It contains descriptions of two mainstream contrasting views and dozens of other concepts or philosophies about how the time could be perceived. Two mainstream views are tensed and tenseless theories of time, and other concepts would be for example Geroch's theorem, Godel's rotating universe, Einstein's relativity, Galilean's relativity, McTaggart's argument, Poincare's conventionalism, Leibniz's relationalism, Newtonian time, Rabi's atomic clock, Nietzsche's eternal recurrence, and so so many more.
This book is a true philosophical and/or freethinking feast. Every page, or double page, offers a view that lights up another angle of what is and was out there in terms of understanding the time. The basic philosophical quest is still firmly here. Questions like is there a time? and if yes how it behaves, standing or moving? and if moving how fast? in which direction? has been answered many different ways. So technically, there is no one particular view tat rules out all the others, and the debate is still on.
In the end, it's only a question of choosing right concepts that appeal to you, and try to understand them to the ground, so you can see the point clearly. And then the more clear points you can see, the more options you have to choose for yourself, which ones are more realistic, and which ones less. This gives the reader the exercise in imagination, streching it out a litlle bit. I recommend that you will try it out for yourself to see which concepts ring the bell, and which sound totally useless and immature. It's worth the journey.