There's some great stuff about Unix time on this page: The Future of Leap Seconds http://www.ucolick.org/~sla/leapsecs/onlinebib.html http://www.ucolick.org/~s

There's some great stuff about Unix time on this page: The Future of Leap Seconds http://www.ucolick.org/~sla/leapsecs/onlinebib.html http://www.ucolick.org/~sla/leapsecs/onlinebib.html See especially the 'Distinguishing the two different meanings for time' section. It makes a good distinction between time-of-day and time interval. Unix time measures the first.