Published at LXer:
Tonight, at 23:59:59 on June 30, a leap second will be added to Coordinated Universal Time (UTC). Instead of the clock rolling around to 00:00:00 on July 1 as per usual, the time will actually jump to 23:59:60 before finally ending up in July a second later. The previous leap second, which was inserted in June 2012, caused a number of high-profile technological issues, and it's likely that the leap tonight will cause some problems as well.
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