weekday_zeller

weekday_zeller, an Octave 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.

Licensing:

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

Languages:

weekday_zeller is available in a MATLAB version and an Octave version and a Python version.

Related Data and Programs:

weekday_zeller_test

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

doomsday, an Octave 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.

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

Reference:

1. Nick Berry,
   Zeller's Congruence,
   https://datagenetics.com/blog/november12019/index.html
2. J R Stockton,
   The Calendrical Works of Rektor Chr. Zeller: The Day-of-Week and Easter Formulae.

Source Code:

• i4_wrap.m, wraps an I4.
• timestamp.m, prints the current YMDHMS date as a time stamp.
• weekday_check_common.m, checks that a weekday specification is legal.
• weekday_gregorian.m, weekday given any date in Gregorian calendar.
• weekday_julian.m, weekday given any date in the Julian calendar.
• weekday_to_name_common.m, returns the name of a Common weekday.
• weekday_values.m, returns the day of the week for various dates.