[$] Leap-second issues, 2015 edition

The leap second is an occasional ritual wherein Coordinated Universal Time(UTC) is held back for one second to account for the slowing of the Earth'srotation. The last leap second happened on June 30, 2012; the next isscheduled for June 30 of this year. Leap seconds are thus infrequentevents. One might easily imagine that infrequent events involving timediscontinuities would be likely to expose software problems, and, sureenough, the 2012 leap second hadits share of issues. The 2015 leap second looks to be a calmer affair,but it appears that it will not be entirely problem-free.