The International Astronomical Union (IAU) Standards Of Fundamental Astronomy (SOFA) project has started to release various reference algorithms for astronomic applications. It is currently all in Fortran 77, but other languages might follow. http://www.iau-sofa.rl.ac.uk/ Included in the first base release are a couple of calendar and time scale conversion algorithms: http://www.iau-sofa.rl.ac.uk/2001_0331/Astronomy.html Markus -- Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK Email: mkuhn at acm.org, WWW: <http://www.cl.cam.ac.uk/~mgk25/>