Abstract
Since Newton's mechanics, time has had a special status in physical theories. On the one hand, it appears as a quantity like any other, represented by certain mathematical symbols. But on the other, its role as a quantity is different from that of the others, since it does not participate in the same way in the explanation of change. The aim of this presentation is to examine the possible lessons that can be drawn from variations in the representation of time in physical theories, with particular emphasis on the theory of quantum gravitation.