TZ History Every time zone change, ever made, explained

Daylight Saving Time (DST) History

In tzdb terms, daylight saving is modeled through Rule blocks defining transition instants, wall-clock offsets (typically +1:00), and designation letter modifications (e.g. EST to EDT).

First civil DST introduction: 1916 in the German Empire and United Kingdom during World War I

Countries with recorded DST history: 164 nations

Countries with multiple adoption/abolition cycles: 127 nations

Advertisement Space

Nations Observing DST by Year (1916 to Present)

0 48 95 1916 1940 1960 1980 2000 2026

Text summary: DST usage surged during World War I (1916 to 1918), World War II (1942 to 1945), and the 1970s energy crises, before plateauing and gradually declining in recent decades.

Countries that Abolished and Later Re-adopted DST

Many countries experimented with daylight saving, repealed it, and reinstated it decades later:

Antigua & Barbuda (AG)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Anguilla (AI)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Albania (AL)

First Adoption: Year 1940

Abolition Year(s): 1940, 1943

Re-adoption Year(s): 1943, 1974

Current Status: observes dst

Armenia (AM)

First Adoption: Year 1981

Abolition Year(s): 1995, 2011

Re-adoption Year(s): 1997

Current Status: abolished dst

Antarctica (AQ)

First Adoption: Year 1927

Abolition Year(s): 1940, 1968

Re-adoption Year(s): 1965, 1974

Current Status: observes dst

Argentina (AR)

First Adoption: Year 1930

Abolition Year(s): 1941, 1943, 1946, 1968, 1974, 1992, 1999, 2008

Re-adoption Year(s): 1943, 1946, 1963, 1974, 1988, 1999, 2007

Current Status: abolished dst

Austria (AT)

First Adoption: Year 1916

Abolition Year(s): 1918, 1920, 1940, 1948

Re-adoption Year(s): 1920, 1940, 1943, 1980

Current Status: observes dst

Australia (AU)

First Adoption: Year 1916

Abolition Year(s): 1918, 1943, 1951

Re-adoption Year(s): 1941, 1948, 1967

Current Status: observes dst

Aruba (AW)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Åland Islands (AX)

First Adoption: Year 1942

Abolition Year(s): 1942

Re-adoption Year(s): 1981

Current Status: observes dst

Azerbaijan (AZ)

First Adoption: Year 1981

Abolition Year(s): 1992, 2015

Re-adoption Year(s): 1996

Current Status: abolished dst

Bosnia & Herzegovina (BA)

First Adoption: Year 1941

Abolition Year(s): 1941, 1945

Re-adoption Year(s): 1943, 1983

Current Status: observes dst

Barbados (BB)

First Adoption: Year 1942

Abolition Year(s): 1944, 1980

Re-adoption Year(s): 1977

Current Status: abolished dst

Belgium (BE)

First Adoption: Year 1916

Abolition Year(s): 1940, 1946

Re-adoption Year(s): 1943, 1977

Current Status: observes dst

Bulgaria (BG)

First Adoption: Year 1943

Abolition Year(s): 1944

Re-adoption Year(s): 1979

Current Status: observes dst

St Barthelemy (BL)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Bermuda (BM)

First Adoption: Year 1917

Abolition Year(s): 1918, 1945, 1952, 1956

Re-adoption Year(s): 1942, 1947, 1956, 1974

Current Status: observes dst

Caribbean NL (BQ)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Brazil (BR)

First Adoption: Year 1931

Abolition Year(s): 1932, 1952, 1963, 1967, 2018

Re-adoption Year(s): 1949, 1963, 1965, 1985

Current Status: abolished dst

Bahamas (BS)

First Adoption: Year 1918

Abolition Year(s): 1940, 1942

Re-adoption Year(s): 1942, 1945

Current Status: observes dst

Belarus (BY)

First Adoption: Year 1941

Abolition Year(s): 1941, 1944, 1989, 2010

Re-adoption Year(s): 1943, 1981, 1991

Current Status: abolished dst

Belize (BZ)

First Adoption: Year 1918

Abolition Year(s): 1942, 1945, 1967, 1973, 1982

Re-adoption Year(s): 1945, 1947, 1973, 1982

Current Status: abolished dst

Canada (CA)

First Adoption: Year 1916

Abolition Year(s): 1942

Re-adoption Year(s): 1944

Current Status: observes dst

Switzerland (CH)

First Adoption: Year 1941

Abolition Year(s): 1942

Re-adoption Year(s): 1981

Current Status: observes dst

Chile (CL)

First Adoption: Year 1927

Abolition Year(s): 1931, 1946, 2014

Re-adoption Year(s): 1946, 1968, 2016

Current Status: observes dst

China (CN)

First Adoption: Year 1919

Abolition Year(s): 1919, 1942, 1949, 1991

Re-adoption Year(s): 1940, 1946, 1986

Current Status: abolished dst

Costa Rica (CR)

First Adoption: Year 1979

Abolition Year(s): 1980, 1992

Re-adoption Year(s): 1991

Current Status: abolished dst

Cuba (CU)

First Adoption: Year 1928

Abolition Year(s): 1928, 1942, 1946, 2004

Re-adoption Year(s): 1940, 1945, 1965, 2007

Current Status: observes dst

Curaçao (CW)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Czech Republic (CZ)

First Adoption: Year 1916

Abolition Year(s): 1918, 1940, 1949

Re-adoption Year(s): 1940, 1943, 1979

Current Status: observes dst

Germany (DE)

First Adoption: Year 1916

Abolition Year(s): 1918, 1949

Re-adoption Year(s): 1940, 1980

Current Status: observes dst

Denmark (DK)

First Adoption: Year 1916

Abolition Year(s): 1918, 1940, 1949

Re-adoption Year(s): 1940, 1943, 1980

Current Status: observes dst

Dominica (DM)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Dominican Republic (DO)

First Adoption: Year 1966

Abolition Year(s): 1966, 1973

Re-adoption Year(s): 1969

Current Status: abolished dst

Algeria (DZ)

First Adoption: Year 1916

Abolition Year(s): 1921, 1939, 1945, 1971, 1978, 1980

Re-adoption Year(s): 1939, 1944, 1971, 1977, 1980

Current Status: abolished dst

Estonia (EE)

First Adoption: Year 1918

Abolition Year(s): 1918, 1941, 1944, 1999

Re-adoption Year(s): 1941, 1943, 1981, 2002

Current Status: observes dst

Egypt (EG)

First Adoption: Year 1940

Abolition Year(s): 1945, 2010, 2014

Re-adoption Year(s): 1957, 2014, 2023

Current Status: observes dst

Western Sahara (EH)

First Adoption: Year 1976

Abolition Year(s): 1978

Re-adoption Year(s): 2008

Current Status: observes dst

Spain (ES)

First Adoption: Year 1918

Abolition Year(s): 1919, 1924, 1929, 1938, 1946, 1949, 1967

Re-adoption Year(s): 1924, 1926, 1937, 1942, 1949, 1967, 1974

Current Status: observes dst

Finland (FI)

First Adoption: Year 1942

Abolition Year(s): 1942

Re-adoption Year(s): 1981

Current Status: observes dst

Fiji (FJ)

First Adoption: Year 1998

Abolition Year(s): 1999, 2020

Re-adoption Year(s): 2009

Current Status: abolished dst

Falkland Islands (FK)

First Adoption: Year 1937

Abolition Year(s): 1942, 2009

Re-adoption Year(s): 1983

Current Status: abolished dst

France (FR)

First Adoption: Year 1916

Abolition Year(s): 1940, 1945

Re-adoption Year(s): 1943, 1976

Current Status: observes dst

Britain (UK) (GB)

First Adoption: Year 1916

Abolition Year(s): 1968

Re-adoption Year(s): 1972

Current Status: observes dst

Grenada (GD)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Georgia (GE)

First Adoption: Year 1981

Abolition Year(s): 1996, 2004

Re-adoption Year(s): 1998

Current Status: abolished dst

Guernsey (GG)

First Adoption: Year 1916

Abolition Year(s): 1968

Re-adoption Year(s): 1972

Current Status: observes dst

Ghana (GH)

First Adoption: Year 1919

Abolition Year(s): 1941, 1955

Re-adoption Year(s): 1950

Current Status: abolished dst

Gibraltar (GI)

First Adoption: Year 1916

Abolition Year(s): 1956

Re-adoption Year(s): 1982

Current Status: observes dst

Guadeloupe (GP)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Greece (GR)

First Adoption: Year 1932

Abolition Year(s): 1932, 1941, 1943, 1952

Re-adoption Year(s): 1941, 1943, 1952, 1975

Current Status: observes dst

Guatemala (GT)

First Adoption: Year 1973

Abolition Year(s): 1973, 1983, 1991, 2006

Re-adoption Year(s): 1983, 1991, 2006

Current Status: abolished dst

Guam (GU)

First Adoption: Year 1959

Abolition Year(s): 1959, 1967, 1971, 1973, 1977

Re-adoption Year(s): 1967, 1969, 1973, 1976

Current Status: abolished dst

Hong Kong (HK)

First Adoption: Year 1941

Abolition Year(s): 1941, 1973, 1976, 1979

Re-adoption Year(s): 1946, 1975, 1979

Current Status: abolished dst

Honduras (HN)

First Adoption: Year 1987

Abolition Year(s): 1988, 2006

Re-adoption Year(s): 2006

Current Status: abolished dst

Croatia (HR)

First Adoption: Year 1941

Abolition Year(s): 1941, 1945

Re-adoption Year(s): 1943, 1983

Current Status: observes dst

Haiti (HT)

First Adoption: Year 1983

Abolition Year(s): 1997, 2006, 2015

Re-adoption Year(s): 2005, 2012, 2017

Current Status: observes dst

Hungary (HU)

First Adoption: Year 1916

Abolition Year(s): 1920, 1941, 1949, 1957

Re-adoption Year(s): 1941, 1943, 1954, 1980

Current Status: observes dst

Ireland (IE)

First Adoption: Year 1916

Abolition Year(s): 1940, 1968

Re-adoption Year(s): 1947, 1971

Current Status: observes dst

Israel (IL)

First Adoption: Year 1940

Abolition Year(s): 1940, 1946, 1957, 1975, 1980

Re-adoption Year(s): 1943, 1948, 1974, 1980, 1984

Current Status: observes dst

Isle of Man (IM)

First Adoption: Year 1916

Abolition Year(s): 1968

Re-adoption Year(s): 1972

Current Status: observes dst

Iran (IR)

First Adoption: Year 1977

Abolition Year(s): 1980, 2005, 2022

Re-adoption Year(s): 1991, 2008

Current Status: abolished dst

Iceland (IS)

First Adoption: Year 1917

Abolition Year(s): 1919, 1921, 1967

Re-adoption Year(s): 1921, 1939

Current Status: abolished dst

Italy (IT)

First Adoption: Year 1916

Abolition Year(s): 1920, 1940, 1948

Re-adoption Year(s): 1940, 1943, 1966

Current Status: observes dst

Jersey (JE)

First Adoption: Year 1916

Abolition Year(s): 1968

Re-adoption Year(s): 1972

Current Status: observes dst

Jordan (JO)

First Adoption: Year 1973

Abolition Year(s): 1978, 2012, 2022

Re-adoption Year(s): 1985, 2014

Current Status: abolished dst

St Kitts & Nevis (KN)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Korea (South) (KR)

First Adoption: Year 1948

Abolition Year(s): 1951, 1960, 1988

Re-adoption Year(s): 1955, 1987

Current Status: abolished dst

Lebanon (LB)

First Adoption: Year 1920

Abolition Year(s): 1923, 1961, 1978

Re-adoption Year(s): 1957, 1972, 1984

Current Status: observes dst

St Lucia (LC)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Liechtenstein (LI)

First Adoption: Year 1941

Abolition Year(s): 1942

Re-adoption Year(s): 1981

Current Status: observes dst

Lithuania (LT)

First Adoption: Year 1941

Abolition Year(s): 1941, 1944, 1999

Re-adoption Year(s): 1943, 1981, 2003

Current Status: observes dst

Luxembourg (LU)

First Adoption: Year 1916

Abolition Year(s): 1940, 1946

Re-adoption Year(s): 1943, 1977

Current Status: observes dst

Latvia (LV)

First Adoption: Year 1918

Abolition Year(s): 1919, 1941, 1944, 1999

Re-adoption Year(s): 1941, 1943, 1981, 2001

Current Status: observes dst

Libya (LY)

First Adoption: Year 1951

Abolition Year(s): 1951, 1953, 1955, 1989, 1997, 2013

Re-adoption Year(s): 1953, 1955, 1982, 1997, 2013

Current Status: abolished dst

Morocco (MA)

First Adoption: Year 1939

Abolition Year(s): 1940, 1950, 1967, 1974, 1978

Re-adoption Year(s): 1950, 1967, 1974, 1976, 2008

Current Status: observes dst

Monaco (MC)

First Adoption: Year 1916

Abolition Year(s): 1945

Re-adoption Year(s): 1976

Current Status: observes dst

Moldova (MD)

First Adoption: Year 1932

Abolition Year(s): 1941, 1944

Re-adoption Year(s): 1943, 1981

Current Status: observes dst

Montenegro (ME)

First Adoption: Year 1941

Abolition Year(s): 1941, 1945

Re-adoption Year(s): 1943, 1983

Current Status: observes dst

St Martin (French) (MF)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

North Macedonia (MK)

First Adoption: Year 1941

Abolition Year(s): 1941, 1945

Re-adoption Year(s): 1943, 1983

Current Status: observes dst

Mongolia (MN)

First Adoption: Year 1983

Abolition Year(s): 1998, 2006, 2016

Re-adoption Year(s): 2001, 2015

Current Status: abolished dst

Macau (MO)

First Adoption: Year 1942

Abolition Year(s): 1943, 1973, 1976, 1979

Re-adoption Year(s): 1946, 1975, 1979

Current Status: abolished dst

Northern Mariana Islands (MP)

First Adoption: Year 1959

Abolition Year(s): 1959, 1967, 1971, 1973, 1977

Re-adoption Year(s): 1967, 1969, 1973, 1976

Current Status: abolished dst

Montserrat (MS)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Malta (MT)

First Adoption: Year 1916

Abolition Year(s): 1920, 1940, 1948

Re-adoption Year(s): 1940, 1943, 1966

Current Status: observes dst

Mauritius (MU)

First Adoption: Year 1982

Abolition Year(s): 1982, 2008

Re-adoption Year(s): 2008

Current Status: abolished dst

Mexico (MX)

First Adoption: Year 1931

Abolition Year(s): 1931, 1940, 1943, 1945, 1948

Re-adoption Year(s): 1939, 1942, 1945, 1948, 1950

Current Status: observes dst

Malaysia (MY)

First Adoption: Year 1932

Abolition Year(s): 1932, 1941

Re-adoption Year(s): 1935

Current Status: abolished dst

Namibia (NA)

First Adoption: Year 1942

Abolition Year(s): 1942, 2017

Re-adoption Year(s): 1994

Current Status: abolished dst

New Caledonia (NC)

First Adoption: Year 1977

Abolition Year(s): 1978, 1996

Re-adoption Year(s): 1996

Current Status: abolished dst

Norfolk Island (NF)

First Adoption: Year 1974

Abolition Year(s): 1974

Re-adoption Year(s): 2019

Current Status: observes dst

Nicaragua (NI)

First Adoption: Year 1979

Abolition Year(s): 1980, 2006

Re-adoption Year(s): 2005

Current Status: abolished dst

Netherlands (NL)

First Adoption: Year 1916

Abolition Year(s): 1940, 1946

Re-adoption Year(s): 1943, 1977

Current Status: observes dst

Norway (NO)

First Adoption: Year 1916

Abolition Year(s): 1918, 1940, 1949, 1965

Re-adoption Year(s): 1940, 1943, 1959, 1980

Current Status: observes dst

New Zealand (NZ)

First Adoption: Year 1927

Abolition Year(s): 1940

Re-adoption Year(s): 1974

Current Status: observes dst

Peru (PE)

First Adoption: Year 1938

Abolition Year(s): 1939, 1987, 1990, 1994

Re-adoption Year(s): 1986, 1990, 1994

Current Status: abolished dst

Philippines (PH)

First Adoption: Year 1936

Abolition Year(s): 1936, 1941, 1945, 1954, 1977, 1990

Re-adoption Year(s): 1941, 1945, 1954, 1977, 1990

Current Status: abolished dst

Pakistan (PK)

First Adoption: Year 1942

Abolition Year(s): 1942, 2002, 2009

Re-adoption Year(s): 2002, 2008

Current Status: abolished dst

Poland (PL)

First Adoption: Year 1916

Abolition Year(s): 1919, 1940, 1949, 1964

Re-adoption Year(s): 1940, 1943, 1957, 1977

Current Status: observes dst

Puerto Rico (PR)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Palestine (PS)

First Adoption: Year 1940

Abolition Year(s): 1940, 1946, 1967, 1975, 1980

Re-adoption Year(s): 1943, 1957, 1974, 1980, 1984

Current Status: observes dst

Portugal (PT)

First Adoption: Year 1916

Abolition Year(s): 1921, 1924, 1929, 1932, 1966

Re-adoption Year(s): 1924, 1926, 1931, 1934, 1977

Current Status: observes dst

Romania (RO)

First Adoption: Year 1932

Abolition Year(s): 1939

Re-adoption Year(s): 1979

Current Status: observes dst

Serbia (RS)

First Adoption: Year 1941

Abolition Year(s): 1941, 1945

Re-adoption Year(s): 1943, 1983

Current Status: observes dst

Russia (RU)

First Adoption: Year 1916

Abolition Year(s): 1919, 1921, 1941, 1945, 2013

Re-adoption Year(s): 1921, 1940, 1943, 1981

Current Status: abolished dst

Sweden (SE)

First Adoption: Year 1916

Abolition Year(s): 1918, 1940, 1949

Re-adoption Year(s): 1940, 1943, 1980

Current Status: observes dst

Slovenia (SI)

First Adoption: Year 1941

Abolition Year(s): 1941, 1945

Re-adoption Year(s): 1943, 1983

Current Status: observes dst

Svalbard & Jan Mayen (SJ)

First Adoption: Year 1916

Abolition Year(s): 1918, 1940, 1949

Re-adoption Year(s): 1940, 1943, 1980

Current Status: observes dst

Slovakia (SK)

First Adoption: Year 1916

Abolition Year(s): 1918, 1940, 1949

Re-adoption Year(s): 1940, 1943, 1979

Current Status: observes dst

San Marino (SM)

First Adoption: Year 1916

Abolition Year(s): 1920, 1940, 1948

Re-adoption Year(s): 1940, 1943, 1966

Current Status: observes dst

St Maarten (Dutch) (SX)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Syria (SY)

First Adoption: Year 1920

Abolition Year(s): 1923, 1978, 1984, 2022

Re-adoption Year(s): 1962, 1983, 1986

Current Status: abolished dst

Turks & Caicos Is (TC)

First Adoption: Year 1979

Abolition Year(s): 2014

Re-adoption Year(s): 2018

Current Status: observes dst

Tunisia (TN)

First Adoption: Year 1939

Abolition Year(s): 1940, 1945, 1978, 1990, 2008

Re-adoption Year(s): 1942, 1977, 1988, 2005

Current Status: abolished dst

Tonga (TO)

First Adoption: Year 1999

Abolition Year(s): 2001, 2016

Re-adoption Year(s): 2016

Current Status: abolished dst

Turkey (TR)

First Adoption: Year 1916

Abolition Year(s): 1916, 1922, 1925, 1940, 1942, 1951, 1962, 1964, 1978, 1983, 2016

Re-adoption Year(s): 1920, 1924, 1940, 1942, 1946, 1962, 1964, 1973, 1983, 1985

Current Status: abolished dst

Trinidad & Tobago (TT)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Taiwan (TW)

First Adoption: Year 1946

Abolition Year(s): 1961, 1975, 1979

Re-adoption Year(s): 1974, 1979

Current Status: abolished dst

Ukraine (UA)

First Adoption: Year 1941

Abolition Year(s): 1941, 1944, 1990

Re-adoption Year(s): 1943, 1981, 1992

Current Status: observes dst

United States (US)

First Adoption: Year 1918

Abolition Year(s): 1942

Re-adoption Year(s): 1944

Current Status: observes dst

Uruguay (UY)

First Adoption: Year 1923

Abolition Year(s): 1925, 1942, 1960, 1965, 1968, 1970, 1972, 1974, 1979, 1992, 2014

Re-adoption Year(s): 1933, 1959, 1965, 1968, 1970, 1972, 1974, 1976, 1987, 2004

Current Status: abolished dst

Vatican City (VA)

First Adoption: Year 1916

Abolition Year(s): 1920, 1940, 1948

Re-adoption Year(s): 1940, 1943, 1966

Current Status: observes dst

St Vincent (VC)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Virgin Islands (UK) (VG)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Virgin Islands (US) (VI)

First Adoption: Year 1942

Abolition Year(s): 1942, 1945

Re-adoption Year(s): 1945

Current Status: abolished dst

Vanuatu (VU)

First Adoption: Year 1973

Abolition Year(s): 1973, 1992

Re-adoption Year(s): 1983

Current Status: abolished dst

Country DST Observance Matrix

Country Code First Adopted Status Abolition Years
Andorra AD 1985 observes dst None
Antigua & Barbuda AG 1942 abolished dst 1942, 1945
Anguilla AI 1942 abolished dst 1942, 1945
Albania AL 1940 observes dst 1940, 1943
Armenia AM 1981 abolished dst 1995, 2011
Antarctica AQ 1927 observes dst 1940, 1968
Argentina AR 1930 abolished dst 1941, 1943, 1946, 1968, 1974, 1992, 1999, 2008
Austria AT 1916 observes dst 1918, 1920, 1940, 1948
Australia AU 1916 observes dst 1918, 1943, 1951
Aruba AW 1942 abolished dst 1942, 1945
Åland Islands AX 1942 observes dst 1942
Azerbaijan AZ 1981 abolished dst 1992, 2015
Bosnia & Herzegovina BA 1941 observes dst 1941, 1945
Barbados BB 1942 abolished dst 1944, 1980
Bangladesh BD 2009 abolished dst 2009
Belgium BE 1916 observes dst 1940, 1946
Bulgaria BG 1943 observes dst 1944
St Barthelemy BL 1942 abolished dst 1942, 1945
Bermuda BM 1917 observes dst 1918, 1945, 1952, 1956
Brunei BN 1935 abolished dst 1941
Bolivia BO 1931 abolished dst 1931
Caribbean NL BQ 1942 abolished dst 1942, 1945
Brazil BR 1931 abolished dst 1932, 1952, 1963, 1967, 2018
Bahamas BS 1918 observes dst 1940, 1942
Botswana BW 1943 abolished dst 1943
Belarus BY 1941 abolished dst 1941, 1944, 1989, 2010
Belize BZ 1918 abolished dst 1942, 1945, 1967, 1973, 1982
Canada CA 1916 observes dst 1942
Switzerland CH 1941 observes dst 1942
Cook Islands CK 1978 abolished dst 1990
Chile CL 1927 observes dst 1931, 1946, 2014
China CN 1919 abolished dst 1919, 1942, 1949, 1991
Colombia CO 1992 abolished dst 1992
Costa Rica CR 1979 abolished dst 1980, 1992
Cuba CU 1928 observes dst 1928, 1942, 1946, 2004
Cape Verde CV 1942 abolished dst 1942
Curaçao CW 1942 abolished dst 1942, 1945
Cyprus CY 1975 observes dst None
Czech Republic CZ 1916 observes dst 1918, 1940, 1949
Germany DE 1916 observes dst 1918, 1949
Denmark DK 1916 observes dst 1918, 1940, 1949
Dominica DM 1942 abolished dst 1942, 1945
Dominican Republic DO 1966 abolished dst 1966, 1973
Algeria DZ 1916 abolished dst 1921, 1939, 1945, 1971, 1978, 1980
Ecuador EC 1992 abolished dst 1992
Estonia EE 1918 observes dst 1918, 1941, 1944, 1999
Egypt EG 1940 observes dst 1945, 2010, 2014
Western Sahara EH 1976 observes dst 1978
Spain ES 1918 observes dst 1919, 1924, 1929, 1938, 1946, 1949, 1967
Finland FI 1942 observes dst 1942
Fiji FJ 1998 abolished dst 1999, 2020
Falkland Islands FK 1937 abolished dst 1942, 2009
Faroe Islands FO 1981 observes dst None
France FR 1916 observes dst 1940, 1945
Britain (UK) GB 1916 observes dst 1968
Grenada GD 1942 abolished dst 1942, 1945
Georgia GE 1981 abolished dst 1996, 2004
Guernsey GG 1916 observes dst 1968
Ghana GH 1919 abolished dst 1941, 1955
Gibraltar GI 1916 observes dst 1956
Greenland GL 1980 observes dst None
Guadeloupe GP 1942 abolished dst 1942, 1945
Greece GR 1932 observes dst 1932, 1941, 1943, 1952
Guatemala GT 1973 abolished dst 1973, 1983, 1991, 2006
Guam GU 1959 abolished dst 1959, 1967, 1971, 1973, 1977
Hong Kong HK 1941 abolished dst 1941, 1973, 1976, 1979
Honduras HN 1987 abolished dst 1988, 2006
Croatia HR 1941 observes dst 1941, 1945
Haiti HT 1983 observes dst 1997, 2006, 2015
Hungary HU 1916 observes dst 1920, 1941, 1949, 1957
Ireland IE 1916 observes dst 1940, 1968
Israel IL 1940 observes dst 1940, 1946, 1957, 1975, 1980
Isle of Man IM 1916 observes dst 1968
India IN 1941 abolished dst 1942
Iraq IQ 1982 abolished dst 2007
Iran IR 1977 abolished dst 1980, 2005, 2022
Iceland IS 1917 abolished dst 1919, 1921, 1967
Italy IT 1916 observes dst 1920, 1940, 1948
Jersey JE 1916 observes dst 1968
Jamaica JM 1974 abolished dst 1983
Jordan JO 1973 abolished dst 1978, 2012, 2022
Japan JP 1948 abolished dst 1951
Kyrgyzstan KG 1981 abolished dst 2005
St Kitts & Nevis KN 1942 abolished dst 1942, 1945
Korea (South) KR 1948 abolished dst 1951, 1960, 1988
Kazakhstan KZ 1981 abolished dst 2004
Lebanon LB 1920 observes dst 1923, 1961, 1978
St Lucia LC 1942 abolished dst 1942, 1945
Liechtenstein LI 1941 observes dst 1942
Sri Lanka LK 1942 abolished dst 1942
Lesotho LS 1942 abolished dst 1943
Lithuania LT 1941 observes dst 1941, 1944, 1999
Luxembourg LU 1916 observes dst 1940, 1946
Latvia LV 1918 observes dst 1919, 1941, 1944, 1999
Libya LY 1951 abolished dst 1951, 1953, 1955, 1989, 1997, 2013
Morocco MA 1939 observes dst 1940, 1950, 1967, 1974, 1978
Monaco MC 1916 observes dst 1945
Moldova MD 1932 observes dst 1941, 1944
Montenegro ME 1941 observes dst 1941, 1945
St Martin (French) MF 1942 abolished dst 1942, 1945
Madagascar MG 1954 abolished dst 1954
North Macedonia MK 1941 observes dst 1941, 1945
Mongolia MN 1983 abolished dst 1998, 2006, 2016
Macau MO 1942 abolished dst 1943, 1973, 1976, 1979
Northern Mariana Islands MP 1959 abolished dst 1959, 1967, 1971, 1973, 1977
Martinique MQ 1980 abolished dst 1980
Montserrat MS 1942 abolished dst 1942, 1945
Malta MT 1916 observes dst 1920, 1940, 1948
Mauritius MU 1982 abolished dst 1982, 2008
Mexico MX 1931 observes dst 1931, 1940, 1943, 1945, 1948
Malaysia MY 1932 abolished dst 1932, 1941
Namibia NA 1942 abolished dst 1942, 2017
New Caledonia NC 1977 abolished dst 1978, 1996
Norfolk Island NF 1974 observes dst 1974
Nicaragua NI 1979 abolished dst 1980, 2006
Netherlands NL 1916 observes dst 1940, 1946
Norway NO 1916 observes dst 1918, 1940, 1949, 1965
New Zealand NZ 1927 observes dst 1940
Peru PE 1938 abolished dst 1939, 1987, 1990, 1994
Philippines PH 1936 abolished dst 1936, 1941, 1945, 1954, 1977, 1990
Pakistan PK 1942 abolished dst 1942, 2002, 2009
Poland PL 1916 observes dst 1919, 1940, 1949, 1964
St Pierre & Miquelon PM 1987 observes dst None
Puerto Rico PR 1942 abolished dst 1942, 1945
Palestine PS 1940 observes dst 1940, 1946, 1967, 1975, 1980
Portugal PT 1916 observes dst 1921, 1924, 1929, 1932, 1966
Paraguay PY 1975 abolished dst 2024
Romania RO 1932 observes dst 1939
Serbia RS 1941 observes dst 1941, 1945
Russia RU 1916 abolished dst 1919, 1921, 1941, 1945, 2013
Sudan SD 1970 abolished dst 1985
Sweden SE 1916 observes dst 1918, 1940, 1949
Singapore SG 1932 abolished dst 1932
Slovenia SI 1941 observes dst 1941, 1945
Svalbard & Jan Mayen SJ 1916 observes dst 1918, 1940, 1949
Slovakia SK 1916 observes dst 1918, 1940, 1949
Sierra Leone SL 1932 abolished dst 1939
San Marino SM 1916 observes dst 1920, 1940, 1948
South Sudan SS 1970 abolished dst 1985
El Salvador SV 1987 abolished dst 1988
St Maarten (Dutch) SX 1942 abolished dst 1942, 1945
Syria SY 1920 abolished dst 1923, 1978, 1984, 2022
Eswatini (Swaziland) SZ 1942 abolished dst 1943
Turks & Caicos Is TC 1979 observes dst 2014
Chad TD 1979 abolished dst 1979
Tajikistan TJ 1981 abolished dst 1991
Turkmenistan TM 1981 abolished dst 1991
Tunisia TN 1939 abolished dst 1940, 1945, 1978, 1990, 2008
Tonga TO 1999 abolished dst 2001, 2016
Turkey TR 1916 abolished dst 1916, 1922, 1925, 1940, 1942, 1951, 1962, 1964, 1978, 1983, 2016
Trinidad & Tobago TT 1942 abolished dst 1942, 1945
Taiwan TW 1946 abolished dst 1961, 1975, 1979
Ukraine UA 1941 observes dst 1941, 1944, 1990
US minor outlying islands UM 1956 abolished dst 1956
United States US 1918 observes dst 1942
Uruguay UY 1923 abolished dst 1925, 1942, 1960, 1965, 1968, 1970, 1972, 1974, 1979, 1992, 2014
Uzbekistan UZ 1981 abolished dst 1991
Vatican City VA 1916 observes dst 1920, 1940, 1948
St Vincent VC 1942 abolished dst 1942, 1945
Virgin Islands (UK) VG 1942 abolished dst 1942, 1945
Virgin Islands (US) VI 1942 abolished dst 1942, 1945
Vanuatu VU 1973 abolished dst 1973, 1992
Samoa (western) WS 2010 abolished dst 2020
South Africa ZA 1942 abolished dst 1943