user: Question: What is the date of Competition of 2008 Africa Cup of Nations?
Columns: ['Date', 'Venue', 'Score', 'Result', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['22 January 2008', 'Baba Yara Stadium , Kumasi , Ghan', '2–0', '3–0', '2008 Africa Cup of Nations']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Competition" = '2008 Africa Cup of Nations';