While all the links on this page should lead to active web sites (dead links were removed 2003-08-23), no updates have been made in over a year. Since then, several people have sent me links, but I have yet to add them.
It pleases me that they think this page is a good list of links. I created it long before the advent of google, which is where you should go if you don't find what you're looking for here.
While I am interested in calendars, I'm not a calendar expert. The good folks on CALNDR-L (see link below) are, and if they want me to, I will gladly accept new links from them. Otherwise, I will not add any more myself.
Links last checked: 2003-08-23
The Calendar Zone -- "the" calendar site; highly recommended.
Home Page for Calendar Reform by Rick McCarty, including
CALNDR-L discussion list.
The Calendar FAQ by Claus Tøndering. Now available both as a set of HTML web pages and as an Adobe Acrobat (PDF) file.
Toke Nørby's The Perpetual Calendar -- calendar history, Gregorian, French, Danish, Russian.
Calendar by Eric Weisstein, University of Virginia -- calendar history, world calendars, links.
The Calendar by Roland Seidel -- history, different calendar systems, more.
Calendopaedia - The Encyclopaedia of Calendars by Michael Astbury -- includes Julian, Gregorian, and comparison of many different calendars.
Justin White's CalendarHome.com -- gaudy, but it's got everything.
Calendars reprinted from the Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann, editor -- includes rules and history for Gregorian, Hebrew, Islamic, Indian, Chinese, and Julian calendars.
Rice University's Gregorian Calendar -- historical background.
A Summary of the International Standard Date and Time Notation by Markus Kuhn -- International Standard ISO 8601.
The Seven-Day Week by Edward Stephan -- names for the seven days in dozens of languages.
Yahoo: Reference: Calendars -- Yahoo links!
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Most of these sites have calendar programs that do calendar conversions or prepare calendars which you can save or print.
Conversion of Julian Date to Calendar Date and vice versa [Java] by Thomas Bak -- gives Julian Day number.
Justin White's 10,000 Year Calendar [server] -- displays month or year calendar (including US holidays).
Calendar Generator [server] by HyperInfo Canada Inc -- displays a month calendar in English or French.
calendar by Victor Knight -- downloadable DOS program to generate a calendar.
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Doomsday Algorithm for Day of Week -- my explanation of John Horton Conway's Doomsday algorithm for the day of the week for any date (and you can do it in your head).
Lewis Carroll's Algorithm for finding the day of the week for any given date.
Date Algorithms By Peter Baum -- lots o' math.
Eric Weisstein's Julian Date algorithms.
Peter Meyer's Julian Day Numbers.
Calculation of the Ecclesiastical Calendar by Marcos J. Montes -- based on Butcher's algorithm for Easter, includes history and links to other resources.
Lance Latham's Standard C Date/Time Library, "collection of functions, written in the C language, related to date and time applications and designed to work as an integrated whole." Published in book form. Read Chapter 1 at this site.
The Computation of the day of the week by Mark Dettinger -- an algorithm based on Month Codes 144 025 036 146.
Mike Keith's How about a date? -- "the simplest possible formula... with no recourse to tables of 'magic numbers,' that correctly calculates the day of the week."
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Today's Calendar and Clock Page by Will Linden -- today's date in dozens of calendar systems, plus hundreds of links.
The Worldwide Holiday and Festival Site by Brian Prescott-Decie -- holidays in countries galore.
Christian Science Monitor's It's About Time.
Calendar Trivia by Drew Lawson -- including Friday the 13th, calendar systems, and background on the Revised Julian calendar, which removes 7 leap years for each 900 years.
Think the Millennium starts on January 1, 2000? Actually, 2000 is just the last year of the second Millennium. See Douglas Adams' Significant Events of the Millennium.
calendarexpress.com -- "Hundreds of calendars visually displayed for secure online purchase at discounted prices!" Okay, it's a very commercial site, but people sometimes ask me where to buy an actual calendar, so this would be one place to look...
2004 Calendars -- "Find the perfect 2004 calendar for yourself or a gift." ... and this would be another.
The Spiral Calendar by Calendar Research, Inc. -- "Did you know that on the lunar calendar, the stock market crashes of 1987 and 1929 occurred on the exact, same date? That discovery led to a methodology for identifying time periods where irrational and emotional behavior may occur."
DEC Answers Leap Year Complaint -- I love this one! Apparently someone complained to Digital Equipment Corporation back in 1983 that the year 2000 should not be a leap year. Read Digital's restrained reply. (When the only URL I had for this page gave me a 404 "not found" error, I checked my cache, and yes! it was still there! So now it's posted on my site. Should DEC -- or Compaq, or HP, or whoever they are now -- have a problem with this, please contact me.)
Let Me Count the Days, an essay by Isaac Asimov in his 266th(!) book Counting the Eons, 1983, Mercury Press, ISBN 0-385-17976-6 (pp.50-61) (from The Magazine of Fantasy and Science Fiction, October 1981) -- a fascinating and entertaining article which provides background on Joseph Justus Scaliger and the origin of the Julian period and Julian day.
In Ed Seiler's "big list" of major editions of all of Asimov's published books, Counting The Eons is also listed as published by Avon/Discus, softcover, 1984, ISBN 0-380-67090-9.
The Seven Day Circle; The History and Meaning of the Week, by Eviatar Zerubavel, 1985, The Free Press, New York, ISBN 0-02-934680-0.
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