Is there a "flow" of time or temporal "becoming"?

pp. 314-329

in: Adolf Grünbaum, Philosophical problems of space and time, Berlin, Springer, 1973

Abstract

It is clear that the anisotropy of time resulting from the existence of irreversible processes consists in the mere structural differences between the two opposite senses of time but provides no basis at all for singling out one of the two opposite senses as "the direction" of time. Hence the assertion that irreversible processes render time anisotropic is not at all equivalent to such statements as "time flows one way."