Question: What is the date of birth of the director of film Iron Earth, Copper Sky?
Sentence (from "Iron Earth, Copper Sky"): The film, which premiered in the Un Certain Regard section at the 1987 Cannes Film Festival on 4 May 1987, won the OCIC Award at the 1987 San Sebastián International Film Festival and a German Camera Award for Jürgen Jürges.
Relevant evidence: No