The International Earth Rotation and Reference Systems Service is the body responsible for maintaining global time and reference frame standards, notably through its Earth Orientation Parameter (EOP) and International Celestial Reference System (ICRS) groups.
Among its other functions, the IERS is responsible for announcing leap seconds.
The Sub-bureau for Rapid Service and Predictions of Earth Orientation Parameters of the IERS, located at the United States Naval Observatory, monitors the Earth's rotation. Part of its mission involves the determination of a time scale based on the current rate of the rotation of the Earth. Other services of IERS are at the Paris Observatory.
UT1 is the non-uniform time based on the Earth's rotation.
Wait just a second.(December 31, 2005 will contain one second more according to International Earth Rotation and Reference Systems Service)(Brief article)
Sep 01, 2005; The International Earth Rotation and Reference Systems Service announced that December 31, 2005, will contain an extra second....