Daylight saving time became a national standard in 1966 when President Lyndon B. Johnson signed the Uniform Time Act, which ...

How do we know the time... precisely? The question is more complex than it first appears, says Richard Fisher.

How do we know the time... precisely? The question is more complex than it first appears, says Richard Fisher.

The days have started getting shorter in what’s a sure indication the end of summer is near. We’ve seen other signs, too – ...

The days will start to feel that bit longer from today after the clocks changed overnight. In the early hours of the morning clocks moved forward by one hour, which means we've said goodbye to ...

Satellite navigation systems for lunar settlements will require local atomic clocks. Researchers are figuring out what time they will keep.

Atomic scientists reset the Doomsday Clock on Tuesday, moving its hands to 90 seconds to midnight - closer than ever before to the threat of annihilation.

Even guardians of America's atomic clocks say time doesn't work the way we think it does.