Abstract
The text is divided into two parts. In the first part, the author describes the eternalists’ and presentists’ positions as the two basic possible statements of the ontology of time.In second part of the text the metaphysical implications of both positions are compared.In the end, presentism and eternalism turn out to be completely different positions that – in parallel with the famous McTaggart’s argument – claim a very strong reality of time on the one hand (presentism) or, on the other hand, its utter unreality (eternalism).