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Wikipedia about perpetual calendar

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General information

For the Gregorian calendar, a perpetual calendar often consists of 14 one-year calendars, plus a table to show which one-year calendar is to be used for any given year. Note that such a perpetual calendar fails to indicate the dates of moveable feasts such as Easter.

The Perpetual Calendar has 14 one-year calendars, one for each common year (year that does not have a February 29) that starts on each day of the week, and one for each leap year that starts on each day of the week.

Also certain calendar reforms may be considered to be perpetual calendars, such as The World Calendar, International Fixed Calendar and Pax Calendar. These calendars have each year and each month within the year, always beginning on the same day of week.

The term perpetual calendar is also used in watchmaking to describe a calendar mechanism in a watch that displays the date correctly 'perpetually', taking into account the different lengths of the months as well as leap year's day.

Perpetual calendar formula

Following is a formula for calculating the day of the week given the date.

The formula uses the fact that each year begins one day later than the previous except for leap years. The days in a leap year are 2 days later except for January and February where it is one day later. Since the year values increase by one we can create a sequence by adding the year to the year divided by 4 dropping the fraction. This sequence increases by 1 every year except every 4 years where it increases by 2. This sequence will work for the years 1901 through 2099 only since 1900 and 2100 are not leap years.

A table is needed to get the relative day of week of the first of each month relative to the first day of a year.

Now for the formula (example for 2006-02-15).

Add the following: The 4 digit year (2006). The integer portion of the year divided by 4 (501). The relative month code (3). The day of the month (15). If it is a leap year and January or February then subtract 1 (0). Adjust the relative week day by subtracting 2 (2525-2). Divide by 7 keeping the remainder (3).

Use this number to find the day as follows:
0-Sunday 1-Monday 2-Tuesday 3-Wednesday 4-Thursday 5-Friday 6-Saturday

See also

  • Calculating the day of the week
  • Doomsday (weekday)
  • Perpetual Calendar of 800 Years

External links

Search results for Perpetual Calendar

Java Perpetual Calendar

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The Arts Calendar of Events

Midland Reporter-TelegramTHE ARTS CALENDAR OF EVENTS A project of Arts Assembly of Midland P.O. Box 3494, Midland, Texas 79702 687-1149 FAX 687-1600 SUNDAY Arts Assembly of Midland: Midland's non-profit arts council and umbrella organization for performing and visual arts organizations, 401 W. Texas Ave., Suite 508, 687-1149. EXHIBIT: Art in the Park, four selected sculptures, Duet by David Hickman, Gypsy Rose by Ben ...http://www.mywesttexas.com/articles/2008/09/05/entertainment...

Calendar committee runs into familiar resentments and state law constraints

The Beaufort GazetteA Beaufort County School District committee charged with recommending one, universal calendar for all county schoolsseemed to realize it was bumping into a classic debate Thursday.http://www.beaufortgazette.com/local/story/546106.html

Community Calendar for Sept. 3

Warrenton JournalNeed an item in the community calendar? Submit calendar items by noon the Wednesday before the intended publication date. To be included in this free listing of community events, send notices to: Warrenton Journal, 220 E. Main St.; fax to 636-456-3020; or e-mail to jscott@yourjournal.com. Notices must include the date, time and location (including street address) of the event, a contact name ...http://warrentonjournal.stltoday.com/articles/2008/09/05/new...

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Merry Columbus Hashanah

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Miracles of the Rosary

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Wyoming coach aware of Ute dominance

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Overheard, out and about, Mrs. Grundy sees all, tells all

Andalusia Star NewsGentle reader, please put on your calendar January 29 – February l for the Florida Chautauqua Center weekend in DeFuniak ... Kibler quoted two sentences I liked, ‘The task of the civilized intelligence is perpetual salvage’ and ‘If in making ... http://www.andalusiastarnews.com/news/2008/oct/03/overheard-...

Search results for Perpetual Calendar

Java Perpetual Calendar

Getting Started with Java J ava is a programming language used to deliver executable content, that is, a program, through a web page. The Java object code resides on the server ... http://my.execpc.com/~mikeber/calendar.html

Create calendar for any year

This calendar creator makes a calendar with holidays for many countries for any year or month.http://www.timeanddate.com/calendar/generate.html

Toke Nørby. The Perpetual Calendar

A Helpful Tool to Postal Historians. Here you have a Perpetual Calendar which allow you to find the weekday for any date (both Julian and Gregorian dates). Whether your country ... http://www.norbyhus.dk/calendar.html

perpetual calendar : Product Search Results : Timex.com

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Perpetual Jewish/Civil Calendar--Inquiry

At the prompt enter at least one, and not more than five years, putting a plus sign + in front of civil common era years, and a space between the years.http://www.uwm.edu/cgi-bin/corre/calendar
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