user: Question: What is Date, when Athlete is "Yussuf Alli"?
Columns: ['Nation', 'Distance', 'Athlete', 'Venue', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United States', '8.95m(29ft4¼in)', 'Mike Powell', 'Tokyo', '1991-08-30']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Athlete" = 'Yussuf Alli';