The idea of a time t that flows by itself, and in relation to which all things evolve, is no longer a useful one. The world is not described by equations of evolution in time t. What we must do is simply enumerate the variables A, B, C . . . that we actually observe, and write equations expressing relations between these variables, and nothing else: that is, equations for the relations A(B), B(C), C(A) . . . that we observe, and not for the functions A(t), B(t), C(t) . . . , which we do not observe.
