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This work introduces the Geometric Extension of Physical Time (OIT-GEPT), a theoretical framework in which information is treated as an additional ontological coordinate extending 4-dimensional spacetime to a 5-dimensional manifold. The proposal is motivated by operational considerations showing that physically distinguishable histories may share identical spacetime trajectories while differing in their informational structure. The extended manifold is defined by coordinates and endowed with an invariant metric of the form: dΣ² = c²dt² − dℓ² + k₀² dI², where k0 is a universal conversion constant with dimensions [m/bit], relating informational increments to geometric scale in a manner analogous to the role of c in relating space and time. In the minimal formulation (Level 1), the coefficient k0 is taken to be constant at Planck order, ensuring that the extended geometry preserves standard relativistic and quantum dynamics at leading order. This extension leads to a generalized proper time: dτ₅² = dτ₄² + (k₀² / c²) dI², which incorporates informational variation as an intrinsic geometric contribution. Within this framework we introduce an informational current and a scalar excitation — the infoton— describing informational exchange through derivative couplings that act primarily as phase-modulating structures rather than energetic carriers. The framework preserves Lorentz invariance in the spacetime sector while introducing a new invariant structure associated with informational increments. The proposed geometry provides a minimal kinematic framework in which informational accumulation and temporal evolution can be treated within a single invariant structure, remaining compatible with General Relativity and standard quantum theory at leading order. Possible physical realizations and effective variations of the informational metric coefficient are left to higher-order extensions. https://orcid.org/0009-0002-3646-1493