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Calendrical Calculations

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This title has free online support material available.



  • 20 tables
  • Page extent: 512 pages
  • Size: 234 x 156 mm
  • Weight: 0.68 kg


 (ISBN-13: 9780521702386)

  • There was also a Hardback of this title but it is no longer available | Adobe eBook
  • Published December 2007

Replaced by 9781107683167

$47.99 (P)

A valuable resource for working programmers, as well as a fount of useful algorithmic tools for computer scientists, this new edition of the popular calendars book expands the treatment of the previous edition to new calendar variants: generic cyclical calendars and astronomical lunar calendars as well as the Korean, Vietnamese, Aztec, and Tibetan calendars. The authors frame the calendars of the world in a completely algorithmic form, allowing easy conversion among these calendars and the determination of secular and religious holidays. LISP code for all the algorithms are available on the Web.


1. Introduction; Part I. Arithmetical Calendars: 2. The Gregorian calendar; 3. The Julian calendar; 4. The Coptic and Ethiopic calendars; 5. The ISO calendar; 6. The Islamic calendar; 7. The Hebrew calendar; 8. The Ecclesiastical calendars; 9. The Old Hindu calendars; 10. The Mayan calendar; 11. The Balinese Pawukon calendar; 12. Generic cyclical calendars; Part II. Astronomical Calendars: 13. Time and astronomy; 14. The Persian calendar; 15. The Baha'i calendar; 16. The French Revolutionary calendar; 17. The Chinese calendar; 18. The modern Hindu calendars ; 19. The Tibetan calendar; 20. Astronomical lunar calendars coda; Part III. Appendices: A. Function, parameter, and constant types; B. Lisp implementation; C. Sample data.


"Because years, months, and days don't mesh simply, calendar making has been a challenge throughout history. Dershowitz and Reingold's compendium, here in its third edition, has already established itself as the definitive reference on calendrical structures. Their manual displays conversions between all the major calendar systems as well as between many fascinating schemes from bygone civilizations." Owen Gingerich, Harvard-Smithsonian Center for Astrophysics

"One of the most fascinating books I've read all year. Takes chronology into the computer age with impressive erudition and elan. Just finding out what the calendar rules are is usually close to impossible; Calendrical Calculations tell you how to use them too. A must for everyone who worries about days, months, years - and why they never quite fit." Ian Stewart

"A good, comprehensive documentation of software for calculating dates on very many calendars." P. Kenneth Seidlmann, Director of Astronomy, U.S. Naval Observatory

"One of those rare books that is both an authoritative reference source and a fun read." Danny Hillis

"The book is a definitive account of the world's major calendars and how to use them. It will be of interest not only to mathematicians, but also to historians and laymen. The authors are to be congratulated on a splendid research job." Martin Gardner

"This book must surely become the standard work on calendar conversions. No historian, chronologist, or recreational mathematician should be without it." E.G. Richards, Nature

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