Coordinated Universal Time is the world's official time scale. It is coordinated in Paris. Time signals are broadcast 24 hours a day via short-wave radio and satellites. Those who want the correct time can call 303-499-7111. The exact time is announced once every minute, and every second after that.
Jim Richter, Appleton City Sealer.
For more information see What is Universal Time? from the U.S. Naval Observatory's Astronomical Applications Department.