The Future of Time: UTC and the Leap Second

[...] starting in 1972, radio signals began broadcasting atomic seconds. [...] leap seconds have occasionally been added to that stream of atomic seconds to keep the signals synchronized with the actual rotation of Earth. [...] a review, update and republication of documents and standards discussing timekeeping and UTC would be necessary. Because the difference between apparent time of day and clock time would grow without leap seconds, a longer-duration adjustment would be necessary in the future.