Like it or not, it’s time to fall back again. Most of the United States and Canada is about to switch to standard time, moving clocks back an hour Sunday morning. The official time change will ...

A new atomic clock is one of the world’s best timekeepers, researchers say — and after years of development, the “fountain”-style clock is now in use helping keep official U.S. time. Known ...

The UAE Official Time is regarded as an advanced model for time measurement. The caesium clock's frequency is based on the invariant properties of the caesium atom, making it a highly accurate ...