This question already has an answer here:
If it is the case that the information content of the universe is conserved, and the past can be constructed from a complete knowledge of the future just as easily as vice versa, then is there any reason to conceptualize the past as causally preceding the future, or do the terms "past" and "future" simply refer to "the direction of time in which entropy decreases" and "the direction in which it increases," respectively? If it's the latter, then does the universe's lower entropy in the past explain why information about the past is macroscopically accessible to us, but information about the future is not?
EDIT: To be more specific, the Second Law of Thermodynamics describes entropy as increasing "over time." By "over time," I assume it means "as we observe the past, followed by the future." My question is this: given conservation of information, is there an equally valid alternative way of describing time in which the Second Law states that entropy decreases over time, but "over time" is considered to mean "as we observe the future, followed by the past"? Is this alternative description, combined with complete knowledge of the final state of the universe, sufficient to reconstruct the entire history of the universe farther and farther into the past in such a way that the future appears to causally determine the past, just as we perceive the past as causally determining the future?