Miss jumps following an NPC's wormhole

[Switeck]

That assumes misjumps are exactly half the distance of the regular jump. Sometimes, misjumps are slightly more or less than half due to rounding up or down. In any case, you could get close to the right time...but doubtful it could get accurate to the second.

[Commander McLane]

If we know how far we traveled, and we know the amount of "real-world" time that a witchspace jump takes per ly; couldn't we just calculate what the current time is when we arrive?

That's probably what your ship computer is doing while you see it adjusting your clock.