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doomsday.html
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<html>
<head>
<title>
DOOMSDAY - Day of Week for Given Date
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
DOOMSDAY <br> Day of Week for Given Date
</h1>
<hr>
<p>
<b>DOOMSDAY</b>
is a C++ library which
is given the year, month and day of a date, and uses
John Conway's doomsday algorithm to determine
the corresponding day of the week.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this
web page are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>DOOMSDAY</b> is available in
<a href = "../../c_src/doomsday/doomsday.html">a C version</a> and
<a href = "../../cpp_src/doomsday/doomsday.html">a C++ version</a> and
<a href = "../../f77_src/doomsday/doomsday.html">a FORTRAN77 version</a> and
<a href = "../../f_src/doomsday/doomsday.html">a FORTRAN90 version</a> and
<a href = "../../m_src/doomsday/doomsday.html">a MATLAB version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/calendar_nyt/calendar_nyt.html">
CALENDAR_NYT</a>,
a FORTRAN90 library which
shows the correspondence between dates and the New York Times volume and
issue number;
</p>
<p>
<a href = "../../cpp_src/calendar_rd/calendar_rd.html">
CALENDAR_RD</a>,
a C++ program which
computes the representation of a given date in a
number of calendrical systems,
by Edward Reingold and Nachum Dershowitz
</p>
<p>
<a href = "../../cpp_src/calpak/calpak.html">
CALPAK</a>,
a C++ library which
makes various calendar calculations;
</p>
<p>
<a href = "../../datasets/dates/dates.html">
DATES</a>,
a dataset directory which
contains lists of dates in various calendar systems.
</p>
<p>
<a href = "../../cpp_src/weekday/weekday.html">
WEEKDAY</a>,
a C++ library which
determines the day of the week for a given day.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Lewis Carroll (Charles Dodgson),<br>
To Find the Day of the Week for Any Given Date,<br>
Nature, 31 March 1887.
</li>
<li>
John Conway,<br>
Tomorrow is the Day After Doomsday,<br>
Eureka,<br>
Volume 36, October 1973, pages 28-31.
</li>
<li>
Gary Meisters,<br>
Lewis Carroll's Day-of-the-Week Algorithm,<br>
Math Horizons,<br>
November 2002, pages 24-25.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "doomsday.cpp">doomsday.cpp</a>, the source code.
</li>
<li>
<a href = "doomsday.hpp">doomsday.hpp</a>, the include file.
</li>
<li>
<a href = "doomsday.sh">doomsday.sh</a>,
BASH commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "doomsday_prb.cpp">doomsday_prb.cpp</a>,
a sample calling program.
</li>
<li>
<a href = "doomsday_prb.sh">doomsday_prb.sh</a>,
BASH commands to compile and run the sample program.
</li>
<li>
<a href = "doomsday_prb_output.txt">doomsday_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>DOOMSDAY_GREGORIAN:</b> weekday given any date in Gregorian calendar.
</li>
<li>
<b>I4_MAX</b> returns the maximum of two I4's.
</li>
<li>
<b>I4_MIN</b> returns the minimum of two I4's.
</li>
<li>
<b>I4_MODP</b> returns the nonnegative remainder of I4 division.
</li>
<li>
<b>I4_WRAP</b> forces an I4 to lie between given limits by wrapping.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>WEEKDAY_TO_NAME_COMMON</b> returns the name of a Common weekday.
</li>
<li>
<b>WEEKDAY_VALUES</b> returns the day of the week for various dates.
</li>
<li>
<b>YEAR_IS_LEAP_GREGORIAN</b> returns TRUE if the Gregorian year was a leap year.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 28 May 2012.
</i>
<!-- John Burkardt -->
</body>
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