Time Zone Abbreviations
Global Time Zone Reference
- Complete reference guide to worldwide Time Zone Abbreviations, IANA Identifiers, and UTC Offsets
- Use the lightweight filters above the complete list to scan by region, status, DST status, or keyword.
- Click on an Abbreviation to dive even deeper!
- Click on an Offset to change the time to compare with!
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- Representative IANA time zone (one per row): many abbreviations cover multiple countries, so exact clock-change dates and times vary by location. The table uses one IANA time zone for its transition details; for a full per-zone schedule, use Upcoming DST.
Table Rows: 259 | Unique Abbreviations: 228 | IANA Zones Represented: 439
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Friday, September 11, 2026
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Time Zone Abbreviations
Fast alphabetical list with lightweight filters.
Columns259 results
MultipleSame abbreviation has more than one valid meaning.
CurrentCurrently used from IANA/tzdb data.
HistoricalNo longer currently observed under that name.
ReferenceUseful lookup label included for completeness.
UmbrellaGeneral label covering standard and daylight time.
MilitaryLettered military/NATO time zone.
259 of 259 abbreviations
| Abbreviation | Time zone name | Location | Offset | Status | DST | Next clock change |
|---|---|---|---|---|---|---|
| A | Alfa Time Zone | Military | UTC+1 | Military | No DST | — |
| ACDT | Australian Central Daylight Time | Australia | UTC+10:30 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| ACST | Australian Central Standard Time | Australia | UTC+9:30 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| ACST | Australian Central Standard Time | Australia | UTC+9:30 | Current | No DST | — |
| ACTMultiple | Acre Time | South America | UTC-5 | Current | No DST | — |
| ACTMultiple | Australian Central Time | Australia | UTC+9:30 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| ACWST | Australian Central Western Standard Time | Australia | UTC+8:45 | Current | No DST | — |
| ADTMultiple | Arabia Daylight Time | Asia | UTC+3 | Historical | No DST | — |
| ADTMultiple | Atlantic Daylight Time | North America, Atlantic | UTC-3 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| AEDT | Australian Eastern Daylight Time | Australia | UTC+11 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| AEST | Australian Eastern Standard Time | Australia | UTC+10 | Current | No DST | — |
| AEST | Australian Eastern Standard Time | Australia | UTC+10 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| AET | Australian Eastern Time | Australia | UTC+10 | Umbrella | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| AFT | Afghanistan Time | Asia | UTC+4:30 | Current | No DST | — |
| AKDT | Alaska Daylight Time | North America | UTC-8 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| AKST | Alaska Standard Time | North America | UTC-9 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| ALMT | Alma-Ata Time | Asia | UTC+5 | Current | No DST | — |
| AMSTMultiple | Amazon Summer Time | South America | UTC-4 | Historical | No DST | — |
| AMSTMultiple | Armenia Summer Time | Asia | UTC+4 | Historical | No DST | — |
| AMTMultiple | Amazon Time | South America | UTC-4 | Current | No DST | — |
| AMTMultiple | Armenia Time | Asia | UTC+4 | Current | No DST | — |
| ANAST | Anadyr Summer Time | Asia | UTC+12 | Historical | No DST | — |
| ANAT | Anadyr Time | Asia | UTC+12 | Current | No DST | — |
| AoE | Anywhere on Earth | Pacific | UTC-12 | Reference | No DST | — |
| AQTT | AQTT | Asia | UTC+5 | Current | No DST | — |
| ART | Argentina Time | South America, Antarctica | UTC-3 | Current | No DST | — |
| ASTMultiple | Arabia Standard Time | Asia | UTC+3 | Current | No DST | — |
| ASTMultiple | Atlantic Standard Time | North America, Atlantic, Caribbean | UTC-4 | Current | No DST | — |
| ASTMultiple | Atlantic Standard Time | North America, Atlantic, Caribbean | UTC-4 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| ASTMultiple | Atlantic Standard Time | Atlantic | UTC-4 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| AT | Atlantic Time | North America, Caribbean, Atlantic | UTC-3 | Umbrella | Standard Time | Back 1h · 2:00 am → 1:00 am |
| AWDT | Australian Western Daylight Time | Australia | UTC+8 | Historical | No DST | — |
| AWST | Australian Western Standard Time | Australia | UTC+8 | Current | No DST | — |
| AZOST | Azores Summer Time | Atlantic | UTC+0 | Current | DST Active | Back 1h · 1:00 am → 12:00 am |
| AZOT | Azores Standard Time | Atlantic | UTC-1 | Current | Standard Time | Back 1h · 1:00 am → 12:00 am |
| AZST | Azerbaijan Summer Time | Asia | UTC+4 | Historical | No DST | — |
| AZT | Azerbaijan Time | Asia | UTC+4 | Current | No DST | — |
| B | Bravo Time Zone | Military | UTC+2 | Military | No DST | — |
| BNT | BNT | Asia | UTC+8 | Current | No DST | — |
| BOT | Bolivia Time | South America | UTC-4 | Current | No DST | — |
| BRST | Brasilia Summer Time | South America | UTC-3 | Historical | No DST | — |
| BRT | Brasília Time | South America | UTC-3 | Current | No DST | — |
| BSTMultiple | Bangladesh Standard Time | Asia | UTC+6 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| BSTMultiple | Bougainville Standard Time | Pacific | UTC+11 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| BSTMultiple | British Summer Time | Europe | UTC+1 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| BTT | Bhutan Time | Asia | UTC+6 | Current | No DST | — |
| C | Charlie Time Zone | Military | UTC+3 | Military | No DST | — |
| CAST | Casey Time | Antarctica | UTC+8 | Reference | No DST | — |
| CAT | Central Africa Time | Africa | UTC+2 | Current | No DST | — |
| CCT | Cocos Islands Time | Indian Ocean | UTC+6:30 | Current | No DST | — |
| CDTMultiple | Central Daylight Time | North America | UTC-5 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| CDTMultiple | Cuba Daylight Time | Caribbean | UTC-4 | Current | DST Active | Back 1h · 1:00 am → 12:00 am |
| CEST | Central European Summer Time | Europe, Antarctica, Africa | UTC+2 | Current | DST Active | Back 1h · 3:00 am → 2:00 am |
| CET | Central European Time | Africa | UTC+1 | Current | No DST | — |
| CET | Central European Time | Africa, Europe | UTC+1 | Current | Standard Time | Back 1h · 3:00 am → 2:00 am |
| CHADT | Chatham Daylight Time | Pacific | UTC+13:45 | Current | Standard Time | Forward 1h · 2:45 am → 3:45 am |
| CHAST | Chatham Standard Time | Pacific | UTC+12:45 | Current | Standard Time | Forward 1h · 2:45 am → 3:45 am |
| CHOST | Choibalsan Summer Time | Asia | UTC+8 | Historical | No DST | — |
| CHST | Chamorro Standard Time | Pacific | UTC+10 | Current | No DST | — |
| CHUT | Chuuk Time | Pacific | UTC+10 | Current | No DST | — |
| CIDST | Cayman Islands Daylight Saving Time | Caribbean | UTC-5 | Historical | No DST | — |
| CIST | Cayman Islands Standard Time | Caribbean | UTC-5 | Historical | No DST | — |
| CKT | Cook Island Time | Pacific | UTC-10 | Current | No DST | — |
| CLST | Chile Summer Time | South America | UTC-3 | Current | DST Active | Back 1h · 12:00 am → 11:00 pm |
| CLT | Chile Standard Time | South America, Antarctica | UTC-3 | Current | Standard Time | Back 1h · 12:00 am → 11:00 pm |
| CLT | Chile Standard Time | South America | UTC-4 | Current | Standard Time | Back 1h · 12:00 am → 11:00 pm |
| COT | Colombia Time | South America | UTC-5 | Current | No DST | — |
| CSTMultiple | Central Standard Time | North America, Central America | UTC-6 | Current | No DST | — |
| CSTMultiple | Central Standard Time | North America | UTC-6 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| CSTMultiple | China Standard Time | Asia | UTC+8 | Current | No DST | — |
| CSTMultiple | Cuba Standard Time | Caribbean | UTC-5 | Current | Standard Time | Back 1h · 1:00 am → 12:00 am |
| CT | Central Time | North America, Central America | UTC-5 | Umbrella | Standard Time | Back 1h · 2:00 am → 1:00 am |
| CVT | Cape Verde Time | Atlantic | UTC-1 | Current | No DST | — |
| CXT | Christmas Island Time | Australia | UTC+7 | Current | No DST | — |
| D | Delta Time Zone | Military | UTC+4 | Military | No DST | — |
| DAVT | Davis Time | Antarctica | UTC+7 | Reference | No DST | — |
| DDUT | Dumont-d'Urville Time | Antarctica | UTC+10 | Reference | No DST | — |
| E | Echo Time Zone | Military | UTC+5 | Military | No DST | — |
| EASST | Easter Island Summer Time | Pacific | UTC-5 | Current | DST Active | Back 1h · 10:00 pm → 9:00 pm |
| EAST | Easter Island Standard Time | Pacific | UTC-6 | Current | Standard Time | Back 1h · 10:00 pm → 9:00 pm |
| EAT | East Africa Time | Africa, Indian Ocean | UTC+3 | Current | No DST | — |
| ECT | Ecuador Time | South America | UTC-5 | Current | No DST | — |
| EDT | Eastern Daylight Time | North America, Caribbean | UTC-4 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| EEST | Eastern European Summer Time | Africa, Asia, Europe | UTC+3 | Current | DST Active | Back 1h · 4:00 am → 3:00 am |
| EET | Eastern European Time | Africa, Asia, Europe | UTC+2 | Current | Standard Time | Back 1h · 4:00 am → 3:00 am |
| EET | Eastern European Time | Africa, Asia, Europe | UTC+2 | Current | Standard Time | Back 1h · 4:00 am → 3:00 am |
| EGST | Eastern Greenland Summer Time | North America | UTC-1 | Current | DST Active | Back 1h · 12:00 am → 11:00 pm |
| EGT | Eastern Greenland Time | North America | UTC-2 | Current | Standard Time | Back 1h · 12:00 am → 11:00 pm |
| EST | Eastern Standard Time | North America, Caribbean, Central America | UTC-5 | Current | No DST | — |
| EST | Eastern Standard Time | North America, Caribbean | UTC-5 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| ET | Eastern Time | Caribbean, Central America, North America | UTC-4 | Umbrella | Standard Time | Back 1h · 2:00 am → 1:00 am |
| F | Foxtrot Time Zone | Military | UTC+6 | Military | No DST | — |
| FJT | Fiji Time | Pacific | UTC+12 | Current | No DST | — |
| FKST | Falkland Islands Summer Time | South America | UTC-3 | Current | No DST | — |
| FKT | Falkland Island Time | South America | UTC-3 | Historical | No DST | — |
| FNT | Fernando de Noronha Time | South America | UTC-2 | Current | No DST | — |
| G | Golf Time Zone | Military | UTC+7 | Military | No DST | — |
| GALT | Galápagos Time | Pacific | UTC-6 | Current | No DST | — |
| GAMT | Gambier Time | Pacific | UTC-9 | Current | No DST | — |
| GET | Georgia Standard Time | Asia, Europe | UTC+4 | Current | No DST | — |
| GFT | French Guiana Time | South America | UTC-3 | Current | No DST | — |
| GILT | Gilbert Island Time | Pacific | UTC+12 | Current | No DST | — |
| GMT | Greenwich Mean Time | Europe, Africa, North America, Antarctica, Atlantic | UTC+0 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| GMT | Greenwich Mean Time | Europe, Africa, North America, Antarctica, Atlantic | UTC+0 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| GSTMultiple | Gulf Standard Time | Asia | UTC+4 | Current | No DST | — |
| GSTMultiple | South Georgia Time | South America | UTC-2 | Current | No DST | — |
| GYT | Guyana Time | South America | UTC-4 | Current | No DST | — |
| H | Hotel Time Zone | Military | UTC+8 | Military | No DST | — |
| HDT | HDT | North America | UTC-9 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| HKT | Hong Kong Time | Asia | UTC+8 | Current | No DST | — |
| HST | Hawaii-Aleutian Standard Time | North America, Pacific | UTC-10 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| HST | Hawaii-Aleutian Standard Time | North America, Pacific | UTC-10 | Current | No DST | — |
| I | India Time Zone | Military | UTC+9 | Military | No DST | — |
| ICT | Indochina Time | Asia | UTC+7 | Current | No DST | — |
| IDT | Israel Daylight Time | Asia | UTC+3 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| IOT | Indian Ocean Time | Indian Ocean | UTC+6 | Current | No DST | — |
| IRKT | Irkutsk Time | Asia | UTC+8 | Current | No DST | — |
| IRST | Iran Standard Time | Asia | UTC+3:30 | Current | No DST | — |
| ISTMultiple | India Standard Time | Asia | UTC+5:30 | Current | No DST | — |
| ISTMultiple | Irish Standard Time | Europe | UTC+1 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| ISTMultiple | Israel Standard Time | Asia | UTC+2 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| JST | Japan Standard Time | Asia | UTC+9 | Current | No DST | — |
| K | Kilo Time Zone | Military | UTC+11 | Military | No DST | — |
| KGT | Kyrgyzstan Time | Asia | UTC+6 | Current | No DST | — |
| KOST | Kosrae Time | Pacific | UTC+11 | Current | No DST | — |
| KRAST | Krasnoyarsk Summer Time | Asia | UTC+7 | Historical | No DST | — |
| KRAT | Krasnoyarsk Time | Asia | UTC+7 | Current | No DST | — |
| KST | Korea Standard Time | Asia | UTC+9 | Current | No DST | — |
| KUYT | Kuybyshev Time | Europe | UTC+4 | Historical | No DST | — |
| L | Lima Time Zone | Military | UTC+12 | Military | No DST | — |
| LHDT | Lord Howe Daylight Time | Australia | UTC+11 | Current | Standard Time | Forward 30m · 2:00 am → 2:30 am |
| LHST | Lord Howe Standard Time | Australia | UTC+10:30 | Current | Standard Time | Forward 30m · 2:00 am → 2:30 am |
| LINT | Line Islands Time | Pacific | UTC+14 | Current | No DST | — |
| M | Mike Time Zone | Military | UTC+12 | Military | No DST | — |
| MAGST | Magadan Summer Time | Asia | UTC+11 | Historical | No DST | — |
| MAGT | Magadan Time | Asia | UTC+11 | Current | No DST | — |
| MART | Marquesas Time | Pacific | UTC-9:30 | Current | No DST | — |
| MDT | Mountain Daylight Time | North America | UTC-6 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| MHT | Marshall Islands Time | Pacific | UTC+12 | Current | No DST | — |
| MMT | Myanmar Time | Asia | UTC+6:30 | Current | No DST | — |
| MSD | Moscow Daylight Time | Europe | UTC+3 | Historical | No DST | — |
| MSK | Moscow Standard Time | Europe | UTC+3 | Current | No DST | — |
| MSTMultiple | Malaysia Time | Asia | UTC+8 | Current | No DST | — |
| MSTMultiple | Mountain Standard Time | North America | UTC-7 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| MSTMultiple | Mountain Standard Time | North America | UTC-7 | Current | No DST | — |
| MT | Mountain Time | North America | UTC-6 | Umbrella | Standard Time | Back 1h · 2:00 am → 1:00 am |
| MUT | Mauritius Time | Africa | UTC+4 | Current | No DST | — |
| MVT | Maldives Time | Asia | UTC+5 | Current | No DST | — |
| MYT | Malaysia Time | Asia | UTC+8 | Reference | No DST | — |
| N | November Time Zone | Military | UTC-1 | Military | No DST | — |
| NCT | New Caledonia Time | Pacific | UTC+11 | Current | No DST | — |
| NDT | Newfoundland Daylight Time | North America | UTC-2:30 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| NFDT | Norfolk Daylight Time | Australia | UTC+11 | Historical | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| NFST | Norfolk Island Summer Time | Pacific | UTC+12 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| NFT | Norfolk Island Time | Pacific | UTC+11 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| NOVST | Novosibirsk Summer Time | Asia | UTC+7 | Historical | No DST | — |
| NOVT | Novosibirsk Time | Asia | UTC+7 | Current | No DST | — |
| NPT | Nepal Time | Asia | UTC+5:45 | Current | No DST | — |
| NRT | Nauru Time | Pacific | UTC+12 | Current | No DST | — |
| NST | Newfoundland Standard Time | North America | UTC-3:30 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| NUT | Niue Time | Pacific | UTC-11 | Current | No DST | — |
| NZDT | New Zealand Daylight Time | Antarctica, Pacific | UTC+13 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| NZST | New Zealand Standard Time | Antarctica, Pacific | UTC+12 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| O | Oscar Time Zone | Military | UTC-2 | Military | No DST | — |
| OMSST | Omsk Summer Time | Asia | UTC+6 | Historical | No DST | — |
| OMST | Omsk Time | Asia | UTC+6 | Current | No DST | — |
| ORAT | Oral Time | Asia | UTC+5 | Reference | No DST | — |
| P | Papa Time Zone | Military | UTC-3 | Military | No DST | — |
| PDT | Pacific Daylight Time | North America | UTC-7 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| PET | Peru Time | South America | UTC-5 | Current | No DST | — |
| PETST | Kamchatka Summer Time | Asia | UTC+12 | Historical | No DST | — |
| PETT | Kamchatka Time | Asia | UTC+12 | Current | No DST | — |
| PGT | Papua New Guinea Time | Pacific | UTC+10 | Current | No DST | — |
| PHOT | Phoenix Island Time | Pacific | UTC+13 | Current | No DST | — |
| PHT | Philippine Time | Asia | UTC+8 | Reference | No DST | — |
| PKT | Pakistan Standard Time | Asia | UTC+5 | Current | No DST | — |
| PMDT | Saint Pierre and Miquelon Daylight Time | North America | UTC-2 | Current | DST Active | Back 1h · 2:00 am → 1:00 am |
| PMST | Saint Pierre and Miquelon Standard Time | North America | UTC-3 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| PONT | Pohnpei Time | Pacific | UTC+11 | Current | No DST | — |
| PSTMultiple | Pacific Standard Time | North America | UTC-8 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| PSTMultiple | Philippine Standard Time | Asia | UTC+8 | Current | No DST | — |
| PSTMultiple | Pitcairn Time | Pacific | UTC-8 | Current | No DST | — |
| PT | Pacific Time | North America, Pacific | UTC-7 | Umbrella | Standard Time | Back 1h · 2:00 am → 1:00 am |
| PWT | Palau Time | Pacific | UTC+9 | Current | No DST | — |
| PYST | Paraguay Summer Time | South America | UTC-3 | Historical | No DST | — |
| PYTMultiple | Paraguay Time | South America | UTC-3 | Current | No DST | — |
| PYTMultiple | Pyongyang Time | Asia | UTC+9 | Historical | No DST | — |
| Q | Quebec Time Zone | Military | UTC-4 | Military | No DST | — |
| QYZT | Qyzylorda Time | Asia | UTC+5 | Reference | No DST | — |
| R | Romeo Time Zone | Military | UTC-5 | Military | No DST | — |
| RET | Réunion Time | Africa | UTC+4 | Current | No DST | — |
| S | Sierra Time Zone | Military | UTC-6 | Military | No DST | — |
| SAKT | Sakhalin Time | Asia | UTC+11 | Current | No DST | — |
| SAMT | Samara Time | Europe | UTC+4 | Current | No DST | — |
| SAST | South Africa Standard Time | Africa | UTC+2 | Current | No DST | — |
| SBT | Solomon Islands Time | Pacific | UTC+11 | Current | No DST | — |
| SCT | Seychelles Time | Africa | UTC+4 | Current | No DST | — |
| SGT | Singapore Time | Asia | UTC+8 | Current | No DST | — |
| SRET | Srednekolymsk Time | Asia | UTC+11 | Reference | No DST | — |
| SRT | Suriname Time | South America | UTC-3 | Current | No DST | — |
| SST | Samoa Standard Time | Pacific | UTC-11 | Current | No DST | — |
| SYOT | Syowa Time | Antarctica | UTC+3 | Reference | No DST | — |
| T | Tango Time Zone | Military | UTC-7 | Military | No DST | — |
| TAHT | Tahiti Time | Pacific | UTC-10 | Current | No DST | — |
| TFT | French Southern and Antarctic Time | Indian Ocean | UTC+5 | Current | No DST | — |
| TJT | Tajikistan Time | Asia | UTC+5 | Current | No DST | — |
| TKT | Tokelau Time | Pacific | UTC+13 | Current | No DST | — |
| TLT | East Timor Time | Asia | UTC+9 | Current | No DST | — |
| TMT | Turkmenistan Time | Asia | UTC+5 | Current | No DST | — |
| TOST | Tonga Summer Time | Pacific | UTC+13 | Historical | No DST | — |
| TOT | Tonga Time | Pacific | UTC+13 | Current | No DST | — |
| TRT | Turkey Time | Asia, Europe | UTC+3 | Current | No DST | — |
| TVT | Tuvalu Time | Pacific | UTC+12 | Current | No DST | — |
| U | Uniform Time Zone | Military | UTC-8 | Military | No DST | — |
| ULAST | Ulaanbaatar Summer Time | Asia | UTC+8 | Historical | No DST | — |
| ULAT | Ulaanbaatar Time | Asia | UTC+7 | Current | No DST | — |
| UTC | Coordinated Universal Time | Worldwide | UTC+0 | Reference | No DST | — |
| UTC+02 | UTC+02 | Antarctica | UTC+2 | Current | Standard Time | Back 2h · 3:00 am → 1:00 am |
| UTC+03 | UTC+03 | Antarctica | UTC+3 | Current | No DST | — |
| UTC+05 | UTC+05 | Antarctica | UTC+5 | Current | No DST | — |
| UTC+06 | UTC+06 | Antarctica | UTC+5 | Current | No DST | — |
| UTC+07 | UTC+07 | Antarctica | UTC+7 | Current | No DST | — |
| UTC+10 | UTC+10 | Antarctica | UTC+10 | Current | No DST | — |
| UTC+11 | UTC+11 | Antarctica | UTC+8 | Current | No DST | — |
| UTC+11 | UTC+11 | Antarctica | UTC+10 | Current | Standard Time | Forward 1h · 2:00 am → 3:00 am |
| UYST | Uruguay Summer Time | South America | UTC-3 | Historical | No DST | — |
| UYT | Uruguay Time | South America | UTC-3 | Current | No DST | — |
| UZT | Uzbekistan Time | Asia | UTC+5 | Current | No DST | — |
| V | Victor Time Zone | Military | UTC-9 | Military | No DST | — |
| VET | Venezuela Time | South America | UTC-4 | Current | No DST | — |
| VLAST | Vladivostok Summer Time | Asia | UTC+10 | Historical | No DST | — |
| VLAT | Vladivostok Time | Asia | UTC+10 | Current | No DST | — |
| VOST | Vostok Time | Antarctica | UTC+5 | Reference | No DST | — |
| VUT | Vanuatu Time | Pacific | UTC+11 | Current | No DST | — |
| W | Whiskey Time Zone | Military | UTC-10 | Military | No DST | — |
| WAKT | Wake Island Time | Pacific | UTC+12 | Current | No DST | — |
| WARST | Western Argentine Summer Time | South America | UTC-3 | Historical | No DST | — |
| WAST | West Africa Summer Time | Africa | UTC+2 | Historical | No DST | — |
| WAT | West Africa Time | Africa | UTC+1 | Current | No DST | — |
| WEST | Western European Summer Time | Africa, Atlantic, Europe | UTC+1 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| WET | Western European Time | Africa, Atlantic, Europe | UTC+1 | Current | Standard Time | Back 1h · 2:00 am → 1:00 am |
| WFT | Wallis and Futuna Time | Pacific | UTC+12 | Current | No DST | — |
| WGST | Western Greenland Summer Time | North America | UTC-1 | Current | DST Active | Back 1h · 12:00 am → 11:00 pm |
| WGT | Western Greenland Time | North America | UTC-2 | Current | Standard Time | Back 1h · 12:00 am → 11:00 pm |
| WIB | Western Indonesia Time | Asia | UTC+7 | Current | No DST | — |
| WIT | Eastern Indonesia Time | Asia | UTC+9 | Current | No DST | — |
| WITA | Central Indonesia Time | Asia | UTC+8 | Current | No DST | — |
| WSTMultiple | Western Sahara Summer Time | Africa | UTC+1 | Historical | Standard Time | Back 1h · 2:00 am → 1:00 am |
| WSTMultiple | Western Samoa Time | Pacific | UTC+13 | Current | No DST | — |
| WT | Western Sahara Standard Time | Africa | UTC+1 | Historical | Standard Time | Back 1h · 2:00 am → 1:00 am |
| X | X-ray Time Zone | Military | UTC-11 | Military | No DST | — |
| XJT | Xinjiang Time | Asia | UTC+6 | Current | No DST | — |
| Y | Yankee Time Zone | Military | UTC-12 | Military | No DST | — |
| YAKST | Yakutsk Summer Time | Asia | UTC+9 | Historical | No DST | — |
| YAKT | Yakutsk Time | Asia | UTC+9 | Current | No DST | — |
| YAPT | Yap Time | Pacific | UTC+10 | Historical | No DST | — |
| YEKST | Yekaterinburg Summer Time | Asia | UTC+5 | Historical | No DST | — |
| YEKT | Yekaterinburg Time | Asia | UTC+5 | Current | No DST | — |
| Z | Zulu Time Zone | Military | UTC+0 | Military | No DST | — |