Time is believed to be composed of the past, present and future. Of these three, the past is past only in reference to the present and the present is present only in relation to the past, future is future only in reference to the present. So all three being interdependent, even for their very existence, it has to be admitted by sheer force of logic that none of them is real. Therefore, time is not.
Experience is the only criterion by which the reality of anything can be decided. Of the three categories of time, past and future are not experienced by any, except when they appear in the present. Then it can be considered only as present. Even this present – when minutely examined – reduces itself into a moment which slips into the past before you begin to perceive it, just like a geometrical point. It is nobody’s experience. It is only a compromise between past and future as a meeting point. Thus present itself being only imaginary, past and future are equally so. Therefore, time is not.
Sri Atmananda Krishna Menon