Time travel to the future is easily possible. We don't have the ability yet, but will soon enough. However, there's no going back in time.

You can travel to the future by jumping in a space ship and going somewhere very, very fast. The closer to the speed of light you go, the faster thru time you will travel. Depending on how far and fast you go before returning to earth, is how much time will have passed here, compared to you.

A few months for you could be decades or centuries here on Earth.