'Time' is not an innate thing, it's a man-made tool

From a purely scientific perspective, there is no such thing as 'time'. There are just particles moving through space in an infinite universe. To go back in 'time' you would need to put every particle in an infinite space back to where it had been. Likewise project where they are headed to go to the 'future'. Time is just a useful man made measurement that we use to stay coordinated with each other. It's no more of an innate entity than are inches and centimeters.