FTL= Faster Than Light's propagation speed
faster than ~186,264 miles per second

A person 40 light years away flashes his flash light for 1 second..
you see it for 1 second but
it took 40 years to get to where you are.
so it happened 40 yrs ago.
correct?
Yes,

OK,
1 second after you saw the light,
you flash over there
 (let's say instantly) .(pushed a button)
What time do you get there.?
You get there 40 yrs and 1 second later.

"Time does not change with speed."

Only bad math can prove time travel,
and FTL does not affect time at all.
and FTL has never been proven impossible.

James M Driscoll Jr.
Spaceman