@mattly I love working with time in computing systems, and have done a lot of in my past. (I'm the author of the Time Manager & Sound Manager of the Macintosh OS in the 80s for one...) Most of my work is w.r.t. audio, video, and media.
I would be careful to separate the concepts of the precision with which a point in time is measured and represented... as distinct from an interval of time (which really has two such "fuzzy" end points).
cont'd 1/2