On 2016-07-08 12:16, I wrote:
Is there a mistake in this announcement?


http://www.usno.navy.mil/USNO/tours-events/2016_Leap_Second%20Press%20Release%20-%20Final.pdf


WASHINGTON, DC -- On December 31, 2016, a “leap second” will be added to
the world’s clocks at 23 hours, 59 minutes and 59 seconds Coordinated
Universal Time (UTC).

The mistake is in the first sentence. Nothing unusual happens at 23:59:59. One second later, at 23:59:60, the leap second begins. In other words, UTC will do this:

23:59:59.9
23:59:60.0
23:59:60.1
...
23:59:60.9
00:00:00.0

I have informed the author of the press release.

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