The International Earth Rotation and Reference Systems Service is the organization that monitors the difference in the two timescales and calls for leap seconds to be inserted or removed when necessary. Since 1972, leap seconds have been added at intervals varying from six months to seven years — the most recent was inserted on Dec. 31, 2005.
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Same thing we do every night DOJ...try to take over the Internet!
Calculating and inserting leap seconds must be a very, very...very...very dry job. I can't help but imagine a bunch of crusty old bean-counters playing with clocks.
--TwoDragons
And contrary to TwoDragons' conjecture, you get to play with a lot of expensive toys.