user: Question: What date was Fitzroy the away team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Collingwood', '8.9 (57)', 'Richmond', '16.13 (109)', 'Victoria Park', 29888.0, '19 April 1980']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team" = 'Fitzroy';