Julian date conversion

Karl writes: > > I am currently looking for a way to change a Julian date to a Gregorian date. > If any one has a routine or ideas, I would be greatful. > > Thanks... > A Gregorian year is 365.2425 days long a Julian year is 365.25 days long. That part is easy. The rough part is when both calendars start - the Julian calendar actually started in the 40s BC while the Gregorian takes its start from the birth of Christ. I am not going to get into a discussion of when that occured... Still - the modified version of the Julian also starts in our 0 I think - so maybe it will work. (The Romans had a messed up calendar so Julius hired an Egyptian Astronomer to work out a new calendar - he told them to use 365.2425 days but I gather their calculators only went to two decimal places so they rounded it to an easy number). You may also have to worry about when the date is applicable - not all countries adopted the Gregorian calendar at the same time and I gather some still use the Julian calendar (maybe that's why you care?). I'm talking off the top of my head here and am probably out to lunch as per usual. I suggest you contact a Pieter Donche (donche@reks.uia.ac.be) who is incredibly knowledgable on this topic or look for HISTCAL (an IBM-PC program for historical chronology) which does these conversions. cheers j. _____________________________________________________________________________ Jack Parker | Hewlett Packard, BSMC Boise, Idaho, USA| jparker@hpbs3645.boi.hp.com | "A mind is a terrible thing." (208) 396-5388 (W) (208) 384-1623 (H) | _____________________________________________________________________________ Any opinions expressed herein are my own and not those of my employers. _____________________________________________________________________________