doomsday


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.

Licensing:

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

Languages:

doomsday 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.

weekday, a Python code which determines the day of the week for a given day.

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.

Reference:

  1. John Conway,
    Tomorrow is the Day After Doomsday,
    Eureka,
    Volume 36, October 1973, pages 28-31.

Source Code:


Last revised on 21 January 2020.