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A calendar is a method of organizing times for social, religious, professional or administrative functions. This is carried out by providing names to periods of time, usually days, months, months, and years. A day is the designation of a single, distinct day inside this kind of a system. A calendar is also a actual physical document (typically paper) of this sort of a method. A calendar can also mean a listing of planned occasions, this sort of as a court docket calendar or a partly or totally chronological checklist of documents, these kinds of as a calendar of wills.

Intervals in a calendar (these kinds of as years and months) are generally, though not always, synchronized with the cycle of the sun or the moon. The most common sort of pre-contemporary calendar was the lunisolar calendar, a lunar calendar that sometimes adds a single intercalary thirty day period to continue being synchronised with the solar calendar year in excess of the prolonged term.

The calendar in most widespread use these days is the Gregorian calendar, released in the sixteenth century by Pope Gregory XIII as a modification of the Julian calendar, which was itself a modification of the ancient Roman calendar. The term calendar alone is taken from calendae, the term for the initial working day of the month in the Roman calendar, related to the verb calare "to phone out", referring to the "calling" of the new moon when it was very first observed. Latin calendarium intended "account e-book, sign-up" (as accounts had been settled and debts were collected on the calends of every thirty day period). The Latin expression was adopted in Outdated French as calendier and from there in Center English as calender by the 13th century (the spelling calendar is early contemporary).

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