Time аs Horizon of Understanding of Being in the Fundamental Ontology

This article deals with the notion of time in the Martin Heidegger's fundamental оntology. The conceptual deference between the ordinary understanding of time and its ontological comprehension as temporality is made here. Namely the time of the ordinary understanding is guided by the moment of “now”, but the temporality as the meaning of human being (of Dasein) has to be treated on the base of its ecstatical character. It is shown in which way the temporality as the ontological meaning of human being can be the condition of possibility of any understanding of being in general.