Back in 2002 I was fortunate enough to have an article included in Flash MX Magic. It was great fun to write as it included my two favourite subjects, Flash and Time. Technologies move very quickly but I tried to ensure it would have some longevity by including a lot of material about the history of timekeeping. The version in the book was half Flash tutorial, half popular science. A lot of the historical stuff was removed for the online tutorial, which is a bit sad as that material is probably more relevant now than the source code.