Overview
- Clocks advanced one hour at 2 a.m. Sunday, March 8, putting most of the U.S. on daylight saving time until Nov. 1, with Hawaii, most of Arizona and several U.S. territories exempt.
- Doctors and researchers cite short-term increases in heart attacks, strokes and traffic crashes after the spring switch, urging good sleep hygiene and morning light exposure.
- A Stanford study published in 2025 linked biannual clock changes to higher rates of strokes and obesity, estimating about 300,000 fewer strokes and over 2 million fewer obesity cases under permanent standard time.
- British Columbia says this weekend’s shift will be its last as the province moves to permanent daylight time, a change Premier David Eby says is backed by broad public support.
- In Washington, time-policy changes remain unsettled, including the new Daylight Act of 2026 proposing a permanent 30‑minute shift, while earlier Sunshine Protection Act efforts stalled in Congress.