We have learned to approximate and then precisely measure time millennia ago through various means, yet never on this journey we learned to alter it, except by a miniscule margin using relativistic effects.
We can measure distance, and we can move things. We can measure illumination, and we can create light. We can measure sound, and produce it. Alter temperature? Yes! Produce all sorts of artificial radiation? Yes! Electric charge? Sure!
But time? Nuh-uh.
I would argue that moving things is not the same as changing a distance. If that were the case, then moving an event to a different time or our own moving forward in time would be the equivalent to moving an object through space, meaning we can alter time.
Hmm, fair!
Never thought of it that way. In these terms, spacetime is fairly consistent.