Subspace field theory--or rather Zephram Cochrane--figured out that time dilation only applies between multiple simultaneous events when one of the actors is within a moving gravitational field (i.e. a subspace field). In this case, the effect of time dilation is really a consequence of the the sub-space region having slightly different energy constants; in other words, it is not time that dilates, but the speed of light of in a vacuum.
I hope that is a joke.
Gravitational time dilation has never had anything to do with movement
... time is different relative to the distance between any point in space-time and a large mass (which is an over simplification as the radial distance is also effected by gravitation).
Which begs the question... Who is making this stuff up?