4 hours and
since the nominal start of our time system.
(If you are that way inclined, four seconds earlier you could write the time as
1815/12/09 06:03:00 is a better arithmetic progression date;
A quick search fails to find any memorable happenings that day, although Lady Ada Lovelace (Byron's daughter and the first computer programmer) was born the following day.
This entry was originally posted at http://bens-dad.dreamwidth.org/29772.htm