North America to End Daylight Saving Time This Sunday
Residents across the region will set their clocks back one hour as the biannual time change takes effect.
Updated on Oct. 30, 2026 in Sleep Disorders
Live Poll
Do you support ending the biannual time change in favor of permanent Daylight Saving Time?
Daylight Saving Time concludes this weekend as clocks shift back one hour at 2 o'clock Sunday morning. The return to standard time marks the start of a four-month period before the next transition.
Why it matters
The biannual time change was originally established as a strategy to manage energy consumption during wartime. Many now view the event as a critical safety reminder to replace batteries in household smoke and carbon monoxide detectors.
The transition requires a one-hour shift at 2 o'clock in the morning, beginning a four-month stretch of standard time. This change follows the precedent set when Ontario first implemented the biannual time shift in 1918.
The players
Ontario
This Canadian province has historically been a primary driver of legislative discussions surrounding the elimination of the biannual time change.
Manitoba
This province serves as the current alignment benchmark for the northwestern region of Ontario's shift toward permanent daylight saving time.
The details
While Ontario passed the Time Amendment Act in 2020 to move toward permanent Daylight Saving Time, the change remains subject to coordination with neighboring jurisdictions including Quebec and New York state. Meanwhile, Northwestern Ontario is moving to align with Manitoba by adopting permanent central daylight saving time.
Timeline
The biannual time change was first brought into effect in Ontario in 1918.
Ontario passed the Time Amendment Act in 2020 to move toward permanent daylight saving time.
Clocks will shift back one hour at 2 o'clock this Sunday morning.
The Big Picture
The biannual clock shift follows a pattern set by Ontario's Time Amendment Act of 2020, which aimed to make daylight saving time permanent. Efforts to transition are currently constrained by the need for regional synchronization with neighboring states and provinces.
The one-hour shift can disrupt personal sleep patterns and internal circadian rhythms for several days following the transition. It is also a recommended time to test home safety devices by replacing batteries in smoke and carbon monoxide detectors.
The takeaway
Adjusting your sleep schedule by 15 minutes each night leading up to the shift can help your body adapt more smoothly to the change. Always use this weekend as an opportunity to perform routine maintenance on your home safety equipment.
Further reading
Learn more about the physiological impacts of seasonal time transitions in our section on Sleep Disorders.
Live Poll
Do you support ending the biannual time change in favor of permanent Daylight Saving Time?
