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  2. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  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 ...

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  5. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.

  6. Category:1900 by month - Wikipedia

    en.wikipedia.org/wiki/Category:1900_by_month

    This page was last edited on 22 January 2025, at 07:45 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  7. Time formatting and storage bugs - Wikipedia

    en.wikipedia.org/wiki/Time_formatting_and...

    The term year 2000 problem, or simply Y2K, refers to potential computer errors related to the formatting and storage of calendar data for dates in and after the year 2000. Many programs represented four-digit years with only the final two digits, making the year 2000 indistinguishable from 1900.

  8. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    Within these tables, January 1 is always the first day of the year. The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering.

  9. JOB Collection - Wikipedia

    en.wikipedia.org/wiki/JOB_Collection

    1898 Hernández calendar. This was the painter's only contribution as a JOB woman. Hernández often painted portraits of young women, such as this one, pensive or dreamy and very much in tune with the times. 1899 Asti calendar. This calendar featured a woman with long hair and a flower, in the style and with this attribute of the Art Nouveau woman.