'Leap second' around world (13)

Photo taken on 235960 GMT on June 30, 2015 shows the clock on the ancient Post Office building in Washington, the United States of America. Timekeepers on Tuesday tacked a second to the clock to compensate for a slightly slower Earth rotation. The leap second means the clock will move from 23:59:59 to 23:59:60 before it hits midnight of universal time. (Xinhua/Yin Bogu)