user: Question: On which date was the position less than 4 at Piraeus?
Columns: ['Pos.', 'Mark', 'Athlete', 'Venue', 'Date']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '2.43m(7ft11½in)', 'Javier Sotomayor ( CUB )', 'Budapest', '4 March 1989']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Pos." < 4.0 AND "Venue" = 'Piraeus';