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<H1>Doomsday rule</H1>
<P>
(algorithm)

<P>
<strong>Definition:</strong>
An algorithm to find the day of the week for any date.  It is simple enough to memorize and do mentally.
<P><em>Note:
Invented by John Horton Conway, the mathematician who also invented the computer Game of Life, sometime before January 1976.</em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>
<H2>Implementation</H2>
<A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.math.mtu.edu/%7Eswgraham/Pub/Doomsday/Doomsday.ma  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.math.mtu.edu/%7Eswgraham/Pub/Doomsday/Doomsday.ma'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.math.mtu.edu/%7Eswgraham/Pub/Doomsday/Doomsday.ma">(Mathematica)</A>
<H2>More information</H2>
<A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.math.mtu.edu/%7Eswgraham/Pub/Doomsday/DoomsdayIntro.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.math.mtu.edu/%7Eswgraham/Pub/Doomsday/DoomsdayIntro.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.math.mtu.edu/%7Eswgraham/Pub/Doomsday/DoomsdayIntro.html">intro with lots of exercises</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.interlog.com/%7Er937/doomsday.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.interlog.com/%7Er937/doomsday.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.interlog.com/%7Er937/doomsday.html">Explanation, examples, origin, and links</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cs.mun.ca/%7Ecgreene/html/mathpoem.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cs.mun.ca/%7Ecgreene/html/mathpoem.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cs.mun.ca/%7Ecgreene/html/mathpoem.html">Conway's poem explaining the algorithm</A>

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<a href="javascript:if(confirm('http://hissa.nist.gov/~black/black.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://hissa.nist.gov/~black/black.html'" tppabs="http://hissa.nist.gov/~black/black.html">Paul E. Black</a>
&nbsp;(<a href="mailto:paul.black@nist.gov">paul.black@nist.gov</a>).

<p>
Entry modified Wed Sep  8 09:50:13 1999.<BR>
HTML page formatted Wed Dec 22 09:35:11 1999.

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