Overview
- UK clocks go back one hour to Greenwich Mean Time at 2 a.m. on Sunday, October 26, 2025, officially ending British Summer Time.
- Daylight saving time ends in the U.S. at 2 a.m. on Sunday, November 2, 2025, the second-earliest possible date for the fall change, with Hawaii and most of Arizona not observing the switch.
- Most phones, computers and other internet-connected devices will update automatically, but analog clocks, car dashboards and some appliances may need to be reset by hand.
- Sleep-medicine specialists and a Stanford Medicine modeling study conclude permanent standard time best supports circadian health, and that switching clocks twice a year is the least beneficial option.
- The seasonal shifts trace to early proposals and wartime adoption in the early 1900s, and quirks endure such as Edinburgh’s Balmoral Hotel clock remaining three minutes fast even after the change.