Sunday is the semi-annual changing of the clocks when most of the country will "fall back" to standard time after nearly ...

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 come at 2 a.m., when clocks will “fall back” to 1 a.m ...

To determine the official time, the NRC uses atomic clocks, which are instruments that use microwave signals and atoms to provide the most accurate time known in the world. The NRC has a minimum ...