user: Question: What date is listed for the team that has an Away team score of 20.21 (141)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '17.23 (125)', 'South Melbourne', '9.15 (69)', 'Corio Oval', 9500.0, '3 September 1932']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team score" = '20.21 (141)';