This dissertation aims at discussing the limits of the relation between subjectivity and time in the phenomenology of Edmund Husserl, seeking to think about the deep meaning that this originating relation has in the process of phenomenological fundamentation of philosophy. With the objective of undertaking a genetic analysis about time and subjectivity, we will use as our basis texts The Phenomenology of Internal Time-Consciousness and the Cartesian meditations. We will undertake, in a first moment, an investigation about the origin of time, an investigation which reveals that time has its origin in the absolute flux of subjectivity. In a second moment, it will be necessary to investigate the dynamics itself of the constitution of time by subjectivity. One such investigation reveals that the subjectivity is the absolute origin of any constitution, and thus, that it is also the origin of itself. But this genetic analysis reveals also that the absolute subjectivity is untimely ( unzeitlich ), yet only constitutes itself in its exercise of unfolding in time, in its fluent dispersion in time. Thus, it is necessary to discuss, in the last instance, how, in the constant process of the constitution of time, the subjectivity derives from that of which it is the origin itself.