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drnickbone comments on [Poll] Less Wrong and Mainstream Philosophy: How Different are We? - Less Wrong
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B-theory: Specifying the temporal ordering of all events in space-time exhausts all the objective temporal facts about those events.
A-theory: Specifying the temporal ordering of all events in space-time does not exhaust all the objective temporal facts about them. There is a further temporal fact about a given event: whether it is in the past, in the present or in the future. These are objective facts that are not fixed by merely specifying which events happen earlier or later.
Here's maybe another way of thinking about it ...
A theory: The English sentence "Today is a Thursday" has the same meaning on all days when it is spoken, but its truth-value varies depending on when it is spoken. (The sentence always corresponds to the same proposition, but that proposition has variable truth value).
B theory: The English sentence "Today is a Thursday" means something different when it is spoken on different occasions. Each specific utterance has a truth value which never changes. (Again, each utterance corresponds to a different proposition, but any one such proposition always has the same truth value.)
If you can live with propositions whose truth value changes with time, then you're probably an A-theorist. If something smells fishy about that, and you think that in any given possible world, a proposition is either true or false and never changes its truth value, you're probably a B-theorist.