By The Associated Press, July 7, 2016
Extra second will be added after Dec. 31, 11:59 p.m. and 59 seconds UT (6:59 p.m. ET)
Already a leap year, 2016 will drag on a bit longer. International timekeepers are adding a leap second at year’s end.
Because Earth is slowing down a tad, occasionally timekeepers insert another second or two to match Earth’s rotation and the precise atomic clocks.
