Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_56646 ( "Race" text, "Date" text, "Location" text, "Pole Position" text, "Fastest Lap" text, "Race Winner" text, "Constructor" text, "Report" text )

### Question ###
What day did Patrick Tambay have the fastest lap?

### Accurate SQL ###

SELECT "Date" FROM table_56646 WHERE "Fastest Lap" = 'patrick tambay'