Actually, the Calendar problem can be solved entirely in TeX (or LaTeX).
The proof is left to the reader.
-dh
--
"Odi et amo, quare id faciam, fortasse requiris?
nescio, sed fieri sentio et excrucior" -Catullus
D.A. Hosek. UUCP: uunet!jarthur!dhosek
Internet: dhosek at hmcvax.claremont.edu