Night Dale!
Well, if we ballpark it......(just for fun)
Speed of the Earth's Rotation at the Equator:
Circumference of the Earth at the Equator =
40,000 kilometers
Time to complete one Rotation =
24 hours
Speed of Rotation = Distance/Time = 40,000 km / 24 hr =
1670 km/hr
So, we can average a timezone at the equator to be 1670 km in width, since each is an hour's worth of rotation. The actual distance varies depending on latitude.
Let's further say that we'd change the time zone when it was
1/2 way "
through" being wrong. So that means we adjust it at 835 km of change. Meh. Guess.
The USA and Europe are separating at "about an inch per year". It probably varies a bit each year. I haven't been able to find an exact figure...so we'll ballpark it at 1 inch. Of course, that messes up the metric km stuff. So we convert 1 inch to 2.54 cm. We convert the km to 100,000 cm.
If we travel 2.54 cm per year and need to travel 835km (83,500,000 cm) to change the Daylight Saving Time, we have 83,500,000 / 2.54 = 32,874,015.7480315 years. So 33 million years, give or take.
That's probably a bit high considering I used equatorial measurements for total distance but the 1 inch per year is probably from a higher latitude...But...yeah.
It will fix itself. You just have to live a few 10's of millions of years!
EDIT: Estimating 22 million years at NYC latitude (cos 40 degrees = about .6666 of the radius at the equator)...but IDK where they took the "one inch per year" measurement at.