While DST was observed in some areas, the tradition became official in the U.S. when the Uniform Time Act of 1966 was passed.

Wondering if the clocks change this year? Here's when and what to know about daylight saving time 2026 start and end.

Add Yahoo as a preferred source to see more of our stories on Google. Setting the time on a watch. (Getty Images) Daylight saving time begins tonight. At 2 a.m. local time Sunday, clocks across most ...

First dreamed up decades ago, the world's first nuclear clocks are set to improve quickly, becoming more precise and aiding the hunt for dark matter.

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