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By Einstein's definition, time is what clocks measure – but how can we define “clock” without referring to time? This tag is for such philosophical questions about the many unresolved issues concerning time. Though this includes questions about the interpretation of physical theories and concepts, if your question is about what current physics can quantitatively predict or explain, it is probably not about philosophy and therefore off-topic.

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Temporal logic tries to account for the affect that time has on the truth value of sentences. It's an extension of classical logic that adds some new operators. Classical logic is tenseless, meaning … that it's statements are independent of time beyond the present. It can make sense of statements like: "Bachelors are unmarried males." "If a number is even if and only if it is divisible …
answered Sep 30 '11 by Nathan