This article is from the Calendars FAQ, by Claus Tondering email@example.com with numerous contributions by others.
This is the calendar FAQ. Its purpose is to give an overview
of the Christian, Hebrew, Persian, and Islamic calendars in
common use. It will provide a historical background for the
Christian calendar, plus an overview of the French
Revolutionary calendar, the Maya calendar, and the Chinese
Comments are very welcome. My e-mail address is given above.
I would like to thank
- Dr Monzur Ahmed of the University of Birmingham, UK,
- Michael J Appel,
- Jay Ball,
- Tom Box,
- Chris Carrier,
- Simon Cassidy,
- Claus Dobesch,
- Leofranc Holford-Strevens,
- David B. Kelley of the Hamamatsu University School of
Medicine in Japan,
- H. Koenig,
- Graham Lewis,
- Duncan MacGregor,
- Marcos Montes,
- James E. Morrison,
- Waleed A. Muhanna of the Fisher College of Business,
Columbus, Ohio, USA,
- Stefan Potthast,
- Yves Sagnier of the Centre d'Etudes de la Navigation
- Paul Schlyter of the Swedish Amateur Astronomer's Society,
- Dr John Stockton
for their help with this document.
Writing dates and years
Dates will be written in the British format (1 January)
rather than the American format (January 1). Dates will
occasionally be abbreviated: "1 Jan" rather than "1 January".
Years before and after the "official" birth year of Christ
will be written "45 BC" or "AD 1997", respectively. I prefer
this notation over the secular "45 BCE" and "1997 CE"
(See also section 2.13.4.)
The 'mod' operator
Throughout this document the operator 'mod' will be used to
signify the modulo or remainder operator. For example,
17 mod 7=3 because the result of the division 17/7 is 2 with a
remainder of 3.
The text in square brackets
Square brackets [like this] identify information that I am
unsure about and about which I would like more
information. Please write me at firstname.lastname@example.org.