Definition: An algorithm to find the day of the week for any date.
See also Doomsday rule.
Wikipedia entry for Zeller's congruence. A summary of the International Standard Date and Time Notation ISO 8601. Links to the full ISO 8601:2004 standard (or use this link then click ISO Standard 8601 if the above gets page not found).
Christian Zeller, Kalender-Formeln, Acta Mathematica, 9:131-6, Nov 1886.
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Entry modified 3 December 2012.
HTML page formatted Mon Feb 2 13:10:40 2015.
Cite this as:
Paul E. Black, "Zeller's congruence", in Dictionary of Algorithms and Data Structures [online], Vreda Pieterse and Paul E. Black, eds. 3 December 2012. (accessed TODAY) Available from: http://www.nist.gov/dads/HTML/zellersCongruence.html