This paper presents a novel derivation of Planck’s constant grounded in the geometric and energetic structure of time. Drawing from Chronos Theory—which reconceptualizes time as a dynamic, physical field rather than a passive parameter—it challenges a core assumption embedded in modern physics. By addressing the overlooked role of time’s structure, the work demonstrates that Planck’s constant can be derived rather than assumed. This discovery reframes the constant not as fundamental and inexplicable, but as an emergent resonance within a deeper time field. Building on the foundation established by the Chronos field Lagrangian, this paper offers the first applied derivation using the corrected temporal framework—marking a shift toward unifying constants through structured time.