weekday, a Python code 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.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
weekday is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
dates, a dataset directory which contains lists of dates in various calendar systems.
doomsday, a Python code 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 code which supplies test values of various mathematical functions.
weekday_zeller, a Python code which uses Zeller's congruence to determine the day of the week corresponding to a given date, such as 13 July 1989, Gregorian calendar, ... which was a Thursday.