How to Build a Time Machine (2016)

The year is 2036. Decades after the global nuclear war, an American soldier named John Titor is assigned to travel back to 1975 and retrieve an IBM 5100 computer. During this mission, John makes an unexpected stop in 2000 “for personal reasons.” He connects with his family -- and his 2-year-old self! And he interacts online with a group of time travel enthusiasts, sharing information about the future and a detailed description of how his time machine works.
Today, many think John’s tale was a hoax. But he also has die-hard followers who strongly believe they spoke with a man from the future.