Daylight saving time primarily serves our desire to maximize sunlight. Setting our clocks an hour ahead gives us a bit more afternoon light, but also means the sun rises an hour earlier in the ...

The machine, called a cesium fountain clock, was in the middle of a two-week measurement run at a National Institute of Standards and Technology (NIST) research facility in Boulder, Colo., ...

If some lawmakers (and President Donald Trump) have their way, this could be the last time we change the clocks, too. Trump didn’t clarify which side of the clock he’s on, but recent pushes ...