user: Question: What date was the Men's 100m breaststroke in Heat 6?
Columns: ['Date', 'Event', 'Heat/Semifinal/Final', 'Nation', 'Time']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['10 December', "Men's 100m breaststroke", 'Heat 6', 'Ukraine', '57.33']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Event" = 'Men''s 100m breaststroke' AND "Heat/Semifinal/Final" = 'Heat 6';