In James Cameron’s The Terminator, the Terminator travels back from 2029.
The film opens in a future where intelligent machines have fought humanity in a catastrophic war. Skynet sends a Terminator back to 1984 to kill Sarah Connor before the birth of her son, John Connor, who will become an important human resistance leader. Kyle Reese travels from the same future to protect Sarah.
The 2029 setting is part of the film’s fictional chronology, not a prediction presented as a real historical date. The Terminator was released in 1984 and uses time travel to connect its present-day story with a machine-dominated future.
The year can be confused with dates from later entries in the franchise, which expand and alter the timeline. The answer here refers specifically to the future shown and described in Cameron’s original film.