The world is divided in how many time zones?

Answer 1

Currently 41 different time zones are used during at least part of every year in the officially inhabited parts of Earth. However, there are never more than 39 in use at any given time, because UTC-3.5 and UTC-2.5 are never in use at the same time, and the same is true of UTC+12.75 and UTC+13.75.

Listed below are the 41 time zones from east to west with the countries or territories where they are used:

UTC + 14 hours

• part of Kiribati
• Samoa (September-April only)

UTC + 13.75 hours

• Chatham Islands of New Zealand (September-April only)

UTC + 13 hours

• part of Antarctica (September-April only)
• Fiji (October-January only)
• part of Kiribati
• New Zealand (September-April only except Tokelau)
• Samoa (April-September only)
• Tonga

UTC + 12.75 hours

• Chatham Islands of New Zealand (April-September only)

UTC + 12 hours

• part of Antarctica (April-September only)
• Fiji (January-October only)
• part of Kiribati
• Marshall Islands
• Nauru
• New Zealand (April-September only)
• part of Russia
• Tuvalu
• Wallis and Futuna (France)

UTC + 11 hours

• part of Antarctica
• part of Australia (October-April only)
• part of Micronesia
• New Caledonia (France)
• Norfolk Island (Australia)
• part of Papua New Guinea
  
• part of Russia
• Solomon Islands
• Vanuatu

UTC + 10.5 hours

• parts of Australia

UTC + 10 hours

• part of Antarctica
• part of Australia
• Guam (USA)
• part of Micronesia
• Northern Mariana Islands (USA)
• most of Papua New Guinea
• part of Russia

UTC + 9.5 hours

• part of Australia

UTC + 9 hours

• part of Indonesia
• Japan
• part of Mongolia (March-September only)
  
• Palau
• part of Russia
• South Korea
• Timor-Leste

UTC + 8.75 hours

• part of Australia

UTC + 8.5 hours

• North Korea

UTC + 8 hours

• part of Antarctica
• part of Australia
• Brunei
• China
• part of Indonesia
• Malaysia
• parts of Mongolia
• Philippines
• part of Russia
• Singapore
• Taiwan

UTC + 7 hours

• part of Antarctica
• Cambodia
• Christmas Island (Australia)
• part of Indonesia
• Laos
• part of Mongolia (September-March only)
  
• part of Russia
• Thailand
• Vietnam

UTC + 6.5 hours

• Cocos Islands (Australia)
• Myanmar

UTC + 6 hours

• part of Antarctica
• Bangladesh
• Bhutan
• British Indian Ocean Territory (UK)
• part of Kazakhstan
• Kyrgyzstan
• part of Russia

UTC + 5.75 hours

• Nepal

UTC + 5.5 hours

• India
• Sri Lanka

UTC + 5 hours

• part of Antarctica
• Azerbaijan (March-October only)
• French Southern & Antarctic Lands
• part of Kazakhstan
• Maldives
• Pakistan
• part of Russia
  
• Tajikistan
• Turkmenistan
• Uzbekistan

UTC + 4.5 hours

• Afghanistan
• Iran (March-September only)

UTC + 4 hours

• Armenia
• Azerbaijan (October-March only)
• Georgia
• Mauritius
• Oman
• Réunion (France)
• part of Russia
• Seychelles
• United Arab Emirates

UTC + 3.5 hours

• Iran (September-March only)

UTC + 3 hours

• Akrotiri & Dhekelia (UK) (March-October only)
• part of Antarctica
• Bahrain
• Belarus
• Bulgaria (March-October only)
• Comoros
• Cyprus (March-October only)
• Djibouti
• Eritrea
• Estonia (March-October only)
• Ethiopia
• Finland (March-October only)
• Greece (March-October only)
• Iraq
• Israel (March-October only)
• Jordan (March-October only)
• Kenya
• Kuwait
• Latvia (March-October only)
• Lebanon (March-October only)
• Lithuania (March-October only)
• Madagascar
• Mayotte (France)
• Moldova (March-October only)
• Palestinian Territories (March-September only)
• Qatar
• Romania (March-October only)
• part of Russia
• Saudi Arabia
• Somalia
• South Sudan
• Sudan
• Syria (March-October only)
• Tanzania
• Turkey (March-November only)
• Uganda
• part of Ukraine
• Yemen

UTC + 2 hours

• Akrotiri & Dhekelia (UK) (October-March only)
• Albania (March-October only)
• Andorra (March-October only)
• Austria (March-October only)
• Belgium (March-October only)
• Bosnia & Herzegovina (March-October only)
• Botswana
• Bulgaria (October-March only)
• Burundi
• part of D.R. Congo
• Croatia (March-October only)
• Cyprus (October-March only)
• Czech Republic (March-October only)
• Denmark (March-October only)
• Egypt
• Estonia (October-March only)
• Finland (October-March only)
• France (March-October only)
• Germany (March-October only)
• Gibraltar (UK) (March-October only)
• Greece (October-March only)
• Hungary (March-October only)
• Israel (October-March only)
• Italy (March-October only)
• Jordan (October-March only)
• Kosovo (March-October only)
• Latvia (October-March only)
• Lebanon (October-March only)
• Lesotho
• Libya
• Liechtenstein (March-October only)
• Lithuania (October-March only)
• Luxembourg (March-October only)
• Macedonia (March-October only)
• Malawi
• Malta (March-October only)
• Moldova (October-March only)
• Monaco (March-October only)
• Montenegro (March-October only)
• Mozambique
• Namibia (September-April only)
• Netherlands (March-October only)
• Norway (March-October only)
• Palestinian Territories (September-March only)
• Poland (March-October only)
• Romania (October-March only)
• part of Russia
  
• Rwanda
• San Marino (March-October only)
• Serbia (March-October only)
• Slovakia (March-October only)
• Slovenia (March-October only)
• South Africa
• Spain (March-October only)
• Svalbard (Norway) (March-October only)
• Swaziland
• Sweden (March-October only)
• Switzerland (March-October only)
• Syria (October-March only)
• Turkey (November-March only)
• part of Ukraine (October-March only)
• Vatican City (March-October only)
• Zambia
• Zimbabwe

UTC + 1 hour

• Albania (October-March only)
• Algeria
• Andorra (October-March only)
• Angola
• Austria (October-March only)
• Belgium (October-March only)
• Benin
• Bosnia & Herzegovina (October-March only)
• Cameroon
• Canary Islands (Spain) (March-October only)
• Central African Republic
• Chad
• Congo
• part of D.R. Congo
• Croatia (October-March only)
• Czech Republic (October-March only)
• Denmark (October-March only)
• Equatorial Guinea
• Faroe Islands (Denmark) (March-October only)
• France (October-March only)
• Gabon
• Germany (October-March only)
• Gibraltar (UK) (October-March only)
• Hungary (October-March only)
• Ireland (March-October only)
• Italy (October-March only)
• Kosovo (October-March only)
• Liechtenstein (October-March only)
• Luxembourg (October-March only)
• Macedonia (October-March only)
• Madeira Islands (Portugal) (March-October only)
• Malta (October-March only)
• Monaco (October-March only)
• Montenegro (October-March only)
• Morocco (March-October only except Ramadan)
• Namibia (April-September only)
• Netherlands (October-March only)
• Niger
• Nigeria
• Norway (October-March only)
• Poland (October-March only)
• Portugal (March-October only)
• San Marino (October-March only)
• Serbia (October-March only)
• Slovakia (October-March only)
• Slovenia (October-March only)
• Spain (October-March only)
• Svalbard (Norway) (October-March only)
• Sweden (October-March only)
• Switzerland (October-March only)
• Tunisia
• United Kingdom (March-October only)
• Vatican City (October-March only)
• Western Sahara (March-October only except Ramadan)

UTC

• Azores (Portugal) (March-October only)
• Burkina Faso
• Canary Islands (Spain) (October-March only)
• Côte d'Ivoire
• Faroe Islands (Denmark) (October-March only)
• Gambia
• Ghana
• part of Greenland (Denmark)
• Guinea
• Guinea-Bissau
• Iceland
• Ireland (October-March only)
• Liberia
• Madeira Islands (Portugal) (October-March only)
• Mali
• Mauritania
• Morocco (October-March & Ramadan only)
• Portugal (October-March only)
• Saint Helena, Ascension & Tristan da Cunha Islands (UK)
• São Tomé and Príncipe
• Senegal
• Sierra Leone
• Togo
• United Kingdom (October-March only)
• Western Sahara (October-March & Ramadan only)

UTC - 1 hour

• Azores (Portugal) (October-March only)
• Cape Verde
• part of Greenland (Denmark) (October-March only)

UTC - 2 hours

• part of Brazil
• part of Greenland (Denmark) (March-October only)
• Saint-Pierre & Miquelon Islands (France) (March-November only)
• South Georgia & the South Sandwich Islands (UK)
• Uruguay (October-March only)

UTC - 2.5 hours

• part of Canada (March-November only)

UTC - 3 hours

• part of Antarctica
• Argentina
• Bermuda (UK) (March-November only)
• part of Brazil
• part of Canada (March-November only)
• Chile
• Falkland Islands (UK)
• French Guiana
• part of Greenland (Denmark)
• Paraguay (October-March only)
• Saint-Pierre & Miquelon Islands (France) (November-March only)
• Suriname
• Uruguay

UTC - 3.5 hours

• part of Canada (November-March only)

UTC - 4 hours

• Anguilla (UK)part of Antarctica (April-September only)
• Antigua & Barbuda
• Bahamas (March-November only)
• Barbados
• Bermuda (UK) (November-March only)
• Bolivia
• part of Brazil
• British Virgin Islands
• part of Canada
• Chile (April-September only)
• Cuba (March-November only)
• Dominica
• Dominican Republic
• part of Greenland (Denmark) (November-March only)
• Grenada
• Guadeloupe (France)
• Guyana
• Haiti (March-November only)
• Martinica (France)
• Montserrat (UK)
• Netherlands Antilles
• Paraguay (March-October only)
• Puerto Rico (USA)
• Saint Kitts & Nevis
• Saint Lucia
• Saint Vincent & the Grenadines
• Trinidad & Tobago
• Turks & Caicos Islands (UK)
• part of the United States (March-November only)
• United States Virgin Islands

UTC - 4.5 hours

• Venezuela

UTC - 5 hours

• Bahamas (November-March only)
• part of Brazil
• part of Canada
• Cayman Islands (UK)
• Colombia
• Cuba (November-March only)
• Easter Island (Chile)
• Ecuador
• Haiti (November-March only)
• Jamaica
• parts of Mexico
• Panama
• Peru
• part of the United States

UTC - 6 hours

• Belize
• part of Canada
• Costa Rica
• Easter Island (Chile) (April-September only)
• El Salvador
• Galapagos Islands (Ecuador)
• Guatemala
• Honduras
• part of Mexico
• Nicaragua
• part of the United States

UTC - 7 hours

• part of Canada
• part of Mexico
• part of the United States

UTC - 8 hours

• part of Canada (November-March only)
• part of Mexico (November-March only)
• Pitcairn Islands (UK)
• part of the United States

UTC - 9 hours

• part of French Polynesia
• part of the United States

UTC - 9.5 hours

• part of French Polynesia

UTC - 10 hours

• Cook Islands
• part of French Polynesia
• part of the United States

UTC - 11 hours

• American Samoa (USA)
• Midway Islands (USA)
• Niue (New Zealand)

Answer 2

Currently, 40 different times are recognized during the southern hemisphere's Summer Time, and 38 when the northern hemisphere is in Summer Time (a.k.a. Daylight Saving Time).

Answer 3

24