Chronos — Calendrical Calculations in Javascript

Chronos is a Javascript library that makes it easy to:

• convert dates from/to 31 different calendars
• calculate special dates/times such as holidays, astronomical events (equinoxes, solstices ...), sunrise/sunset

Chronos is an implementation in Javascript of CALENDRICA 3.0, which is the Common Lisp implementation of the functions described in the book

Nachum Dershowitz, Edward M. Reingold "Calendrical Calculations"
            Cambridge University Press; 3rd edition (December 10, 2007)
            Paperback; ISBN-13: 9780521702386
            E. M. Reingold and N. Dershowitz,
            3rd ed., Cambridge University Press, 2008.
          

Some of the algorithms are from:

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

STATUS

not even beta but porting from PyCalCal which is instead pretty well tested and usable.

Acknowledgements

I want to thank:

• Prof.s Reingold and Dershowitz for their prompt replies to my (sometimes silly, other times pertinent) questions
• my family, Gilda and the kids...it takes a lot of time to sort things out even when I am together with you
• my parents and parents-in-law for their past and continuous support

Notes

CALENDRICAL 3.0 is written and copyrighted by E. M. Reingold and N. Dershowitz.

Resources

Prof. Reingold mantains a companion site for the book.

The resource page of the book at Cambridge University Press provides a link to a zipped version of 'calendrica-3.0.cl'.