Carl Jolley wrote [in part]: > I find that most uses of Julian date is to allow calculation in elapsed > days or to facilitate the calculatation of the difference in days between > two dates. Date:Manip does those tasks just fine including calculation of > "business" days based on a list of holidays.
Exactly. Most people think that this is 'Julian date'. It's actually a misnomer. That's why Tom Christiansen added some of my prose to the perldocs on Julian date [it is in the 5.6 docs but not in the 5.005 docs]. I agree with you here: Date::Manip and Date::Calc do pretty much everything I need for date arithmetic. > Also, from a curiosity > standpoint what is a "real" Julian date according to David Cassell? I > always thought of it as <year><day_of_year> where <day_of_year> was three > digits (1..365 or 1..366 for a leap year) and <year> was either two digits > (if all dates were in the same century) otherwise year was four digits. Julian date is actually the calendar which was supplanted by the Gregorian calendar. The use you have above is often misnamed 'Julian date' [but isn't]. The Gregorian calendar was introduced to fix errors in the Julian calendar in 1582 by pope Gregory XIII [IIRC] and was slowly accepted around the world. It became the standard in England in 1752 [when Wednesday the 2nd of September was abruptly followed by Thursday the 14th of September]. And it's not just according to me. You can look it up, on paper or electronic version. But time and again, when people ask for Julian date, they really want something entirely different. I have seen someone doing astronomical calculations for years in the Middle Ages who really did want the Julian calendar, but he's the only one I know of. David -- David Cassell, CSC [EMAIL PROTECTED] Senior computing specialist mathematical statistician _______________________________________________ Perl-Win32-Users mailing list [EMAIL PROTECTED] http://listserv.ActiveState.com/mailman/listinfo/perl-win32-users
