Theories of Time

Past, present, and future. Which is real and which is not? Philosophers have had various theories, and a century ago, philosopher JME McTaggart classified two common theories as the A series and the B series. He hoped to prove that time is unreal by arguing that time satisfies both the A series and the B series, and that those two theories contradict each other. Thus, time has no reality.

Here are all the possible theories. I have added the growing block universe, a halfway theory between presentism and eternalism, and also four other theories which I have named, and which seem to have no advocates.

TheoryPast?Present? Future?
Unreality
X
A series, presentismX
Growing block universeXX
X
XX
XX
B series, eternalism, block universeXXX
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