I had a similar realization that made me feel kind of old.
So as much time has passed between Turnabout Intruder and The Undiscovered Country (22 years) as has passed from The Undiscovered Country until the present day (22 years), the year of Star Trek Into Darkness.
I saw Into Darkness in the theaters recently. It was pretty good.
And yes, I know if you take months into account (as opposed to just going by the year as I did), the time spans are not quite equal. But it will be true pretty soon.