The meaning of какова
Какова is a synonym of какая, it is a question word that means "what is she (it, feminine) like?" Какова is mainly used in literature, not in colloquial speech, and the answer implies the use of short adjectives.
Какова она? Красива и весела. What is she like? She is pretty and happy.
Какого is the Genitive case singular for masculine and neutral nouns of the question word какой.
Третьего декабря какого года? On the 3d of December of what year?