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Reference.org
Determination of the day of the week
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<p> The determination of the day of the week for any date may be performed with a variety of <a href="/facts/Algorithm/fnl5NmRt">algorithms</a>. In addition, <a href="/facts/Perpetual_calendars/2GnnaUlM">perpetual calendars</a> require no calculation by the user, and are essentially lookup tables. A typical application is to calculate the <a href="/facts/Day_of_the_week/ENa9KgDx">day of the week</a> on which someone was born or a specific event occurred. </p>