Eike Lange wrote:

IMHO, you should write the unit. We could perhaps improve the unit by conversions of date/time formats, used in special cases like "flight-sheduling". AFAIK do the airports calculate an hour based on 100 "Ticks?" (like swatch-thee-beep :). Maybe, there are some more date/time calculations available for some special purpose.

Here is a wonderful reference for all your calendrical calculations:

http://www.amazon.com/exec/obidos/ISBN=0521777526/theinternationscA/

One reviewer noted, however, that this is

An excellent book on the history and workings of various calendars. But don't use the source code! The licensing agreement is a trap. Use the code in GNU Emacs from the Free Software Foundation distributed under the General Public License. It does everything the authors code does (except for two obscure calendars) and it's free and always will be.

Success,

Tom Verhoeff