Now that zombies have taken over the world, the living have built a walled-in city to keep the dead out. But all's not well where it's most safe, as a revolution plans to overthrow the city leadership, and the zombies are turning into more advanced creatures.
Cholo mentions working for Kaufman for 3 years, and a mechanic claims that there haven't been any working cars in 3 years, suggesting an outbreak (that most assume is Night of the Living Dead) to have began 3 years ago. One could assume Tom Savini's Machete character could survive as a zombie for 3 years, considering he's a bad-ass. Unfortunately, the technology doesn't match for 1980, so the film is likely set in its release year 2005.