Time does not exist. Time is a construct of the human mind based on observations of movements of heavenly bodies.
that would only be plausible if you subscribe to the falsifiable Anthropic Principle.
Impirical proof that time exists is the principle of Entropy.
Albert Einstein's general theory of relativity explains that what we perceive as the force of gravity in fact arises from the curvature of space and time. Einstein proposed that objects such as the sun and the Earth change this geometry.
if you fall from a cliff then time will become very real