On December 31, 2008 a "leap second" will be added to the world's clocks at 23 hours, 59 minutes and 59 seconds Coordinated Universal Time (UTC). This corresponds to 6:59:59 pm Eastern Standard Time, when the extra second will be inserted at the U.S. Naval Observatory's Master Clock Facility in Washington, DC. This marks the 24th leap second to be added to UTC, a uniform time-scale kept by atomic clocks around the world, since 1972.
