user: Question: What day did Patrick Tambay have the fastest lap?
Columns: ['Race', 'Date', 'Location', 'Pole Position', 'Fastest Lap', 'Race Winner', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Brazilian Grand Prix', '13 March', 'Jacarepaguá', 'Keke Rosberg', 'Nelson Piquet', 'Nelson Piquet', 'Brabham - BMW', 'Report']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Fastest Lap" = 'Patrick Tambay';