Originally published in 1980. The author's arguments here provide grounds for rejecting both the absolutist and the relativist theories of time and presents two new theories, shifting the traditional debate to a consideration of time as a theoretical structure and theoretical framework. Reviews of the original edition: "...Newton-Smith brings to bear the sharp analytical tools of modern philosophy. The whole subject is carefully examined at an abstract level, and a host of problems raised that would never have occurred to a simple-minded physicist. It is a rigorous and tough-minded book that makes great demands on the reader, yet well repays careful study.' Peter Hodgson, New Society