Title: Daylight saving time in Canada
Content:  In Canada, daylight saving time (DST) is observed in nine of the country's ten provinces and two of its three territories—though with exceptions in parts of several provinces and Nunavut. Under the Canadian Constitution, laws related to timekeeping are a provincial and territorial matter. Most of Saskatchewan, despite geographically being in the Mountain Time Zone, observes year-round Central Standard Time (CST). In 2020, the Yukon Territory abandoned seasonal time change to permanently observe year-round Mountain Standard Time (MST). In the regions of Canada where daylight saving time is used, it begins on the second Sunday of March at 2 a.m. and ends on the first Sunday in November at 2 a.m. As a result, daylight saving time lasts in Canada for a total of 34 weeks (238 days) every year, or about 65 percent of the entire year.
Title: Daylight saving time in Canada
Content: Ontario and Manitoba – October 20, 2005 ; Quebec – December 5, 2005 ; Prince Edward Island – December 6, 2005 ; New Brunswick – December 23, 2005 ; Alberta – February 2, 2006 ; Northwest Territories – March 4, 2006 ; British Columbia – March 31, 2006 ; Nova Scotia – April 25, 2006 ; Yukon – July 14, 2006 ; Newfoundland and Labrador – November 20, 2006, but officially announced on January 18, 2007 ; Nunavut – February 19, 2007 ; Saskatchewan – No official action was taken as almost all of the province does not observe daylight saving time and remains on CST year-round. However, the few places in the province that do observe daylight saving (Lloydminster and the surrounding area, which straddles the Alberta border 
Title: Daylight saving time in Canada
Content:  Canada until 1949. In practice, since the late 1960s, DST across Canada has been closely or completely synchronized with its observance in the United States to facilitate consistent economic and social interaction. When daylight time became standardized across the US in 1966 when Congress passed the Uniform Time Act, Canada soon followed. DST ended in October until 1986, when the end of the period was changed to November. When the United States extended DST in 1987 to the first Sunday in April, all DST-observing Canadian jurisdictions followed suit. The latest United States change (the Energy Policy Act of 2005), adding parts of March and November to the period during which DST is observed starting in 2007, was adopted by the various provinces and territories on the following dates:
Title: Time in Canada
Content:  the world to introduce it, on July 1, 1908. Daylight saving time is currently observed in nine of ten provinces and two of three territories, but with exceptions in several provinces and Nunavut. Most of the province of Saskatchewan, despite geographically being in the Mountain Time Zone, observes year-round CST. In 2020, the territory of Yukon abandoned seasonal time change and moved to permanently observing MST year-round. Under the Constitution of Canada, laws related to timekeeping are a purely provincial matter. In practice, since the late 1960s DST across Canada has been closely or completely synchronized with its observance in the United States to 
Title: 2020 in Canada
Content: November 1 Daylight saving time ends ; November 24/25 – Prince Edward Island and Newfoundland and Labrador will temporarily leave the Atlantic Bubble, due the latest wave in the pandemic. 
Title: Time in Canada
Content:  year-round. However, the few places in the province that do observe daylight saving (Lloydminster and the surrounding area, which straddles the Alberta border and observes Alberta's Mountain Time – and Creighton, which observes daylight saving on an unofficial basis due to its proximity to the border with Manitoba) follow the aforementioned March–November schedule just like the other provinces and territories. Four Canadian cities, by local ordinance, used daylight saving time in 1916. Brandon, Manitoba, adopted it on April 17. It was followed by Winnipeg on April 23, Halifax on April 30, and Hamilton, Ontario, on June 4. Port Arthur, Ontario, was the first place 
Title: Daylight saving time in Canada
Content:  Time in Manitoba, all of which runs on Central Time, is dictated by the province's Official Time Act. In 1916, Brandon and Winnipeg became two of seven cities in Canada to use daylight saving time before 1918, by local ordinance. On October 20, 2005, Manitoba added parts of March and November to its daylight saving period, following the United States' Energy Policy Act of 2005.
Title: Daylight saving time in Canada
Content:  observes Mountain Time; and Creighton, which observes daylight saving on an unofficial basis due to its proximity to the border with Manitoba) follow the aforementioned March–November schedule just like the rest of the country. Port Arthur, Ontario (now part of Thunder Bay), was the first municipality in the world to enact daylight saving time, on July 1, 1908. (Germany later became the first country to adopt the time change, on April 30, 1916.) Six Canadian cities, by local ordinance, subsequently used daylight saving time before 1918: Regina, Saskatchewan, on April 23, 1914; Brandon and Winnipeg, Manitoba on April 24, 1916; then Halifax, Nova Scotia; Hamilton, Ontario; and Montreal, Quebec. St. John's, Newfoundland (now Newfoundland and Labrador), also used DST before 1918, but the province itself did not become part 
Title: Time in Canada
Content:  consistent economic and social interaction. When the United States extended DST in 1987 to the first Sunday in April, all DST-observing Canadian provinces followed suit to mimic the change. In 2019, the legislature of British Columbia began the process of eliminating the practice of observing daylight saving time in the province. On October 31, 2019, the government introduced Bill 40 in the legislature, which would define "Pacific Time" as "7 hours behind Coordinated Universal Time (UTC)". In a press release, the provincial government stated an intention to maintain alignment of clock time with Washington, Oregon, California, and Yukon. The move follows a consultation earlier 
Title: 2018 in Canada
Content: November 4 – Daylight saving time ends. ; November 5 – Prince Edward Island municipal elections. 

Question: when does canada switch to daylight savings time?
Answer: the second Sunday of March.