Temporal turn in philosophy was a consequence of crisis in metaphysics. It offered a project of new ontology, based on coordination of concepts of time and being. But the results and volume of phenomenological study of time are not studied enough. It is necessary to analyse the development of ontology of time in order to describe it in modern times. This article deals with these aspects. Heidegger adopted Husserl's intension that time must be interpreted as the subjective, and uses the principles of ontology of time, which Hegel employed in his conception of time. Hegel talks about spirit, Heidegger makes the spirit more concrete as subject and existence. Basing on this, Heidegger builds interconnection between time and being. Since existence is clearance of being, simultaneously it is the temporary of temporariness. Therefore being shows itself in time, and it is the special time of human reality. Another important component for Heidegger's ontology of time is relation between being and nothingness, because existence projects itself in nothingness to think being there. Sartre, as well as Heidegger, progresses in the framework of principles of ontology of time. In phenomenological philosophy time is interpreted as a way of self-disclosure of being, and an important moment is the subjectivity of selfness. Sartre and Heidegger develop the principles of phenomenological ontology of time in subjectivity direction. They form the concept of time by means of relating being and nothingness. Thus in Sartre's philosophy the past and the future ontologically meet in the project of presence as structures of being-in-self and being-for-self. Being-for-self flows to future away from being-in-self, but in the future it finds another being-in-self, which it wants to become but cannot, because it is existence of being-for-self. Structure of time is the defining structure of being, which is understood as the development of being. These principles should be considered necessary for constructing any ontology of time. Development of phenomenological philosophy is possible by means of building interconnection between structures of being and time.
