3-month calendar (calendar).
Description: The program displays the calendar of 3 consecutive months. Cursor keys and
function keys may be used to go 1 month or 1 year backward or forward, to choose a given month and year, as well as
to change the display language of month and day names (English, French, German and Luxembourgish). The usage of the
different keys is explained below the calendar display.
Issue: The letters in month and day names are displayed without accents.
Free Pascal features: The Crt unit with colored output, writing text at a given position of
the console window, reading the keyboard key that has been pressed. Getting the actual date and time, working with dates.