WEEKDAY
Determine the Day of the Week

WEEKDAY is a Python library which can determine the day of the week corresponding to a given date; for instance, the battle of Hastings, on 14 October 1066 (Julian Calendar!), was a Saturday.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

WEEKDAY is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:

DATES, a dataset directory which contains lists of dates in various calendar systems.

DOOMSDAY, a Python 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.

TEST_VALUES, a Python library which supplies test values of various mathematical functions.

Reference:

1. Lewis Carroll (Charles Dodgson),
   To Find the Day of the Week for Any Given Date,
   Nature, 31 March 1887.
2. Gary Meisters,
   Lewis Carroll's Day-of-the-Week Algorithm,
   Math Horizons,
   November 2002, pages 24-25.
3. Edward Reingold, Nachum Dershowitz,
   Calendrical Calculations: The Millennium Edition,
   Cambridge University Press, 2001,
   ISBN: 0-521-77752-6,
   LC: CE12.R45.
4. Edward Richards,
   Mapping Time, The Calendar and Its History,
   Oxford, 1999,
   ISBN: 0-19-850413-6,
   LC: CE11.R5.

Source Code:

• weekday.py the source code.
• weekday.sh, calls the tests.
• weekday.txt, the output file.

You can go up one level to the Python source codes.