America/Port-au-PrinceHaitiEST-5h 0m
America/TorontoCanadaEST-5h 0m
America/GuyanaGuyanaGYT-4h 0m
America/AsuncionParaguayPYT-4h 0m
America/CaracasVenezuelaVET-4h 0m
America/Argentina/Buenos_AiresArgentinaART-3h 0m
America/HalifaxCanadaAST-4h 0m
Atlantic/BermudaBermudaAST-4h 0m
America/ThuleGreenlandAST-4h 0m
America/Sao_PauloBrazilBRT-3h 0m
Antarctica/PalmerAntarcticaCLT-3h 0m
America/Punta_ArenasChileCLT-3h 0m
Atlantic/StanleyFalkland IslandsFKST-3h 0m
America/CayenneFrench GuianaGFT-3h 0m
America/ParamariboSurinameSRT-3h 0m
America/MontevideoUruguayUYT-3h 0m
America/St_JohnsCanadaNST-3h -30m
America/NoronhaBrazilFNT-2h 0m
Atlantic/South_GeorgiaSouth Georgia and the South Sandwich IslandsGST-2h 0m
America/MiquelonSaint Pierre and MiquelonPM-3h 0m
Atlantic/Cape_VerdeCabo VerdeCVT-1h 0m
America/NuukGreenlandWGT-2h 0m
Atlantic/AzoresPortugalAZOT-1h 0m
Etc/UTCUTC0h 0m
America/ScoresbysundGreenlandEGT-1h 0m
Africa/AbidjanIvory CoastGMT0h 0m
Africa/BamakoMaliGMT0h 0m
Africa/BissauGuinea-BissauGMT0h 0m
Africa/ConakryGuineaGMT0h 0m
Africa/DakarSenegalGMT0h 0m
America/DanmarkshavnGreenlandGMT0h 0m
Africa/FreetownSierra LeoneGMT0h 0m
Atlantic/St_HelenaSaint HelenaGMT0h 0m
Africa/AccraGhanaGMT0h 0m
Africa/LomeTogoGMT0h 0m
Africa/MonroviaLiberiaGMT0h 0m
Africa/NouakchottMauritaniaGMT0h 0m
Africa/OuagadougouBurkina FasoGMT0h 0m
Atlantic/ReykjavikIcelandGMT0h 0m
Africa/Sao_TomeSao Tome and PrincipeGMT0h 0m
Africa/BanjulGambiaGMT0h 0m
Africa/AlgiersAlgeriaCET1h 0m
Africa/TunisTunisiaCET1h 0m
Europe/Isle_of_ManIsle of ManGMT0h 0m
Europe/DublinIrelandGMT0h 0m
Europe/LondonUnited KingdomGMT0h 0m
Europe/JerseyJerseyGMT0h 0m
Europe/GuernseyGuernseyGMT0h 0m
Africa/BanguiCentral African RepublicWAT1h 0m
Africa/MalaboEquatorial GuineaWAT1h 0m
Africa/BrazzavilleRepublic of the CongoWAT1h 0m
Africa/Porto-NovoBeninWAT1h 0m
Africa/DoualaCameroonWAT1h 0m
Africa/KinshasaDemocratic Republic of the CongoWAT1h 0m
Africa/LagosNigeriaWAT1h 0m
Africa/LibrevilleGabonWAT1h 0m
Africa/LuandaAngolaWAT1h 0m
Africa/NdjamenaChadWAT1h 0m
Africa/NiameyNigerWAT1h 0m
Africa/CasablancaMoroccoWET0h 0m
Africa/El_AaiunWestern SaharaWET0h 0m
Atlantic/CanarySpainWET0h 0m
Europe/LisbonPortugalWET0h 0m
Atlantic/FaroeFaroe IslandsWET0h 0m
Africa/BujumburaBurundiCAT2h 0m
Africa/GaboroneBotswanaCAT2h 0m
Africa/HarareZimbabweCAT2h 0m
Africa/JubaSouth SudanCAT2h 0m
Africa/KhartoumSudanCAT2h 0m
Africa/KigaliRwandaCAT2h 0m
Africa/BlantyreMalawiCAT2h 0m
Africa/LubumbashiDemocratic Republic of the CongoCAT2h 0m
Africa/LusakaZambiaCAT2h 0m
Africa/MaputoMozambiqueCAT2h 0m
Africa/WindhoekNamibiaCAT1h 0m
Europe/AmsterdamThe NetherlandsCET1h 0m
Europe/AndorraAndorraCET1h 0m
Europe/BelgradeSerbiaCET1h 0m
Europe/BerlinGermanyCET1h 0m
Europe/BratislavaSlovakiaCET1h 0m
Europe/BrusselsBelgiumCET1h 0m
Europe/BudapestHungaryCET1h 0m
Europe/CopenhagenDenmarkCET1h 0m
Europe/GibraltarGibraltarCET1h 0m
Europe/LjubljanaSloveniaCET1h 0m
Arctic/LongyearbyenSvalbard and Jan MayenCET1h 0m
Europe/LuxembourgLuxembourgCET1h 0m
Europe/MadridSpainCET1h 0m
Europe/MonacoMonacoCET1h 0m
Europe/OsloNorwayCET1h 0m
Europe/ParisFranceCET1h 0m
Europe/PodgoricaMontenegroCET1h 0m
Europe/PragueCzechiaCET1h 0m
Europe/RomeItalyCET1h 0m
Europe/San_MarinoSan MarinoCET1h 0m
Europe/MaltaMaltaCET1h 0m
Europe/SarajevoBosnia and HerzegovinaCET1h 0m
Europe/SkopjeNorth MacedoniaCET1h 0m
Europe/StockholmSwedenCET1h 0m
Europe/TiraneAlbaniaCET1h 0m
Europe/VaduzLiechtensteinCET1h 0m
Europe/VaticanVaticanCET1h 0m
Europe/ViennaAustriaCET1h 0m
Europe/WarsawPolandCET1h 0m
Europe/ZagrebCroatiaCET1h 0m
Europe/ZurichSwitzerlandCET1h 0m
Europe/KaliningradRussiaEET2h 0m
Africa/TripoliLibyaEET2h 0m
Antarctica/TrollAntarcticaGMT0h 0m
Africa/JohannesburgSouth AfricaSAST2h 0m
Africa/MbabaneEswatiniSAST2h 0m
Africa/MaseruLesothoSAST2h 0m
Asia/KuwaitKuwaitAST3h 0m
Asia/BahrainBahrainAST3h 0m
Asia/BaghdadIraqAST3h 0m
Asia/QatarQatarAST3h 0m
Asia/RiyadhSaudi ArabiaAST3h 0m
Asia/AdenYemenAST3h 0m
Asia/AmmanJordanGMT+33h 0m
Asia/DamascusSyriaGMT+33h 0m
Africa/Addis_AbabaEthiopiaEAT3h 0m
Indian/AntananarivoMadagascarEAT3h 0m
Africa/AsmaraEritreaEAT3h 0m
Africa/Dar_es_SalaamTanzaniaEAT3h 0m
Africa/DjiboutiDjiboutiEAT3h 0m
Africa/KampalaUgandaEAT3h 0m
Indian/MayotteMayotteEAT3h 0m
Africa/MogadishuSomaliaEAT3h 0m
Indian/ComoroComorosEAT3h 0m
Africa/NairobiKenyaEAT3h 0m
Europe/AthensGreeceEET2h 0m
Asia/BeirutLebanonEET2h 0m
Europe/BucharestRomaniaEET2h 0m
Africa/CairoEgyptEET2h 0m
Europe/ChisinauMoldovaEET2h 0m
Asia/HebronPalestinian TerritoryEET2h 0m
Europe/HelsinkiFinlandEET2h 0m
Europe/KyivUkraineEET2h 0m
Europe/MariehamnAland IslandsEET2h 0m
Asia/NicosiaCyprusEET2h 0m
Europe/RigaLatviaEET2h 0m
Europe/SofiaBulgariaEET2h 0m
Europe/TallinnEstoniaEET2h 0m
Europe/VilniusLithuaniaEET2h 0m
Asia/JerusalemIsraelIST2h 0m
Europe/MinskBelarusMSK3h 0m
Europe/MoscowRussiaMSK3h 0m
Europe/SimferopolUkraineMSK3h 0m
Antarctica/SyowaAntarcticaSYOT3h 0m
Europe/IstanbulTurkeyTRT3h 0m
Asia/TehranIranIRST3h 30m
Asia/YerevanArmeniaAMT4h 0m
Asia/BakuAzerbaijanAZT4h 0m
Asia/TbilisiGeorgiaGET4h 0m
Asia/DubaiUnited Arab EmiratesGST4h 0m
Asia/MuscatOmanGST4h 0m
Indian/MauritiusMauritiusMUT4h 0m
Indian/ReunionReunionRET4h 0m
Europe/SamaraRussiaSAMT4h 0m
Indian/MaheSeychellesSCT4h 0m
Asia/KabulAfghanistanAFT4h 30m
Indian/KerguelenFrench Southern TerritoriesFSAT5h 0m
Indian/MaldivesMaldivesMVT5h 0m
Antarctica/MawsonAntarcticaMAWT5h 0m
Asia/KarachiPakistanPKT5h 0m
Asia/DushanbeTajikistanTJT5h 0m
Asia/AshgabatTurkmenistanTMT5h 0m
Asia/TashkentUzbekistanUZT5h 0m
Asia/AqtobeKazakhstanAQTT5h 0m
Asia/YekaterinburgRussiaYEKT5h 0m
Asia/ColomboSri LankaIST5h 30m
Asia/KolkataIndiaIST5h 30m
Asia/KathmanduNepalNPT5h 45m
Asia/DhakaBangladeshBST6h 0m
Asia/ThimphuBhutanBTT6h 0m
Asia/UrumqiChinaCST6h 0m
Asia/AlmatyKazakhstanALMT6h 0m
Indian/ChagosBritish Indian Ocean TerritoryIOT6h 0m
Asia/BishkekKyrgyzstanKGT6h 0m
Asia/OmskRussiaOMST6h 0m
Antarctica/VostokAntarcticaVOST6h 0m
Indian/CocosCocos IslandsCCT6h 30m
Asia/YangonMyanmarMMT6h 30m
Indian/ChristmasChristmas IslandCXT7h 0m
Antarctica/DavisAntarcticaDAVT7h 0m
Asia/HovdMongoliaHOVT7h 0m
Asia/BangkokThailandICT7h 0m
Asia/Ho_Chi_MinhVietnamICT7h 0m
Asia/Phnom_PenhCambodiaICT7h 0m
Asia/VientianeLaosICT7h 0m
Asia/NovosibirskRussiaNOVT7h 0m
Asia/JakartaIndonesiaWIB7h 0m
Australia/PerthAustraliaAWST8h 0m
Asia/BruneiBruneiBNT8h 0m
Asia/MakassarIndonesiaWITA8h 0m
Asia/MacauMacaoCST8h 0m
Asia/ShanghaiChinaCST8h 0m
Asia/Hong_KongHong KongHKT8h 0m
Asia/IrkutskRussiaIRKT8h 0m
Asia/Kuala_LumpurMalaysiaMYT8h 0m
Asia/ManilaPhilippinesPHT8h 0m
Asia/SingaporeSingaporeSGT8h 0m
Asia/TaipeiTaiwanTWT8h 0m
Asia/UlaanbaatarMongoliaULAT8h 0m
Australia/EuclaAustraliaACWST8h 45m
Asia/DiliTimor LesteTLT9h 0m
Asia/JayapuraIndonesiaWIT9h 0m
Asia/TokyoJapanJST9h 0m
Asia/PyongyangNorth KoreaKST9h 0m
Asia/SeoulSouth KoreaKST9h 0m
Pacific/PalauPalauPWT9h 0m
Asia/ChitaRussiaYAKT9h 0m
Australia/AdelaideAustraliaACST9h 30m
Australia/DarwinAustraliaACST9h 30m
Australia/BrisbaneAustraliaAEST10h 0m
Australia/SydneyAustraliaAEST10h 0m
Pacific/GuamGuamChST10h 0m
Pacific/SaipanNorthern Mariana IslandsChST10h 0m
Pacific/ChuukMicronesiaCHUT10h 0m
Antarctica/DumontDUrvilleAntarcticaDDUT10h 0m
Pacific/Port_MoresbyPapua New GuineaPGT10h 0m
Asia/VladivostokRussiaVLAT10h 0m
Australia/Lord_HoweAustraliaLHST10h 30m
Pacific/BougainvillePapua New GuineaBST11h 0m
Antarctica/CaseyAntarcticaCAST11h 0m
Pacific/KosraeMicronesiaKOST11h 0m
Pacific/NoumeaNew CaledoniaNCT11h 0m
Pacific/NorfolkNorfolk IslandNFT11h 0m
Asia/SakhalinRussiaSAKT11h 0m
Pacific/GuadalcanalSolomon IslandsSBT11h 0m
Pacific/EfateVanuatuVUT11h 0m
Pacific/FijiFijiFJT12h 0m
Pacific/TarawaKiribatiGILT12h 0m
Pacific/MajuroMarshall IslandsMHT12h 0m
Pacific/NauruNauruNRT12h 0m
Pacific/AucklandNew ZealandNZST12h 0m
Antarctica/McMurdoAntarcticaNZST12h 0m
Asia/KamchatkaRussiaPETT12h 0m
Pacific/FunafutiTuvaluTVT12h 0m
Pacific/WakeUnited States Minor Outlying IslandsWAKT12h 0m
Pacific/WallisWallis and FutunaWFT12h 0m
Pacific/ChathamNew ZealandCHAST12h 45m
Pacific/ApiaSamoaWST13h 0m
Pacific/KantonKiribatiPHOT13h 0m
Pacific/FakaofoTokelauTKT13h 0m
Pacific/TongatapuTongaTOT13h 0m
Pacific/KiritimatiKiribatiLINT14h 0m

Avoid the time zone confusion by using our free and visual time zone convertor here.

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