CREATE TABLE table_name_73 (date VARCHAR, winning_driver VARCHAR, location VARCHAR)

What is the date that Ayrton Senna was the drive in Monza?
SELECT date FROM table_name_73 WHERE winning_driver = "ayrton senna" AND location = "monza"
SELECT "date" FROM "table_name_73" WHERE "ayrton senna" = "winning_driver" AND "location" = "monza"