TZ History Every time zone change, ever made, explained

Countries and Territories (249)

All country names and two-letter codes are derived strictly from iso3166.tab in the IANA tzdb distribution. Select a country to view its assigned time zones and DST observance history.

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Afghanistan

Code: AF

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Åland Islands

Code: AX

Time Zones: 2

Total Transitions: 236

DST Status: observes dst

Albania

Code: AL

Time Zones: 1

Total Transitions: 133

DST Status: observes dst

Algeria

Code: DZ

Time Zones: 1

Total Transitions: 34

DST Status: abolished dst

Andorra

Code: AD

Time Zones: 1

Total Transitions: 108

DST Status: observes dst

Angola

Code: AO

Time Zones: 2

Total Transitions: 6

DST Status: never observed dst

Anguilla

Code: AI

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Antarctica

Code: AQ

Time Zones: 14

Total Transitions: 479

DST Status: observes dst

Antigua & Barbuda

Code: AG

Time Zones: 2

Total Transitions: 6

DST Status: abolished dst

Argentina

Code: AR

Time Zones: 12

Total Transitions: 733

DST Status: abolished dst

Armenia

Code: AM

Time Zones: 1

Total Transitions: 62

DST Status: abolished dst

Aruba

Code: AW

Time Zones: 2

Total Transitions: 6

DST Status: abolished dst

Australia

Code: AU

Time Zones: 13

Total Transitions: 1079

DST Status: observes dst

Austria

Code: AT

Time Zones: 1

Total Transitions: 139

DST Status: observes dst

Azerbaijan

Code: AZ

Time Zones: 1

Total Transitions: 66

DST Status: abolished dst

Bahamas

Code: BS

Time Zones: 2

Total Transitions: 387

DST Status: observes dst

Bahrain

Code: BH

Time Zones: 2

Total Transitions: 5

DST Status: never observed dst

Bangladesh

Code: BD

Time Zones: 1

Total Transitions: 7

DST Status: abolished dst

Barbados

Code: BB

Time Zones: 1

Total Transitions: 15

DST Status: abolished dst

Belarus

Code: BY

Time Zones: 1

Total Transitions: 68

DST Status: abolished dst

Belgium

Code: BE

Time Zones: 1

Total Transitions: 185

DST Status: observes dst

Belize

Code: BZ

Time Zones: 1

Total Transitions: 98

DST Status: abolished dst

Benin

Code: BJ

Time Zones: 2

Total Transitions: 6

DST Status: never observed dst

Bermuda

Code: BM

Time Zones: 1

Total Transitions: 156

DST Status: observes dst

Bhutan

Code: BT

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Bolivia

Code: BO

Time Zones: 1

Total Transitions: 3

DST Status: abolished dst

Botswana

Code: BW

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Bouvet Island

Code: BV

Time Zones: 0

Total Transitions: 0

DST Status: never observed dst

Brazil

Code: BR

Time Zones: 16

Total Transitions: 757

DST Status: abolished dst

Britain (UK)

Code: GB

Time Zones: 1

Total Transitions: 242

DST Status: observes dst

Brunei

Code: BN

Time Zones: 2

Total Transitions: 20

DST Status: abolished dst

Bulgaria

Code: BG

Time Zones: 1

Total Transitions: 126

DST Status: observes dst

Burkina Faso

Code: BF

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Burundi

Code: BI

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Cambodia

Code: KH

Time Zones: 2

Total Transitions: 7

DST Status: never observed dst

Cameroon

Code: CM

Time Zones: 2

Total Transitions: 5

DST Status: never observed dst

Canada

Code: CA

Time Zones: 26

Total Transitions: 2878

DST Status: observes dst

Cape Verde

Code: CV

Time Zones: 1

Total Transitions: 4

DST Status: abolished dst

Caribbean NL

Code: BQ

Time Zones: 2

Total Transitions: 8

DST Status: abolished dst

Cayman Islands

Code: KY

Time Zones: 2

Total Transitions: 4

DST Status: never observed dst

Chad

Code: TD

Time Zones: 1

Total Transitions: 3

DST Status: abolished dst

Chile

Code: CL

Time Zones: 4

Total Transitions: 548

DST Status: observes dst

China

Code: CN

Time Zones: 2

Total Transitions: 30

DST Status: abolished dst

Christmas Island

Code: CX

Time Zones: 2

Total Transitions: 3

DST Status: never observed dst

Colombia

Code: CO

Time Zones: 1

Total Transitions: 4

DST Status: abolished dst

Comoros

Code: KM

Time Zones: 2

Total Transitions: 6

DST Status: never observed dst

Congo (Dem. Rep.)

Code: CD

Time Zones: 4

Total Transitions: 8

DST Status: never observed dst

Congo (Rep.)

Code: CG

Time Zones: 2

Total Transitions: 5

DST Status: never observed dst

Cook Islands

Code: CK

Time Zones: 1

Total Transitions: 28

DST Status: abolished dst

Costa Rica

Code: CR

Time Zones: 1

Total Transitions: 10

DST Status: abolished dst

Côte d’Ivoire

Code: CI

Time Zones: 1

Total Transitions: 1

DST Status: never observed dst

Croatia

Code: HR

Time Zones: 2

Total Transitions: 238

DST Status: observes dst

Cuba

Code: CU

Time Zones: 1

Total Transitions: 156

DST Status: observes dst

Curaçao

Code: CW

Time Zones: 2

Total Transitions: 6

DST Status: abolished dst

Cyprus

Code: CY

Time Zones: 2

Total Transitions: 253

DST Status: observes dst

Czech Republic

Code: CZ

Time Zones: 1

Total Transitions: 144

DST Status: observes dst

Denmark

Code: DK

Time Zones: 2

Total Transitions: 277

DST Status: observes dst

Djibouti

Code: DJ

Time Zones: 2

Total Transitions: 6

DST Status: never observed dst

Dominica

Code: DM

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Dominican Republic

Code: DO

Time Zones: 1

Total Transitions: 17

DST Status: abolished dst

East Timor

Code: TL

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Ecuador

Code: EC

Time Zones: 2

Total Transitions: 8

DST Status: abolished dst

Egypt

Code: EG

Time Zones: 1

Total Transitions: 157

DST Status: observes dst

El Salvador

Code: SV

Time Zones: 1

Total Transitions: 5

DST Status: abolished dst

Equatorial Guinea

Code: GQ

Time Zones: 2

Total Transitions: 6

DST Status: never observed dst

Eritrea

Code: ER

Time Zones: 2

Total Transitions: 8

DST Status: never observed dst

Estonia

Code: EE

Time Zones: 1

Total Transitions: 123

DST Status: observes dst

Ethiopia

Code: ET

Time Zones: 2

Total Transitions: 7

DST Status: never observed dst

Falkland Islands

Code: FK

Time Zones: 1

Total Transitions: 70

DST Status: abolished dst

Faroe Islands

Code: FO

Time Zones: 1

Total Transitions: 115

DST Status: observes dst

Fiji

Code: FJ

Time Zones: 1

Total Transitions: 29

DST Status: abolished dst

Finland

Code: FI

Time Zones: 1

Total Transitions: 118

DST Status: observes dst

France

Code: FR

Time Zones: 1

Total Transitions: 184

DST Status: observes dst

French Guiana

Code: GF

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

French Polynesia

Code: PF

Time Zones: 3

Total Transitions: 3

DST Status: never observed dst

French S. Terr.

Code: TF

Time Zones: 3

Total Transitions: 4

DST Status: never observed dst

Gabon

Code: GA

Time Zones: 2

Total Transitions: 5

DST Status: never observed dst

Gambia

Code: GM

Time Zones: 2

Total Transitions: 4

DST Status: never observed dst

Georgia

Code: GE

Time Zones: 1

Total Transitions: 51

DST Status: abolished dst

Germany

Code: DE

Time Zones: 3

Total Transitions: 383

DST Status: observes dst

Ghana

Code: GH

Time Zones: 2

Total Transitions: 62

DST Status: abolished dst

Gibraltar

Code: GI

Time Zones: 1

Total Transitions: 198

DST Status: observes dst

Greece

Code: GR

Time Zones: 1

Total Transitions: 138

DST Status: observes dst

Greenland

Code: GL

Time Zones: 4

Total Transitions: 362

DST Status: observes dst

Grenada

Code: GD

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Guadeloupe

Code: GP

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Guam

Code: GU

Time Zones: 1

Total Transitions: 21

DST Status: abolished dst

Guatemala

Code: GT

Time Zones: 1

Total Transitions: 9

DST Status: abolished dst

Guernsey

Code: GG

Time Zones: 2

Total Transitions: 483

DST Status: observes dst

Guinea

Code: GN

Time Zones: 2

Total Transitions: 4

DST Status: never observed dst

Guinea-Bissau

Code: GW

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Guyana

Code: GY

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Haiti

Code: HT

Time Zones: 1

Total Transitions: 86

DST Status: observes dst

Honduras

Code: HN

Time Zones: 1

Total Transitions: 7

DST Status: abolished dst

Hong Kong

Code: HK

Time Zones: 1

Total Transitions: 69

DST Status: abolished dst

Hungary

Code: HU

Time Zones: 1

Total Transitions: 151

DST Status: observes dst

Iceland

Code: IS

Time Zones: 2

Total Transitions: 69

DST Status: abolished dst

India

Code: IN

Time Zones: 1

Total Transitions: 7

DST Status: abolished dst

Indonesia

Code: ID

Time Zones: 4

Total Transitions: 23

DST Status: never observed dst

Iran

Code: IR

Time Zones: 1

Total Transitions: 71

DST Status: abolished dst

Iraq

Code: IQ

Time Zones: 1

Total Transitions: 54

DST Status: abolished dst

Ireland

Code: IE

Time Zones: 1

Total Transitions: 228

DST Status: observes dst

Isle of Man

Code: IM

Time Zones: 2

Total Transitions: 484

DST Status: observes dst

Israel

Code: IL

Time Zones: 1

Total Transitions: 149

DST Status: observes dst

Italy

Code: IT

Time Zones: 1

Total Transitions: 170

DST Status: observes dst

Jamaica

Code: JM

Time Zones: 1

Total Transitions: 22

DST Status: abolished dst

Japan

Code: JP

Time Zones: 1

Total Transitions: 9

DST Status: abolished dst

Jersey

Code: JE

Time Zones: 2

Total Transitions: 483

DST Status: observes dst

Jordan

Code: JO

Time Zones: 1

Total Transitions: 87

DST Status: abolished dst

Kazakhstan

Code: KZ

Time Zones: 7

Total Transitions: 358

DST Status: abolished dst

Kenya

Code: KE

Time Zones: 1

Total Transitions: 5

DST Status: never observed dst

Kiribati

Code: KI

Time Zones: 3

Total Transitions: 7

DST Status: never observed dst

Korea (North)

Code: KP

Time Zones: 1

Total Transitions: 5

DST Status: never observed dst

Korea (South)

Code: KR

Time Zones: 1

Total Transitions: 29

DST Status: abolished dst

Kuwait

Code: KW

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Kyrgyzstan

Code: KG

Time Zones: 1

Total Transitions: 52

DST Status: abolished dst

Laos

Code: LA

Time Zones: 2

Total Transitions: 9

DST Status: never observed dst

Latvia

Code: LV

Time Zones: 1

Total Transitions: 126

DST Status: observes dst

Lebanon

Code: LB

Time Zones: 1

Total Transitions: 141

DST Status: observes dst

Lesotho

Code: LS

Time Zones: 2

Total Transitions: 9

DST Status: abolished dst

Liberia

Code: LR

Time Zones: 1

Total Transitions: 3

DST Status: never observed dst

Libya

Code: LY

Time Zones: 1

Total Transitions: 32

DST Status: abolished dst

Liechtenstein

Code: LI

Time Zones: 2

Total Transitions: 239

DST Status: observes dst

Lithuania

Code: LT

Time Zones: 1

Total Transitions: 120

DST Status: observes dst

Luxembourg

Code: LU

Time Zones: 2

Total Transitions: 368

DST Status: observes dst

Macau

Code: MO

Time Zones: 1

Total Transitions: 71

DST Status: abolished dst

Madagascar

Code: MG

Time Zones: 2

Total Transitions: 8

DST Status: abolished dst

Malawi

Code: MW

Time Zones: 2

Total Transitions: 4

DST Status: never observed dst

Malaysia

Code: MY

Time Zones: 3

Total Transitions: 34

DST Status: abolished dst

Maldives

Code: MV

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Mali

Code: ML

Time Zones: 2

Total Transitions: 4

DST Status: never observed dst

Malta

Code: MT

Time Zones: 1

Total Transitions: 169

DST Status: observes dst

Marshall Islands

Code: MH

Time Zones: 3

Total Transitions: 14

DST Status: never observed dst

Martinique

Code: MQ

Time Zones: 1

Total Transitions: 4

DST Status: abolished dst

Mauritania

Code: MR

Time Zones: 2

Total Transitions: 4

DST Status: never observed dst

Mauritius

Code: MU

Time Zones: 1

Total Transitions: 5

DST Status: abolished dst

Mayotte

Code: YT

Time Zones: 2

Total Transitions: 6

DST Status: never observed dst

Mexico

Code: MX

Time Zones: 12

Total Transitions: 880

DST Status: observes dst

Micronesia

Code: FM

Time Zones: 5

Total Transitions: 25

DST Status: never observed dst

Moldova

Code: MD

Time Zones: 1

Total Transitions: 141

DST Status: observes dst

Monaco

Code: MC

Time Zones: 2

Total Transitions: 369

DST Status: observes dst

Mongolia

Code: MN

Time Zones: 2

Total Transitions: 100

DST Status: abolished dst

Montenegro

Code: ME

Time Zones: 2

Total Transitions: 238

DST Status: observes dst

Montserrat

Code: MS

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Morocco

Code: MA

Time Zones: 1

Total Transitions: 72

DST Status: observes dst

Mozambique

Code: MZ

Time Zones: 1

Total Transitions: 1

DST Status: never observed dst

Myanmar (Burma)

Code: MM

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Namibia

Code: NA

Time Zones: 1

Total Transitions: 53

DST Status: abolished dst

Nauru

Code: NR

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Nepal

Code: NP

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Netherlands

Code: NL

Time Zones: 2

Total Transitions: 365

DST Status: observes dst

New Caledonia

Code: NC

Time Zones: 1

Total Transitions: 7

DST Status: abolished dst

New Zealand

Code: NZ

Time Zones: 2

Total Transitions: 285

DST Status: observes dst

Nicaragua

Code: NI

Time Zones: 1

Total Transitions: 16

DST Status: abolished dst

Niger

Code: NE

Time Zones: 2

Total Transitions: 7

DST Status: never observed dst

Nigeria

Code: NG

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Niue

Code: NU

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Norfolk Island

Code: NF

Time Zones: 1

Total Transitions: 42

DST Status: observes dst

North Macedonia

Code: MK

Time Zones: 2

Total Transitions: 238

DST Status: observes dst

Norway

Code: NO

Time Zones: 2

Total Transitions: 284

DST Status: observes dst

Oman

Code: OM

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Pakistan

Code: PK

Time Zones: 1

Total Transitions: 11

DST Status: abolished dst

Palau

Code: PW

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Palestine

Code: PS

Time Zones: 2

Total Transitions: 306

DST Status: observes dst

Panama

Code: PA

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Papua New Guinea

Code: PG

Time Zones: 2

Total Transitions: 7

DST Status: never observed dst

Paraguay

Code: PY

Time Zones: 1

Total Transitions: 104

DST Status: abolished dst

Peru

Code: PE

Time Zones: 1

Total Transitions: 16

DST Status: abolished dst

Philippines

Code: PH

Time Zones: 1

Total Transitions: 14

DST Status: abolished dst

Pitcairn

Code: PN

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Poland

Code: PL

Time Zones: 1

Total Transitions: 165

DST Status: observes dst

Portugal

Code: PT

Time Zones: 3

Total Transitions: 655

DST Status: observes dst

Puerto Rico

Code: PR

Time Zones: 1

Total Transitions: 4

DST Status: abolished dst

Qatar

Code: QA

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Réunion

Code: RE

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Romania

Code: RO

Time Zones: 1

Total Transitions: 136

DST Status: observes dst

Russia

Code: RU

Time Zones: 27

Total Transitions: 1800

DST Status: abolished dst

Rwanda

Code: RW

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Samoa (American)

Code: AS

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Samoa (western)

Code: WS

Time Zones: 1

Total Transitions: 26

DST Status: abolished dst

San Marino

Code: SM

Time Zones: 2

Total Transitions: 340

DST Status: observes dst

Sao Tome & Principe

Code: ST

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Saudi Arabia

Code: SA

Time Zones: 1

Total Transitions: 1

DST Status: never observed dst

Senegal

Code: SN

Time Zones: 2

Total Transitions: 3

DST Status: never observed dst

Serbia

Code: RS

Time Zones: 1

Total Transitions: 119

DST Status: observes dst

Seychelles

Code: SC

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Sierra Leone

Code: SL

Time Zones: 2

Total Transitions: 20

DST Status: abolished dst

Singapore

Code: SG

Time Zones: 1

Total Transitions: 8

DST Status: abolished dst

Slovakia

Code: SK

Time Zones: 2

Total Transitions: 288

DST Status: observes dst

Slovenia

Code: SI

Time Zones: 2

Total Transitions: 238

DST Status: observes dst

Solomon Islands

Code: SB

Time Zones: 1

Total Transitions: 1

DST Status: never observed dst

Somalia

Code: SO

Time Zones: 2

Total Transitions: 8

DST Status: never observed dst

South Africa

Code: ZA

Time Zones: 1

Total Transitions: 6

DST Status: abolished dst

South Sudan

Code: SS

Time Zones: 1

Total Transitions: 35

DST Status: abolished dst

Spain

Code: ES

Time Zones: 3

Total Transitions: 406

DST Status: observes dst

Sri Lanka

Code: LK

Time Zones: 1

Total Transitions: 8

DST Status: abolished dst

St Barthelemy

Code: BL

Time Zones: 2

Total Transitions: 8

DST Status: abolished dst

St Helena

Code: SH

Time Zones: 2

Total Transitions: 3

DST Status: never observed dst

St Kitts & Nevis

Code: KN

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

St Lucia

Code: LC

Time Zones: 2

Total Transitions: 6

DST Status: abolished dst

St Maarten (Dutch)

Code: SX

Time Zones: 2

Total Transitions: 8

DST Status: abolished dst

St Martin (French)

Code: MF

Time Zones: 2

Total Transitions: 8

DST Status: abolished dst

St Vincent

Code: VC

Time Zones: 2

Total Transitions: 6

DST Status: abolished dst

Sudan

Code: SD

Time Zones: 1

Total Transitions: 35

DST Status: abolished dst

Suriname

Code: SR

Time Zones: 1

Total Transitions: 4

DST Status: never observed dst

Sweden

Code: SE

Time Zones: 2

Total Transitions: 263

DST Status: observes dst

Switzerland

Code: CH

Time Zones: 1

Total Transitions: 120

DST Status: observes dst

Syria

Code: SY

Time Zones: 1

Total Transitions: 121

DST Status: abolished dst

Taiwan

Code: TW

Time Zones: 1

Total Transitions: 41

DST Status: abolished dst

Tajikistan

Code: TJ

Time Zones: 1

Total Transitions: 24

DST Status: abolished dst

Tanzania

Code: TZ

Time Zones: 2

Total Transitions: 8

DST Status: never observed dst

Thailand

Code: TH

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Togo

Code: TG

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Tokelau

Code: TK

Time Zones: 1

Total Transitions: 2

DST Status: never observed dst

Tonga

Code: TO

Time Zones: 1

Total Transitions: 10

DST Status: abolished dst

Trinidad & Tobago

Code: TT

Time Zones: 2

Total Transitions: 5

DST Status: abolished dst

Tunisia

Code: TN

Time Zones: 1

Total Transitions: 34

DST Status: abolished dst

Turkey

Code: TR

Time Zones: 1

Total Transitions: 115

DST Status: abolished dst

Turkmenistan

Code: TM

Time Zones: 1

Total Transitions: 25

DST Status: abolished dst

Turks & Caicos Is

Code: TC

Time Zones: 1

Total Transitions: 115

DST Status: observes dst

Tuvalu

Code: TV

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Uganda

Code: UG

Time Zones: 2

Total Transitions: 9

DST Status: never observed dst

Ukraine

Code: UA

Time Zones: 2

Total Transitions: 196

DST Status: observes dst

United States

Code: US

Time Zones: 29

Total Transitions: 3852

DST Status: observes dst

Uruguay

Code: UY

Time Zones: 1

Total Transitions: 86

DST Status: abolished dst

Uzbekistan

Code: UZ

Time Zones: 2

Total Transitions: 48

DST Status: abolished dst

Vanuatu

Code: VU

Time Zones: 1

Total Transitions: 23

DST Status: abolished dst

Vatican City

Code: VA

Time Zones: 2

Total Transitions: 340

DST Status: observes dst

Venezuela

Code: VE

Time Zones: 1

Total Transitions: 5

DST Status: never observed dst

Vietnam

Code: VN

Time Zones: 2

Total Transitions: 11

DST Status: never observed dst

Wallis & Futuna

Code: WF

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Western Sahara

Code: EH

Time Zones: 1

Total Transitions: 61

DST Status: observes dst

Yemen

Code: YE

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Zambia

Code: ZM

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst

Zimbabwe

Code: ZW

Time Zones: 2

Total Transitions: 2

DST Status: never observed dst