Question: What is the date of death of the director of film Difficult Years?
Sentence (from "Difficult Years"): Difficult Years  is a 1948 Italian drama film directed by Luigi Zampa and starring Umberto Spadaro, adapted from the 1946 short story "Vecchio con gli stivaliOld Man in Boots"), by the Sicilian author Vitaliano Brancati.
Relevant evidence: Yes