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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 ...
This category and its subcategories contains articles about recurring events which occur annually or frequently within one specific season, for historic, religious, economic, or weather-related reasons. Note that the definition of individual seasons varies somewhat between countries and also between hemispheres.
A calendar can also mean a list of planned events, such as a court calendar, or a partly or fully chronological list of documents, such as a calendar of wills. Periods in a calendar (such as years and months) are usually, though not necessarily, synchronized with the cycle of the sun or the moon .
The association reorganised in 2005 as The World Calendar Association, International. [5] It was last active on 2013 as it had resumed efforts towards adoption of the World Calendar in 2017 and 2023. [6] The World Calendar Association's last director was Wayne Edward Richardson of Ellinwood, Kansas who died on 29 May 2020. [7]
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.
The day of the week can be easily calculated given a date's Julian day number (JD, i.e. the integer value at noon UT): Adding one to the remainder after dividing the Julian day number by seven (JD modulo 7 + 1) yields that date's ISO 8601 day of the week. For example, the Julian day number of 7 February 2025 is 2460714.
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A precise date is specified by the ISO week-numbering year in the format YYYY, a week number in the format ww prefixed by the letter 'W', and the weekday number, a digit d from 1 through 7, beginning with Monday and ending with Sunday. For example, the Gregorian date Friday, 7 February 2025 corresponds to day number 5 in the week number 06 of ...