Time travel possible or not?

basically black holes are massive structures in universe which they have max gravity which so much that even light don't come back. so according to science rule greater the amount of gravity slower the time period..... now imagine a spaceship goes in black hole and you are into that spaceship in black hole time is so slow that it actually stops but here on earth time is forwarding so when you come back yay you are in future..

@ENGINEERdarshan good theory but is there someone who tried ito

@sjvg1976 not yet