If there is no way to define an unambiguous time ordering, then you cannot use a "flow" of time picture to describe time. In other words, despite the everyday perception of time as something that marches ever onward, in reality we live in a "block" universe where nothing moves.
Also, our own perception of time depends on this "block universe where nothing moves" changing and enabling some synapses and chemical reactions in our brains. Hence, a change in this block could take an "eternity" (of real time, if there were such a thing) and we would only notice it as an infinitesimal moment.
Or so was supposedly Gödel's argument.