This is a list of countries, regions, and territories grouped by '''time zone'''.
Although many time zones have descriptive names used by people in them, they are least ambiguously identified by their relationship to '''UTC''' (Universal Time, Co-ordinated). UTC used to be called '''GMT''' (Greenwich Mean Time), after the Royal Observatory located in the Greenwich area of London.
UTC is also sometimes called '''Z''' or '''Zulu''' time. A time may be written as e.g. 21:45Z with the Z indicating UTC. The "Z" is for "zero", and "Zulu" is the two-way radio pronunciation of "Z". It comes from the nautical system in which each time zone was assigned a letter.
Time zones east of UTC and west of the International Date Line are specified by the number of hours ''ahead'' of UTC (e.g. UTC+4); zones west of UTC and east of the Date Line are specified by the number of hours ''behind'' UTC (e.g. UTC-6). Crossing the Date Line going eastward, clocks are turned back a full 24 hours, and vice versa in the opposite direction. (Note: The total span of time zones covers more than 24 hours because the Date Line jogs westward and eastward to keep certain national island groupings on the same calendar day, although they are not within a single time zone.)
UTC+14
Kiribati Line Islands (''except U.S. dependencies - see UTC-11'')
UTC+13:45
New Zealand: Chatham Islands (''during Daylight Saving Time'')
UTC+13
Kiribati: Phoenix Islands
New Zealand (''during Daylight Saving Time'')
South Pole (''during Daylight Saving Time'')
Tonga
UTC+12:45
New Zealand: Chatham Islands
UTC+12
Fiji
Kiribati: Gilbert Islands
Marshall Islands
Nauru
New Zealand
Russia: Chukotka, Kamchatka
South Pole
Tuvalu
Wake Island
Wallis and Futuna
UTC+11:30
Australia: Norfolk Island
UTC+11
Australia: Australian Capital Territory, New South Wales, Tasmania, Victoria (''during Daylight Saving Time'')
Federated States of Micronesia: Kosrae, Pohnpei
New Caledonia
Russia: Kuril Islands, Magadan Oblast, Sakha
Solomon Islands
Vanuatu
UTC+10:30
Australia: South Australia (''during Daylight Saving Time'')
UTC+10
Australia ("Australian Eastern Time"): Australian Capital Territory, New South Wales, Queensland, Tasmania, Victoria
Federated States of Micronesia: Chuuk, Yap
Guam
Northern Mariana Islands
Papua New Guinea
Russia: Primorsky Krai, Khabarovsk Krai, Yakutia, Sakhalin Island
UTC+9:30
Australia ("Australian Central Time"): Northern Territory, South Australia
UTC+9
Australia Western Australia (''during Daylight Saving Time'')
East Timor
Indonesia (eastern): Maluku, Western New Guinea
Japan
North Korea
South Korea
Palau
Russia: Amur Oblast, Chita Oblast, Yakutia
UTC+8
Australia ("Australian Western Time"): Western Australia
Brunei
China (including Hong Kong and Macau)
Indonesia (central): (Bali, Borneo)
Malaysia
Mongolia (most of country)
Philippines
Singapore
Taiwan
Russia: Buryatia, Irkutsk Oblast
UTC+7
Cambodia
Christmas Island (Australia)
Indonesia (western): (Java, Sumatra)
Laos
Mongolia (Hovd, Uvs, and Bayan-Olgii)
Russia: Kemerovo, Khakassia, Krasnoyarsk Krai, Tomsk, Tuva
Thailand
Vietnam
UTC+6:30
Cocos Islands
Myanmar
UTC+6
Bangladesh
Bhutan
British Indian Ocean Territory (CIA)
Kazakhstan (Eastern)
Kyrgyzstan
Russia: Altai Krai, Altai Republic, Novosibirsk Oblast, Omsk Oblast, Tomsk Oblast
UTC+5:45
Nepal
UTC+5:30
India
Sri Lanka
UTC+5
British Indian Ocean Territory (NAO)
French Southern and Antarctic Lands
Heard Island and McDonald Islands
Kazakhstan (Western)
Maldives
Pakistan
Russia: Astrakhan, Bashkortostan, Chelyabinsk, Kurgan, Orenburg, Perm, Saratov, Sverdlovsk, Tyumen, Ulyanovsk, Volgograd
Tajikistan
Turkmenistan
Uzbekistan
UTC+4:30
Afghanistan
UTC+4
Armenia
Azerbaijan
Georgia
Mauritius
Oman
Reunion
Russia: Samara, Udmurtia
Seychelles
United Arab Emirates
UTC+3:30
Iran
UTC+3
Bahrain
Comoros
Djibouti
Eritrea
Ethiopia
Iraq
Kenya
Kuwait
Madagascar
Mayotte
Qatar
Russia: most of European portion, including Moscow, Saint Petersburg, Rostov on Don, Novaya Zemlya, Franz Josef Land, and all railroads throughout Russia
Saudi Arabia
Somalia
Sudan
Tanzania
Uganda
Yemen
UTC+2
Belarus
Botswana
Bulgaria
Burundi
Democratic Republic of the Congo (eastern)
Cyprus
Egypt
Estonia
Finland
Greece
Israel
Jordan
Latvia
Lebanon
Lesotho
Libya
Lithuania
Malawi
Moldova
Mozambique
Romania
Russia: Kaliningrad Oblast
Rwanda
South Africa
Swaziland
Syria
Turkey
Ukraine
Zambia
Zimbabwe
UTC+1
Albania
Andorra
Algeria
Angola
Austria
Belgium
Benin
Bosnia and Herzegovina
Cameroon
Central African Republic
Chad
Republic of the Congo
Democratic Republic of the Congo (western)
Croatia
Czech Republic
Denmark
Equatorial Guinea
France
Gabon
Germany
Gibraltar
Hungary
Italy
Liechtenstein
Luxembourg
Republic of Macedonia
Malta
Monaco
Montenegro
Namibia
Netherlands
Niger
Nigeria
Norway
Poland
San Marino
Serbia
Slovakia
Slovenia
Spain
Sweden
Switzerland
Tunisia*
Vatican City
UTC
Burkina Faso
Bouvet Island
Canary Islands
Cote d'Ivoire
Faroe Islands
Gambia
Ghana
Greenland (northeastern)
Guernsey
Guinea
Guinea-Bissau
Iceland
Ireland
Isle of Man
Jersey
Liberia
Mali
Mauritania
Morocco
Northern Ireland
Portugal
Saint Helena
Senegal
Sierra Leone
Sao Tome and Principe
Togo
United Kingdom
Western Sahara
UTC-1
Azores (Portugal)
Cape Verde
Greenland (east)
UTC-2
Fernando de Noronha (Brazil)
South Georgia and the South Sandwich Islands
Trindade and Martim Vaz (uninhabited islands) (Brazil)
UTC-3
Argentina
Brazil: Brasilia, Rio, Sao Paulo, Fortaleza, Maceio, Recife, Salvador etc.
French Guiana
Greenland (central)
Guyana
Saint Pierre and Miquelon
Suriname
Uruguay
UTC-3:30
Canada ("Newfoundland Time"): Newfoundland and Labrador
UTC-4
Anguilla
Antigua and Barbuda
Aruba
Barbados
Bermuda
Bolivia
Brazil: Boa Vista, Campo Grande, Manaus
Canada ("Atlantic Time"): Labrador, New Brunswick, Nova Scotia, Prince Edward Island, eastern Quebec
Chile
Dominica
Dominican Republic
Falkland Islands
Greenland (west)
Grenada
Guadeloupe
Guyana
Martinique
Montserrat
Netherlands Antilles
Paraguay
Puerto Rico
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Trinidad and Tobago
Virgin Islands
UTC-4:30
Venezuela
UTC-5
Bahamas
Brazil: Acre
Canada ("Eastern Time"): Nunavut, most of Ontario, most of Quebec
Cayman Islands
Colombia
Cuba
Ecuador
Haiti
Jamaica
Navassa Island
Panama
Peru
Turks and Caicos Islands
United States of America ("Eastern Time"): Maine, New Hampshire, Vermont, New York, Massachusetts, Connecticut, Rhode Island, Michigan,except extreme northwestern counties Indiana except the southwest corner, Ohio, Pennsylvania, New Jersey, eastern Kentucky, West Virginia, Virginia, Washington, D.C., Maryland, Delaware, eastern Tennessee, North Carolina, Georgia, South Carolina, Florida except western part of panhandle.
UTC-6
Belize
Canada ("Central Time"): Manitoba, Saskatchewan, north-western Ontario
Costa Rica
Easter Island
El Salvador
Galapagos Islands
Guatemala
Honduras
Mexico
Nicaragua
United States of America ("Central Time"): Wisconsin, Illinois, the southwest corner of Indiana, western Kentucky, western and middle Tennessee, Mississippi, Alabama, Minnesota, Iowa, Missouri, Arkansas, Louisiana, north and east North Dakota, eastern South Dakota, middle and eastern Nebraska, most of Kansas, Oklahoma, most of Texas, part of western Florida(panhandle).
UTC-7
Canada ("Mountain Time"): Alberta, small eastern portion of British Columbia
Mexico: Baja California Sur: Chihuahua, Nayarit, Sinaloa, Sonora
United States of America ("Mountain Time"): southwest North Dakota, western South Dakota, western Nebraska, a sliver of Kansas, Montana, a sliver of Oregon, southern Idaho, Wyoming, Utah, Colorado, Arizona, New Mexico, a corner of Texas
UTC-8
Canada ("Pacific Time"): most of British Columbia, Yukon
Clipperton Island
Mexico: Baja California Norte
Pitcairn Islands
United States of America ("Pacific Time"): Washington, northern Idaho, most of Oregon, California, Nevada
UTC-9
French Polynesia: Gambier Islands
United States of America: most of Alaska
UTC-9:30
French Polynesia: Marquesa Islands
UTC-10
Cook Islands
French Polynesia: Society Islands, Tuamotu Islands, Austral Islands
Johnston Atoll
Tokelau
United States of America: Hawaii, and Aleutian Islands in Alaska
UTC-11
American Samoa
Jarvis Island, Kingman Reef, Palmyra Atoll
Midway Islands
Niue
Samoa
UTC-12
Baker Island
Howland Island