This project makes available a library of python functions for converting dates from one calendar to another or for calculating special dates (i.e. holidays, astronomical events such as equinoxes, solstices...). It is very much inspired by the body of knowledge and Common Lisp software, Calendrica 3.0, described in

Nachum Dershowitz, Edward M. Reingold "Calendrical Calculations"
Cambridge University Press; 3rd edition (December 10, 2007);
Paperback; ISBN-13: 9780521702386

Try it on line

A minimalistic (and for now not at all elegant) app: http://calendrica.appspot.com

Acknowledgements

I want to thank

• Prof.s Reingold and Dershowitz for their prompt replies to my questions (sometimes silly, other times pertinent questions)
• my family, Gilda and the kids, for the good they bring to my life
• my parents and parents-in-law for their past and continuous support

References

Nachum Dershowitz, Edward M. Reingold "Calendrical Calculations"
Cambridge University Press; 3rd edition (December 10, 2007);
Paperback; ISBN-13: 9780521702386

Jean Meeus "Astronomical Algorithms"
Willmann-Bell, Inc.; 2nd edition (1998 with corrections as of June 15, 2005);
ISBN: 0-943396-61-1

Possible sources of inspiration

See To Do list.