加拿大并不是都有夏时制，甚至省内都不统一

In Canada, Saskatchewan is the only province that does not observe Daylight Saving Time (DST), staying on Central Standard Time year-round, notes CBC and CTV News. Additionally, the territory of Yukon adopted permanent Mountain Standard Time in 2020, say Wikipedia and CTV News. Wikipedia Wikipedia

Other Areas in Canada Without DST:

• British Columbia: Several regions, including the Peace River Regional District (Chetwynd, Dawson, Fort St. John), the Regional District of Fort Nelson, and parts of the East Kootenay region (Creston).
• Quebec: Certain regions east of 63° westerly longitude.
• Ontario & Nunavut: Specific, smaller regions do not adjust clocks.
• Lloydminster: Unlike the rest of Saskatchewan, this city follows Alberta's time. Wikipedia Wikipedia 

Note: In the United States, Arizona (except the Navajo Nation) does not observe DST, per University Canada West.