user: Question: What date has a Tie Number of 4?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Birmingham', '2–0', 'Port Vale', '24 January 1931']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Tie no" = '4';