We tested seven of the best sunrise alarm clocks to see how they compared with wake-up effectiveness, ease of use and overall design. Three emerged as the best.

Americans will set their clocks back Sunday morning as daylight saving time comes to an end—even as a national debate gains steam over whether the longstanding tradition of switching between ...

The best clocks now lose only a second every 300 million years – and those tiny time-keeping differences are changing our world. David Robson reports.

Atomic clocks’ accuracy and stability have already given scientists important tools for studying earthquakes, gravitational fields and space-time. These fields could experience “a major boost ...

The clocks, a convenience long enjoyed by users of mass transit in London, Paris and Washington, are starting to trickle into New York City’s labyrinthine transportation network.