In article <p06240801c60847976...@[192.168.1.11]> you wrote: > At 18:32 +0000 on 04/12/2009, john gilmore wrote about Re: "New" TOD:
> >In particular, as I noted on another occasion, calendrical arihmetic > >is rendered trivial when dates are stored as the signed number of > >elapsed days from some epoch origin, of which the two reasonable > >ones are: > > > >or 2) midnight 31 December 0000, which is the epoch origin of the > >Gregorian calendar, > The Gregorian Calendar did not start sometime from 1582 (for the > Roman Church) to 1752 (the UK and the US [American Colonies at that > point]) through 1926 (Turkey) so you have to state what country you > are talking about. The skipping of anywhere from 10 to 13 days in the > switch from the Julian Calendar also screws up dates (for example > Washington's Birthday is NOT celebrated on his actual birthday since > he was born on a Julian (OS/Old Style) date/year. The switchover to Gregorian is only needed when trying to figure out some historical event. Both Julian and Gregorian Calendars come in "proleptic" versions though which just roll both directions in time forever. -- Don Poitras - SAS Development - SAS Institute Inc. - SAS Campus Drive sas...@sas.com (919) 531-5637 Cary, NC 27513 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
