A leap second will be added today at 23.59.60 UTC/GMT, which for us is 11.59.60 a.m.
“Hoorah” quoth Dave L. “Oh no, a second late for lunch” sighes Anne M.
https://en.wikipedia.org/wiki/Leap_second
or, more nerdified
http://www.iers.org/SharedDocs/News/EN/BulletinC.html
Cheers,
John
(wearing his Physics/Astronomy Liaison Librarian hat)
For a warning about what could happen if you let the extra second worry you, read Perfect by Rachel Joyce (available at CCL and reviewed here: http://www.telegraph.co.uk/…)