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Daylight saving time by country

From Wikipedia - Reading time: 17 min

Daylight saving time (DST) by country
  Observes DST around the Northern Hemisphere summer
  Observes DST around the Southern Hemisphere summer
  Formerly observed DST
  Never observed DST

Daylight saving time (DST), also known as summer time, is the practice of advancing clocks during part of the year, typically by one hour around spring and summer, so that daylight ends at a later time of the day. As of 2024, DST is observed in most of Europe, most of North America and parts of Africa and Asia around the Northern Hemisphere summer, and in parts of South America and Oceania around the Southern Hemisphere summer. It was also formerly observed in other areas.

Scheduled observance

[edit]
Daylight saving time in the world. Areas shown in the same color start and end DST within less than a week of each other.

As of November 2024, the following locations were scheduled to start and end DST at the following times:[1][2]

Locations DST start DST end Shift
Second Sunday in March at 02:00 First Sunday in November at 02:00 1 hour
Second Sunday in March at 00:00 First Sunday in November at 01:00 1 hour
Last Sunday in March at 01:00 UTC Last Sunday in October at 01:00 UTC 1 hour
Last Sunday in March at 02:00 Last Sunday in October at 03:00 1 hour
Last Sunday in March at 00:00 Last Sunday in October at 00:00 1 hour
Friday before last Sunday in March at 02:00 Last Sunday in October at 02:00 1 hour
Second Saturday after Ramadan[b] at 02:00 Saturday before last Sunday in October at 02:00 1 hour
Last Friday in April at 00:00 Last Thursday in October at 24:00 1 hour
First Saturday in September at 24:00 UTC−04:00[c] First Saturday in April at 24:00 UTC−03:00[c] 1 hour
First Sunday in October at 02:00 First Sunday in April at 03:00 1 hour
First Sunday in October at 02:00 First Sunday in April at 02:00 30 minutes
Last Sunday in September at 02:00 UTC+12:00[d] First Sunday in April at 02:00 UTC+12:00[d] 1 hour

In the table above, the DST start and end times refer to the local time before each change occurs, unless otherwise specified. The shift is the amount of time added at the DST start time and subtracted at the DST end time. For example, in Canada and the United States, when DST starts, the local time changes from 02:00 to 03:00, and when DST ends, the local time changes from 02:00 to 01:00. As the time change depends on the time zone, it does not occur simultaneously in all parts of these countries. Conversely, in almost all parts of Europe that observe DST, the time change occurs simultaneously at 01:00 UTC regardless of their time zone.

Morocco, including the portion of Western Sahara that it administers, also observes an annual time change but not related to seasonal daylight. The local time is decreased by one hour on the Sunday before Ramadan at 03:00, and increased by one hour on the Sunday after Ramadan at 02:00 (in 2024, the dates are 10 March and 14 April).

Past observance

[edit]
Location Last year of time changes[e] Notes[1]
Akrotiri and Dhekelia Observed DST since 1939.
Albania Observed DST in 1940–1943, and since 1974.
Algeria 1981 Observed DST in 1916–1921, in the autumn of 1939, in 1944–1945, 1971, 1977–1978, and 1980–1981.
Andorra Observed DST since 1985.
Argentina 2009 Observed DST in 1930–1969, 1974, 1988–2000, and 2007–2009.
Armenia 2011 Observed DST in 1981–1995, 1997–2011.[7]
Australia
Main article: Daylight saving time in Australia
DST used only in the Australian Capital Territory, Jervis Bay Territory, New South Wales, Norfolk Island, South Australia, Tasmania, and Victoria.
Austria Observed DST in 1916–1918, 1920, 1940–1948 (as part of Germany between 1940 and 1945) and since 1980.
Azerbaijan 2015 Observed DST in 1981–1992 and 1996–2015.
Bahamas Observed DST since 1964.
Bangladesh 2009 Observed DST during World War II from 1942 to 1945 as a part of the Bengal Presidency of India. Also observed in 2009.
Barbados 1980 Observed DST from 1977 to 1980.
Belarus 2010 Observed DST in 1941–1944, 1981–2010.
Belgium Observed DST in 1916–1940, 1942–1946 and since 1977.
Belize 1983 Observed DST in 1973–1974 and 1982–1983.
Bermuda Observed DST since 1974.
Bolivia 1932 Observed DST in 1931–1932.
Bosnia and Herzegovina Observed DST in 1916–1918 when it was part of Austria-Hungary, in 1941–1945 and since 1983 when it was part of Yugoslavia or independent.
Botswana 1944 Observed DST in 1943–1944.
Brazil 2019 Observed DST in 1931–1933, 1949–1953, 1963–1968, and 1985–2019.
Bulgaria Observed DST in 1943–1944 and since 1979.
Canada
Main article: Daylight saving time in Canada
Yukon, most of Saskatchewan, and parts of British Columbia, Nunavut, Ontario and Quebec do not observe DST. Yukon and most of Saskatchewan use time zones equivalent to permanent DST.[8]
Cape Verde 1945 Observed DST in 1942–1945.
Chad 1980 Observed DST in winter 1979–1980.
Chile Observed DST in 1927–1946 (excluding Easter Island, which observed it in 1932–1946) and from 1968 to 2015. Chile observed year-round DST in 2015, but reintroduced regular DST in 2016. Magallanes Region does not observe DST since December 2016.
China 1991 Observed DST in 1940–1941 (when it was Republic of China) and 1986–1991.
Colombia 1993 Observed DST in 1992–1993.
Cook Islands 1991 Observed DST in 1978–1991.
Costa Rica 1992 Observed DST in 1954, 1979–1980 and 1991–1992.
Croatia Observed DST in 1916–1918 when it was part of Austria-Hungary, in 1941–1945 and since 1983 when it was part of Yugoslavia or independent.
Cuba Observed DST in 1928, 1940–1942, 1945–1946, and since 1965.
Cyprus Observed DST since 1975.
Czech Republic Observed DST in 1916–1918 when it was part of Austria-Hungary, 1940–1949 and since 1979 when it was part of Czechoslovakia or independent.
Denmark Observed DST in 1916, 1940–1948, and since 1980.
Dominican Republic 1974 Observed DST in 1966–1967, 1969–1974.
Egypt Observed DST in 1940–1945, 1957–2010, 2014, and since 2023.
El Salvador 1988 Observed DST in 1987–1988.
Estonia Observed DST in 1918, 1940–1944, 1981–1988, 1997–1999, and since 2002.
Faroe Islands Observed DST since 1981.
Falkland Islands 2010 Observed DST in 1937–1942 and 1983–2010.
Fiji 2021
Main article: Daylight saving time in Fiji
Observed DST in 1998–2000 and 2009–2021.
Finland Observed DST in 1942 and since 1981.
France Observed DST in 1916–1945 and since 1976.
Georgia 2005 Observed DST in 1981–2005.
Germany Observed DST in 1916–1918, 1940–1949, and since 1980.
Ghana 1942 Observed DST in 1936–1942.
Greece Observed DST in 1932–1952 and since 1975.
Greenland Observed DST since 1980. Follows European Union practice as part of the Kingdom of Denmark, hence start and end times correspond to 01:00 UTC on the respective Sunday. See Daylight saving time in the Americas—Greenland. The Pituffik Space Base uses the DST schedule of Canada and the United States. Stations on the east coast of Northeast Greenland National Park do not observe DST.[f]
Guatemala 2006 Observed DST in 1973–1974, 1983, 1991, and 2006.
Guernsey Observed DST in 1916–1968 and since 1972.
Haiti Observed DST in 1983–1997, 2005–2006, 2012–2015, and since 2017.
Honduras 2006 Observed DST in 1987–1988 and 2006.
Hong Kong 1979 Observed DST in 1941, 1945–1976, and 1979.
Hungary Observed DST in 1916–1920, 1941–1950, 1954–1957, and since 1980.
Iceland 1968 Observed DST in 1917–1918 and 1939–1968.
India 1945 Observed DST during World War II from 1941 to 1945. Briefly observed during the Sino-Indian War of 1962 and the Indo–Pakistani Wars of 1965 and 1971.
Indonesia 1963 Observed various DST offsets in 1924–1963.
Iraq 2007 Observed DST in 1982–2007.
Iran 2022
Main article: Daylight saving time in Iran
Observed DST in 1977–1980, 1991–2005, and 2008–2022.
Ireland Observed DST in 1916–1968 and since 1972.
Isle of Man Observed DST in 1916–1968 and since 1972.
Israel
Main article: Israel Summer Time
Observed DST in 1940–1946, 1948–1957, 1974–1975, 1980, and since 1984.
Italy Observed DST in 1916–1920, 1940–1948, and since 1966.
Jamaica 1983 Observed DST in 1974–1983.
Japan 1951 Observed DST in 1948–1951.
Jersey Observed DST in 1916–1968 and since 1971.
Jordan 2022 Observed DST with annual time changes in 1973–1978 and 1985–2011, permanently in 2012–2013, with annual time changes in 2014–2022, and permanently since 2022.
Kazakhstan 2004 Observed DST in 1981–1990 and 1992–2004.
Kosovo Observed DST 1941–1945 and since 1983 when it was part of Yugoslavia, Serbia and Montenegro, Serbia or independent.
Kyrgyzstan 2005 Observed DST in 1981–2005.
Latvia Observed DST in 1918–1919, 1941–1944, and since 1981.
Lebanon Observed DST in 1920–1923, 1957–1961, 1972–1978, and since 1984.
Lesotho 1944 Observed DST in 1943–1944.
Libya 2013 Observed DST in 1951–1959, 1982–1989, 1996–1997, and 2012–2013.
Liechtenstein Observed DST since 1981.
Lithuania Observed DST in 1941–1944, 1981–1999, and since 2003.
Luxembourg Observed DST in 1916–1946 and since 1977.
Macau 1979 Observed DST in 1941–1943, 1945–1976 and 1979.
Madagascar 1954 Observed DST in 1954.
Malaysia 1936 Observed DST in 1933–1936. The time zone in Malaysia also changed many times in the past.
Malta Observed DST in 1916–1920, 1940–1948, and since 1966.
Martinique 1980 Observed DST in 1980.
Mauritius 2009 Observed DST in 1982–1983 and 2008–2009.
Mexico
Main article: Daylight saving time in Mexico
Baja California started observing DST in 1976. Durango, Coahuila, Nuevo León and Tamaulipas observed DST in 1988. The whole country started observing DST in 1996, but Sonora discontinued the observance after 1998, Quintana Roo after 2014, and the rest of the country after 2022, except Baja California and municipalities near the U.S. border in Chihuahua, Coahuila, Nuevo León and Tamaulipas, which continued observing DST according to the U.S. schedule.
Midway Atoll 1956 Observed DST in 1956.
Moldova Observed DST in 1932–1944, 1981–1989, and since 1991.
Monaco Observed DST in 1916–1945 and since 1976.
Mongolia 2016 Observed DST in 1983–1998, 2001–2006, and 2015–2016.
Montenegro Observed DST 1941–1945 and since 1983 when it was part of Yugoslavia, Serbia and Montenegro or independent.
Morocco 2018 Observed DST in 1939–1945, 1950, 1967, 1974, 1976–1978, and 2008–2018. In 2012–2018, DST was suspended during the month of Ramadan. Since 2018 Morocco uses UTC+1 all year, equivalent to permanent DST, except during the month of Ramadan, when it observes UTC±0.
Namibia 2017 Adopted standard time of UTC+2 in 1903. Observed annual changes to summer time in 1942–1943 (UTC+3 summer, UTC+2 standard). Observed annual changes to winter time in 1994–2017 (UTC+2 standard, UTC+1 winter) in all regions except Zambezi, which remained in UTC+2 all year.[10]
Netherlands Observed DST in 1916–1945 and since 1977.
New Caledonia 1997 Observed DST in 1977–1979 and 1996–1997.
New Zealand Observed DST in 1927–1946 and since 1974.
Nicaragua 2006 Observed DST in 1973–1975, 1979–1980, 1992–1994, and 2005–2006.
Norfolk Island Observed DST in 1974–1975 and since 2019.[11]
North Macedonia Observed DST in 1941–1945 and since 1983 when it was part of Yugoslavia or independent.
Northern Cyprus Observed DST since 2017. Maintained permanent DST from September 2016 to October 2017.[12]
Norway Observed DST in 1916, 1940–1945, 1959–1965, and since 1980. Follows European Union practice, although not a member.
Pakistan 2009 Observed DST in 1942–1945 as a part of the British Raj. Also observed in 2002 and from 2008 to 2009.
Palestine Since 1974, observed DST in the same years when Israel did, but not always with the same start and end dates.
Paraguay 2024 Observed DST in 1975–2024. In October 2024 adopted UTC–3, equivalent to permanent DST.[13]
Peru 1994 Observed DST in 1938–1940, 1986–1987, 1990, and 1994.
Philippines 1990 Observed DST in 1936–1937, 1954, 1978, and 1990.
Poland Observed DST in 1916–1919, 1940–1949, 1957–1964, and since 1977.
Portugal Observed DST in 1916–1921, 1924, 1926–1929, 1931–1932, 1934–1949, 1951–1965, and since 1977.
Puerto Rico 1945 Observed DST in 1942–1945.
Romania First time when DST was observed in Romania was in 1917, due to World War I. Observed DST in 1932–1939 and since 1979.
Russia 2014 Observed DST in 1917–1919, 1921 (some areas), and 1981–2010. In 2011–2014, used permanent DST. In 2014, left permanent DST and switched to permanent standard time.[14]
Saint Pierre and Miquelon Observed DST since 1987.
Samoa 2021
Main article: Daylight saving time in Samoa
Observed DST in 2010–2021.
San Marino Observed DST in 1916–1920, 1940–1948, and since 1966.
Serbia Observed DST in 1941–1945 and since 1983 when it was part of Yugoslavia, Serbia and Montenegro or independent.[15]
Sierra Leone 1962 Observed DST in 1935–1942 and 1957–1962.
Singapore 1935 Observed DST in 1933–1935 by adding 20 minutes to standard time. On January 1, 1936, country changed their time zone to UTC+07:20.[16]
Slovakia Observed DST in 1916–1918 when it was part of Austria-Hungary, 1940–1949 and since 1979 when it was part of Czechoslovakia or independent.
Slovenia Observed DST in 1916–1918 when it was part of Austria-Hungary, in 1941–1945 and since 1983 when it was part of Yugoslavia or independent.
South Africa 1944 Observed DST in 1942–1944.
South Korea 1988 Observed DST in 1948–1951, 1955–1960, and 1987–1988.
South Sudan 1985 Observed DST in 1970–1985, when it was part of Sudan.
Spain Observed DST in 1917–1919, 1924, 1926–1929, 1937–1946, 1949, and since 1974. The Canary Islands observed DST since 1980.
Sri Lanka 2006 Observed DST during the World War II, from 1942 to 1945 just as the rest of the Indian subcontinent. Advanced one hour to UTC+6:30 in May 1996, reduced 30 minutes to UTC+6 in October 1996, and reduced 30 minutes to UTC+5:30 in April 2006.
Sudan 1985 Observed DST in 1970–1985.
Sweden Observed DST 15 May–30 September 1916, in a test run. Observed DST since 1980. Dates: 1980, first Sunday of April to last Sunday of September; 1981–1995, last Sunday of March to last Sunday of September; since 1996, last Sunday of March to last Sunday of October.
Switzerland Observed DST in 1941–1942 and since 1981. Follows European Union practice, although not a member.
Syria 2022 Observed DST in 1920–1923, 1962–1978, 1983–1984, and 1986–2022. In 2022 switched to UTC+03:00, equivalent to permanent DST.
Taiwan 1979 Observed DST in 1945–1962, 1974, 1975, and 1979.
Tajikistan 1991 Observed DST in 1981–1991.
Tonga 2017 Observed DST in 1999–2002 and 2016–2017.
Tunisia 2008 Observed DST in 1939–1945, 1977–1978, 1988–1990, and 2005–2008.
Turkey 2016
Main article: Daylight saving time in Turkey
Observed DST in 1916, 1920–1922, 1924–1925, 1940–1942, 1945–1951, 1962, 1964, 1970–1983, and 1985–2016. Followed European Union practice in general. In 2016, Turkey adopted the new Turkey Time time zone (UTC+03:00), moving in effect to permanent DST.
Turkmenistan 1991 Observed DST in 1981–1991.
Turks and Caicos Observed DST in 1979–2015 and since 2018.
Ukraine Observed DST in 1941–1943, 1981–1989, and since 1992. Follows European Union practice, although not a member. Since 2014, occupied territories of Ukraine do not de facto observe DST.
United Kingdom
Main article: British Summer Time
Observed DST (commonly referred to as British Summer Time (BST)) since 1916. Year-round Summer Time (BST) + Double Summer Time (BDST) 1940–1945. Two-stage Double Summer Time (BDST) 1947. Year-round Summer Time (BST) 1968–1971. Follows European Union practice, although no longer a member.
United States
Main article: Daylight saving time in the United States
Arizona (except the Navajo Nation) and Hawaii do not observe DST.[8] Year-round DST observed in 1942–1945 and 1974–1975.
Uruguay 2015 Observed DST in 1923–1926, 1933–1943, 1959–1960, 1965–1970, 1972, 1974–1980, 1987–1993, and 2004–2015.[17]
Uzbekistan 1991 Observed DST in 1981–1991.
Vanuatu 1993 Observed DST in 1983–1993.
Vatican City Observed DST in 1916–1920, 1940–1948, and since 1966.
Western Sahara 2018 The portion administered by Morocco since 1976 observed DST whenever the country did.

Proposals to abolish seasonal changes

[edit]

Many countries and territories have abolished annual time changes after observing them for many years: Argentina, Armenia, Azerbaijan, Belarus, Brazil, Cook Islands, Falkland Islands, Fiji, Georgia, Hong Kong, Iceland, Iran, Iraq, Jamaica, Jordan, Kazakhstan, Kyrgyzstan, Macau, Mongolia, Namibia, Paraguay, Russia, Samoa, Sudan, Syria, Turkey, Uruguay, Vanuatu, and most of Mexico. To select the time to be used all year, some of them adopted the time previously used outside their DST period, but others adopted the time previously used during their DST period, an effect known as "permanent DST".

European Union

[edit]

On 8 February 2018, the European Parliament voted to ask the European Commission to re-evaluate DST in the European Union.[18] An online survey was performed between 4 July and 16 August 2018, in which 4.6 million EU citizens[19] responded. The survey was especially popular in Germany, resulting in 68% of all respondents located in that country.[20] Out of all the participants, about 84% did not desire to adjust clocks twice annually.[19] Based on this poll, on 12 September 2018 the European Commission decided to propose an end to seasonal clock changes (repealing Directive 2000/84/EC).[21] In order for this proposal to be valid, the European Union legislative procedure must be followed, mainly that the Council of the European Union and the European Parliament must both approve it.

The seasonal changes were supposed to stop in 2021, but the Council of the European Union asked the European Commission for a detailed impact assessment before countries would decide on how to proceed.[20]

United States

[edit]
Main article: Daylight saving time in the United States

Since 2018, several U.S. states have passed laws to abolish seasonal changes and adopt permanent DST, but these laws cannot take effect without approval from the federal government.[22] States may freely choose whether to observe DST or not, but if they observe it they must follow the national schedule, and changing their standard time also requires approval from the federal government.

The Sunshine Protection Act would change federal law to abolish annual time changes and permanently advance by one hour the standard time in all areas of the United States that previously observed DST, effectively adopting permanent DST, from 2023. The proposal passed the Senate with unanimous consent on March 15, 2022, but expired without consideration by the House of Representatives.[23]

See also

[edit]

Notes

[edit]
  1. ^ Member states of the European Union (EU):

    Austria
    Belgium
    Bulgaria
    Croatia
    Cyprus
    Czech Republic
    Denmark[g]
    Estonia
    Finland[h]

    France[i]
    Germany
    Greece
    Hungary
    Ireland
    Italy
    Latvia
    Lithuania
    Luxembourg

    Malta
    Netherlands[j]
    Poland
    Portugal[k]
    Romania
    Slovakia
    Slovenia
    Spain[l]
    Sweden

  2. ^ 20 April 2024, 12 April 2025.[3]
  3. ^ a b The time changes occur at Saturday 24:00 Continental Chile Time (UTC–04:00 standard time, UTC–03:00 DST) simultaneously in all parts of the country that observe DST. Accordingly, in Continental Chile except Magallanes Region, and in Juan Fernández Islands and Desventuradas Islands, when DST starts, the local time changes from Saturday 24:00 (Sunday 00:00) to Sunday 01:00, and when DST ends, from Saturday 24:00 to 23:00; in Easter Island and Salas y Gómez Island (UTC–06:00 standard time, UTC–05:00 DST), when DST starts, the local time changes from Saturday 22:00 to 23:00, and when DST ends, from Saturday 22:00 to 21:00.[4][5]
  4. ^ a b The time changes occur at 02:00 New Zealand Standard Time (UTC+12:00) simultaneously in all parts of the country that observe DST. Accordingly, in the regions of New Zealand, when DST starts, the local time changes from 02:00 to 03:00, and when DST ends, from 03:00 to 02:00; in the Chatham Islands (UTC+12:45 standard time, UTC+13:45 DST), when DST starts, the local time changes from 02:45 to 03:45, and when DST ends, from 03:45 to 02:45.[6]
  5. ^ The year is listed only for areas that no longer observe DST.
  6. ^ The government of Greenland specified that the portion of Greenland observing UTC–3 would change its standard time to UTC–2 in March 2023, not observe DST in 2023, and resume observing DST in future years as UTC–1 from March to October.[9]
  7. ^ The Faroe Islands and Greenland are not part of the EU and are listed separately.
  8. ^ Including Åland.
  9. ^ Some parts of Overseas France are part of the EU but do not observe DST.
  10. ^ Only the European part of the Netherlands is part of the EU and observes DST.
  11. ^ Including Azores and Madeira.
  12. ^ Including the Canary Islands, Ceuta, Melilla and plazas de soberanía.

References

[edit]
  1. ^ a b "The World Clock (extended version)". timeanddate.com. Retrieved 1 March 2023.. Detailed DST information about each location, current and historical, can be found under the relevant section of this website, and can be referred to for information in this article unless otherwise specified.
  2. ^ "Time zone database and code". Paul Eggert.
  3. ^ "قرار مجلس الوزراء رقم (18/240/13/م.و/م.ا) لعام 2024م" [Decision of the Council of Ministers no. 18/240/13 for year 2024] (PDF) (in Arabic). Council of Ministers of Palestine. 22 January 2024.
  4. ^ "Decreto 224: Modifica decreto supremo Nº 1.286 del Ministerio del Interior y Seguridad Pública del año 2018, disponiendo cambios en la hora oficial de Chile Continental, de la Región de Magallanes y la Antártica Chilena y de Chile Insular Occidental" [Decree 224: Modifies supreme decree no. 1286 of the Ministry of the Interior and Public Security of year 2018, providing changes in the official time of Continental Chile, of the Region of Magallanes and Chilean Antarctica, and of Western Insular Chile] (in Spanish). Library of the National Congress of Chile. 13 August 2022.
  5. ^ "Que no lo pille desprevenido: este fin de semana cambia la hora" [Don't be caught off guard: this weekend the time changes] (in Spanish). Government of Chile. 8 September 2022.
  6. ^ "New Zealand Daylight Time Order 2007". New Zealand Government. 6 July 2007.
  7. ^ "Clock changes in Yerevan". World Clock. timeanddate.com. Retrieved 20 February 2013.
  8. ^ a b "Sunday, March 10: Daylight Saving Time Begins in USA & Canada". Time Zone News. timeanddate.com. Retrieved 20 February 2013.
  9. ^ Announcement on changing of standard time for Greenland, Government of Greenland, 3 March 2023.
  10. ^ "GRN evaluates winter time change". New Era. 24 March 2016. p. 1.
  11. ^ "DST Begins in Australia and New Zealand".
  12. ^ "Time Zone in North Nicosia, Northern Cyprus". timeanddate.
  13. ^ "Peña promulga horario de verano todo el año" [Peña enacts summer time all year]. ABC Color (in Spanish). 14 October 2024. Retrieved 14 October 2024.
  14. ^ "Russia returns to permanent Standard Time". timeanddate.com. Retrieved 25 October 2014.
  15. ^ "Serbia to legislate Daylight Saving Time, EU may end it - English - on B92.net". 20 August 2018.
  16. ^ "Time zone in Singapore". Daylight Saving Time. timeanddate.com. Retrieved 21 February 2013.
  17. ^ "No habrá cambio de hora este verano".
  18. ^ "EU Parliament Votes to Re-Evaluate DST in Europe". www.timeanddate.com.
  19. ^ a b "Summertime Consultation: 84% want Europe to stop changing the clock" (Press release). Brussels: European Commission. 31 August 2018.
  20. ^ a b "Stopping the clock on seasonal time changes? Not anytime soon". POLITICO. 2020-10-24. Retrieved 2021-03-22.
  21. ^ "State of the Union 2018: Q&A on the Commission's proposal to put an end to seasonal clock changes" (Press release). Strasbourg: European Commission. 12 September 2018.
  22. ^ "Daylight Saving Time | State Legislation". National Conference of State Legislatures. May 4, 2022.
  23. ^ "S.623 – Sunshine Protection Act of 2021". United States Congress.
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