Atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...

In the NFL, clock management is just as important as physical attributes. What are the rules for stopping the clock during a ...

WASHINGTON — Millions of clocks across the United ... Arizona and Hawaii don't observe daylight saving time. Under federal law, states are allowed to opt out of daylight saving time and remain ...

WASHINGTON — Millions of clocks across the United States will revert ... Arizona and Hawaii don't observe daylight saving time. Under federal law, states are allowed to opt out of daylight saving time ...