I can guarantee you 100% that time travel is not possible and will never be possible.
Because if it EVER was possible, we would have people from the future visiting constantly, there would be no way to police that for infinity.
“I can guarantee you 100% that time travel is not possible and will never be possible.”
I can 100% that you are time traveling right now at a pace of about one second into the furture every one second or so.