The program calculates kaledndar year

The program calculates kaledndar year

The program calculates kaledndar year (1 to 5509) in
Julian, Gregorian (Europe), Gregorian (Russian) systems.
Displaying information in a modern and "creation of the world"
(Before the decree of Peter I) form. The ability to highlight the current date.
In addition, any 3 calendar months of the year.