Time Library Organisation  Ashley Yakeley ashley at semantic.org
Wed Jan 26 03:43:04 EST 2005  This is one way the time libraries
might be organised. I think the  functionality splits cleanly
into two separate modules.  "Time" module (System.Time?
System.DateTime.Time?)    * TAI/UTC arithmetic and conversions,
leap-second tables    * possibly UT1 types and conversions,
Julian days and dates    * getting the current time  "Date"
module (System.Date? System.DateTime.Date?) importing Time
module    * time zones    * getting the locale time zone    *
converting times to "calendrical" format,     Gregorian and
possibly also Julian    * calendrical arithmetic     e.g. one
month after March 31st    * possibly "incomplete dates"     e.g.
"May 1" for all years    * parsing and showing dates and times
Left for other libraries (standard or user)    * sunrise/sunset,
moon phase, solstices & equinoxes, etc.    * figuring out time
zone from position on Earth    * civil summertime zone
adjustment calculation    * calendar