ModusPwnd
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I like thinking about time with an entropy perspective. In some ways its more intuitive than the usual relativistic way of looking at it. Clocks are devices which increase in entropy in a 'regular' fashion, with regular being defined as having constant ratios with other 'clocks'. The beginning of the universe has the lowest entropy possible, and thus was the earliest time possible. The macrostate of the small early universe has very, very few microstates associated with it. The end game of a heat death is a macrostate with the most possible microstates associated with it, this would be the end of time. If the universe is a closed system then both the early universe and late universe are accessible microstates and the entropy is constant, but any sub-system considered would not necessarily be like that.
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