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  2. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.

  3. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Perpetual Calendar Gregorian Calendar adoption dates for many countries. World records for mentally calculating the day of the week in the Gregorian Calendar ; The Calendar FAQ – Frequently Asked Questions about Calendars; Today's date (Gregorian) in over 800 more-or-less obscure foreign languages Archived 8 March 2023 at the Wayback Machine

  5. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [ 1 ] [ 2 ] drawing inspiration from Lewis Carroll 's perpetual calendar algorithm .

  6. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.

  7. AOL Calendar

    help.aol.com/products/aol-calendar

    Calendar · Oct 28, 2023 Create, share, or subscribe to a calendar Learn how to stay in touch with the people in your life by creating, sharing, or subscribing to a calendar.

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