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Learn how to use the ISO week date system, a leap week calendar system that is part of the ISO 8601 standard. Find out how to write and read dates in the format YYYY-ww-dd, and see examples and differences with the Gregorian calendar.
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).
The Gregorian calendar is the calendar used in most parts of the world since 1582. It is a modification of the Julian calendar that corrects the drift of the equinoxes and adds a leap day every four years, except for centurial years divisible by 400.
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. Learn about the different types, uses, and algorithms of perpetual calendars, and their relation to the Gregorian and Julian calendars.
A calendar is a system of organizing days by giving names to periods of time, such as days, weeks, months and years. Learn about the etymology, history and types of calendars, from lunar and solar to lunisolar and modern.
The International Fixed Calendar is a proposed reform of the Gregorian calendar with 13 months of 28 days each. The 13th month is called Sol and inserted between June and July, and the extra day is called Year Day or Leap Day.
The Chinese calendar is a lunisolar calendar that combines the solar, lunar, and other cycles for various purposes. Learn about the history, features, variations, and influences of the Chinese calendar and its relation to the lunar month.
Learn about the calendar changes and dating systems in different countries and regions, especially in Britain and its colonies. Find out how to convert Old Style (O.S.) and New Style (N.S.) dates, and what they mean for historical events and records.
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