This dissertation’s contribution consists in providing a novel interpretation of the role time plays in Kant’s transcendental idealism. A significant part of Kant scholarship on the Critiques tends to assume that time, as understood in transcendental philosophy, is solely a formal property of intuition. This assumption has led several commentators to overlook a fundamental feature of transcendental idealism, namely, that in being the most basic form of intuition time is, also, a provider of content in and for experience. In looking attentively at such feature this dissertation shows that time is the activity of the self that grounds the possibility of objectivity and explores the philosophical implications of such an interpretation. In t...