The existence of a hermitian time operator is proposed in the framework of non-relativistic quantum mechanics. The Heisenberg equation of motion is shown to yield constant rate of flow of time. It is shown to yield results consistent with classical expectations, when Bohr’s correspondence principle is invoked. Further, it is shown that a massless free particle with non-zero momentum experiences timelessness in its own frame of reference whereas a negatively massive particle perceives forwardness of time. Moreover, application to quantum harmonic oscillators shows instantaneous transition of electrons from one eigenstate to another.