What year was Planet Of The Apes" starring Roddy McDowell was set in?

Astronauts Taylor (Heston), Landon (Robert Gunner), Stewart (Dianne Stanley), and Dodge (Jeff Burton) are in deep hibernation when their spaceship crash-lands in a lake on an unknown planet in the year 3978 A.D., after a 2006-year voyage at near-light speed (during which the crew ages only 18 months due to time dilation). The planet has no moon and the clouds at night are luminous. The astronauts awaken to find Stewart's decomposed body, and that their ship is sinking. They use an inflatable raft to reach shore. Once there, Dodge performs a soil test and pronounces the soil incapable of sustaining life,.