WtDate by Nico Peikert <Fox7@csi.com>:
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This is a program to calculate the day of the week by the date...
  e.g: You enter 22.10.79 and the program returns "Monday" !
  ==>  Very useful to e.g. calculate your birthday or historical
       events.

There are several more functions to e.g.  have an overview of all Fryday 13th or other days.

Options:
(1) You enter a date and the program return the day!
    NOTE: You must enter the date in the following format:
                  dd.mm.yyyy

(2) You enter a day of the month (format: dd) followed by a period
    (First: start date (Format: dd.mm.yyyy), second: end date (Format: 
    dd.mm.yyyy) )! The program calculates an overview of all days in 
    your period.

(3) You specify a period and the program calculates an overview of all
    days in your period. (Like Option 2, but specialized on the 13th.)

(4) Information on this program

(5) Quit the program