Daylight saving time (DST), also known as summer time, is the practice of advancing clocks during part of the year, typically by one hour aroundspring andsummer, so that daylight ends at a later time of the day. As of 2025[update], DST is observed in most ofEurope, most ofNorth America and parts ofAfrica andAsia around theNorthern Hemisphere summer, and in parts ofSouth America andOceania around theSouthern Hemisphere summer. It was also formerly observed in other areas.
As of 2025[update], 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 01:00UTC | Last Sunday in October at 01:00UTC | 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 afterRamadan[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 24:00UTC−04:00[c] | First Saturday in April at 24:00UTC−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 02:00UTC+12:00[d] | First Sunday in April at 03:00UTC+13:00[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, inCanada and theUnited 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 ofEurope that observe DST, the time change occurs simultaneously at 01:00UTC regardless of their time zone.
Morocco, including the portion ofWestern 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 beforeRamadan at 03:00, and increased by one hour on the Sunday after Ramadan at 02:00 (in 2025, the dates are 23 February and 6 April).
| 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 | ObservedDST 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 theAustralian Capital Territory,Jervis Bay Territory,New South Wales,Norfolk Island,South Australia,Tasmania, andVictoria. | |
| 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 theBengal 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 | ObservedDST in 1931–1932. |
| Bosnia and Herzegovina | Observed DST in 1916–1918 when it was part ofAustria-Hungary, in 1941–1945 and since 1983 when it was part ofYugoslavia or independent. | |
| Botswana | 1944 | Observed DST in 1943–1944. |
| Brazil | 2019 | ObservedDST 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 ofSaskatchewan, and parts ofBritish Columbia,Nunavut,Ontario andQuebec 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 (excludingEaster Island, which observed it in 1932–1946) and again, as consequence of hydropower scarcity during theGreat Drought of 1968,[9][10] from 1968 to 2015. Chile observed year-round DST in 2015, but reintroduced regular DST in 2016.Magallanes Region since December 2016 andAysén Region since March 2025 do not observe DST. | |
| China | 1991 | Observed DST in 1940–1941 (when it wasRepublic of China) and 1986–1991. |
| Colombia | 1993 | ObservedDST 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 ofAustria-Hungary, in 1941–1945 and since 1983 when it was part ofYugoslavia 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 ofAustria-Hungary, 1940–1949 and since 1979 when it was part ofCzechoslovakia or independent. | |
| Denmark | Observed DST in 1916, 1940–1948, and since 1980. | |
| Dominican Republic | 1974 | Observed DST in 1966–1967, 1969–1974. |
| Egypt | ObservedDST 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. SeeDaylight saving time in the Americas—Greenland. ThePituffik Space Base uses the DST schedule of Canada and the United States. Stations on the east coast ofNortheast Greenland National Park do not observe DST.[f] | |
| Guatemala | 2006 | ObservedDST 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 theSino-Indian War of 1962 and theIndo–Pakistani Wars of1965 and1971. |
| 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 ofYugoslavia,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 | ObservedDST 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 andTamaulipas observed DST in 1988. The whole country started observing DST in 1996, butSonora 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 ofYugoslavia,Serbia and Montenegro or independent. | |
| Morocco | 2018 | ObservedDST in 1939–1945, 1950, 1967, 1974, 1976–1978, and 2008–2018. In 2012–2018, DST was suspended during the month ofRamadan. 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 towinter time in 1994–2017 (UTC+2 standard, UTC+1 winter) in all regions exceptZambezi, which remained in UTC+2 all year.[12] |
| 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.[13] | |
| North Macedonia | Observed DST in 1941–1945 and since 1983 when it was part ofYugoslavia or independent. | |
| Northern Cyprus | Observed DST since 2017. Maintained permanent DST from September 2016 to October 2017.[14] | |
| Norway | Observed DST in 1916, 1940–1945, 1959–1965, and since 1980. Follows European Union practice, although not a member. | |
| Pakistan | 2009 | ObservedDST in 1942–1945 as a part of theBritish 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.[15] |
| Peru | 1994 | Observed DST in 1938–1940, 1986–1987, 1990, and 1994. |
| Philippines | 1978 | Observed DST in 1936–1937, 1954, and 1978. |
| 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 toWorld 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.[16] |
| 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 ofYugoslavia,Serbia and Montenegro or independent.[17] | |
| 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 toUTC+07:20.[18] |
| Slovakia | Observed DST in 1916–1918 when it was part ofAustria-Hungary, 1940–1949 and since 1979 when it was part ofCzechoslovakia or independent. | |
| Slovenia | Observed DST in 1916–1918 when it was part ofAustria-Hungary, in 1941–1945 and since 1983 when it was part ofYugoslavia 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. TheCanary Islands observed DST since 1980. | |
| Sri Lanka | 2006 | Observed DST during the World War II, from 1942 to 1945 just as the rest of theIndian 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. |
| Türkiye (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 newTurkey 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 notde facto observe DST. | |
| United Kingdom | Main article:British Summer Time Observed DST (commonly referred to as British Summer Time (BST)) since 1916. Year-roundSummer Time (BST) +Double Summer Time (BDST) 1940–1945. Two-stageDouble Summer Time (BDST) 1947. Year-roundSummer 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 theNavajo Nation) andHawaii do not observe DST.[8] Year-round DST observed in 1942–1945 and 1974–1975. | |
| Uruguay | 2015 | ObservedDST in 1923–1926, 1933–1943, 1959–1960, 1965–1970, 1972, 1974–1980, 1987–1993, and 2004–2015.[19] |
| 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. |
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".
On 8 February 2018, theEuropean Parliament voted to ask theEuropean Commission to re-evaluate DST in the European Union.[20] An online survey was performed between 4 July and 16 August 2018, in which 4.6 millionEU citizens[21] responded. The survey was especially popular inGermany, resulting in 68% of all respondents located in that country.[22] Out of all the participants, about 84% did not desire to adjust clocks twice annually.[21] Based on this poll, on 12 September 2018 theEuropean Commission decided to propose an end to seasonal clock changes (repealing Directive 2000/84/EC).[23] In order for this proposal to be valid, theEuropean Union legislative procedure must be followed, mainly that theCouncil of the European Union and the European Parliament must both approve it.
The seasonal changes were supposed to stop in 2021, but theCouncil of the European Union asked theEuropean Commission for a detailed impact assessment before countries would decide on how to proceed.[22]
Since 2018, severalU.S. states have passed laws to abolish seasonal changes and adopt permanent DST, but these laws cannot take effect without approval from thefederal government.[24] 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 proposedSunshine 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. The proposal has been introduced in every term of theUnited States Congress since 2018. In 2022, it passed theSenate withunanimous consent but expired without consideration by theHouse of Representatives.[25]
