Photo taken on 235960 GMT on June 30, 2015 shows the clock of a smartphone (middle) and two photos in Moscow, Russia. International 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/Dai Tianfang)
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