Time Zone Abbreviations
Common time zone abbreviations, their UTC offsets and where they are used.
| Abbr. | Name | UTC | Used in |
|---|---|---|---|
| HST | Hawaii Standard Time | −10 | Hawaii |
| AKST | Alaska Standard Time | −9 | Alaska (winter) |
| AKDT | Alaska Daylight Time | −8 | Alaska (summer) |
| PST | Pacific Standard Time | −8 | US & Canada west coast (winter) |
| PDT | Pacific Daylight Time | −7 | US & Canada west coast (summer) |
| MST | Mountain Standard Time | −7 | Denver (winter), Arizona all year |
| MDT | Mountain Daylight Time | −6 | Denver, Calgary (summer) |
| CST | Central Standard Time | −6 | Chicago, Texas, Mexico City (winter) |
| CDT | Central Daylight Time | −5 | Chicago, Texas (summer) |
| EST | Eastern Standard Time | −5 | New York, Toronto, Florida (winter) |
| EDT | Eastern Daylight Time | −4 | New York, Toronto (summer) |
| AST | Atlantic Standard Time | −4 | Puerto Rico; Halifax (winter) |
| ADT | Atlantic Daylight Time | −3 | Halifax (summer) |
| NST | Newfoundland Standard Time | −3:30 | Newfoundland (winter) |
| BRT | Brasília Time | −3 | São Paulo, Rio de Janeiro |
| ART | Argentina Time | −3 | Buenos Aires |
| UTC | Coordinated Universal Time | ±0 | World reference time; "Z" / Zulu |
| GMT | Greenwich Mean Time | ±0 | UK & Ireland (winter), Iceland, Ghana |
| WET | Western European Time | ±0 | Portugal, Canary Islands (winter) |
| BST | British Summer Time | +1 | UK (summer) |
| IST | Irish Standard Time | +1 | Ireland (summer) |
| WEST | Western European Summer Time | +1 | Portugal (summer) |
| CET | Central European Time | +1 | Germany, France, Italy, Spain (winter) |
| WAT | West Africa Time | +1 | Nigeria, Angola |
| CEST | Central European Summer Time | +2 | Germany, France, Italy, Spain (summer) |
| EET | Eastern European Time | +2 | Greece, Finland, Ukraine, Egypt (winter) |
| CAT | Central Africa Time | +2 | Zambia, Zimbabwe, Mozambique |
| SAST | South Africa Standard Time | +2 | South Africa |
| EEST | Eastern European Summer Time | +3 | Greece, Finland, Ukraine (summer) |
| MSK | Moscow Time | +3 | Moscow |
| TRT | Turkey Time | +3 | Türkiye |
| EAT | East Africa Time | +3 | Kenya, Ethiopia, Tanzania |
| GST | Gulf Standard Time | +4 | UAE, Oman |
| PKT | Pakistan Standard Time | +5 | Pakistan |
| IST | India Standard Time | +5:30 | India, Sri Lanka |
| NPT | Nepal Time | +5:45 | Nepal |
| ICT | Indochina Time | +7 | Thailand, Vietnam, Cambodia |
| WIB | Western Indonesia Time | +7 | Jakarta |
| CST | China Standard Time | +8 | China |
| HKT | Hong Kong Time | +8 | Hong Kong |
| SGT | Singapore Time | +8 | Singapore |
| PHT | Philippine Time | +8 | Philippines |
| AWST | Australian Western Standard Time | +8 | Perth |
| JST | Japan Standard Time | +9 | Japan |
| KST | Korea Standard Time | +9 | South Korea |
| ACST | Australian Central Standard Time | +9:30 | Darwin; Adelaide (winter) |
| AEST | Australian Eastern Standard Time | +10 | Brisbane; Sydney, Melbourne (winter) |
| ACDT | Australian Central Daylight Time | +10:30 | Adelaide (summer) |
| AEDT | Australian Eastern Daylight Time | +11 | Sydney, Melbourne (summer) |
| NZST | New Zealand Standard Time | +12 | New Zealand (winter) |
| NZDT | New Zealand Daylight Time | +13 | New Zealand (summer) |
Same letters, different zones
- CST: US Central (UTC−6) or China (UTC+8).
- IST: India (UTC+5:30), Ireland in summer (UTC+1) or Israel (UTC+2).
- BST: British Summer Time (UTC+1) or Bangladesh (UTC+6).
- AST: Atlantic (UTC−4) or Arabia (UTC+3).
That is why the time zone converter uses names like America/Chicago instead.