Chocolate is a confectionery containing cocoa (cocoa mass, cocoa butter, cocoa powder), sugar, and other additives (like milk, which is added to milk chocolate).
Directive 2000/36/EC of the European Parliament and of the Council of 23rd June defines chocolate as ...
Dates of National Chocolate Day vary from country to country. For instance, in the U.S. it is celebrated on October 28th, while in Poland on April 12th.