On Mon, Jul 2, 2012 at 11:24 AM, Peter Eckel <lists at eckel-edv.de> wrote: > On the other hand I'm a bit surprised that the problems were comparably few - actually there is a time '01:59:60' for one second, and any plausibility check I've ever seen assumes that minutes and seconds are in the range from 0..59. Wrongly, it seems. > > Apparently Google uses an approach that looks much less risky to me - they use a time window over which they 'smear' the leap second by making their time servers lie about the time for a while, making it pass a little bit slower. That way they avoid the unlucky 61st second and still advance the clocks within a reasonable time. > > <http://googleblog.blogspot.de/2011/09/time-technology-and-leaping-seconds.html> > Interesting, but I thought that ntp clients always advanced the clock by small fractions of a second anyway even when the master source differs by more. -- Les Mikesell lesmikesell at gmail.com