Can anyone provide some good reads on the replaying leap second concept? Has anyone ever taken advantage of this? How do projects that rely on subsecond accurac

Can anyone provide some good reads on the replaying leap second concept? Has anyone ever taken advantage of this? How do projects that rely on subsecond accuracy and syncronization resolve the issue? edit: for anyone interested, there has never been a negative leap second (it's always been something like 23:59:59, 23:59:60, 00:00:00). see http://en.wikipedia.org/wiki/Network_Time_Protocol#Security_concerns http://en.wikipedia.org/wiki/Network_Time_Protocol#Security_... edit2: however, there are negative leap seconds in UNIX time. I wonder if there's a vulernability here? see http://en.wikipedia.org/wiki/Unix_time#Leap_seconds http://en.wikipedia.org/wiki/Unix_time#Leap_seconds