Do Atomic Alarm Clocks really work well or is that false?

Yes it is true.Do Atomic Alarm Clocks really work well or is that false?
they are accurate to one-millionth of a second to every one-thousand yearsDo Atomic Alarm Clocks really work well or is that false?
Its amazing, atomic clocks are only accurate to a millionth of a second a year. A clock that stops running is more accurate then that. They are perfectly accurate, twice per day.