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