Indian Calendar implementation in Perl by M. Yano and M.Fushimi
Michio Yano's homepage - http://www.cc.kyoto-su.ac.jp/~yanom/
Web based implementation - http://www.cc.kyoto-su.ac.jp/~yanom/pancanga/
Command Line Interface implementation - http://www.cc.kyoto-su.ac.jp/~yanom/sanskrit/pancanga/pancanga3.13