Wow... thanks to everyone for their comments.  I thought my 'brain cramp' 
was due to fatigue, but now I know better.  Walter restated my initial 
inquiry best.  I was looking for the difference between two dates in terms 
of years, months and days; not just days.  

Tracy's code looks pretty cool, and if it compiles and works on the HP3000 
it's good enough for me.  If I use this code elsewhere and I end up losing 
a day here or there every 400 years I won't lose any sleep over it.  

And Tracy, for work like this I see it as $200/hr like this:
$10/hr to code it
$190/hr to explain it

But really if you read thru sites like 
http://scienceworld.wolfram.com/astronomy/GregorianCalendar.html you'll 
see that you pretty much need a graduate degree in astronomy or astrology 
or some such to truly understand the origin of our calendar system.  So 
maybe $200/hr is a lowball figure.

Eben

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