Calendar date  

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
almanac, block-calendar

A date in a calendar 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, "19 August 2019" is ten days after "9 August 2019" in the Gregorian calendar. The date of a particular event depends on the time zone in which it is observed. For example the attack on Pearl Harbor took place on December 7, 1941, in Hawaii, but on December 8 according to Japanese time.

A particular day may be represented by a different date in another calendar as in the Gregorian calendar and the Julian calendar, which have been used simultaneously in different places. In most calendar systems, the date consists of three parts: the day of month, month, and the year. There may also be additional parts, such as the day of week. Years are usually counted from a particular starting point, usually called the epoch, with era referring to the particular period of time (Note the different use of the terms in geology).

The most widely used epoch is a conventional birthdate of Jesus (which was established by Dionysius Exiguus in the sixth century). A date without the year part may also be referred to as a date or calendar date (such as "23 August" rather than "23 August 2019"). As such, it defines the day of an annual event, such as a birthday or Christmas on 25 December.

Unless indicated otherwise, the text in this article is either based on Wikipedia article "Calendar date" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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