CREATE TABLE table_64706 ("Date" TEXT, "Event" TEXT, "Heat/Semifinal/Final" TEXT, "Nation" TEXT, "Time" TEXT)

What date was the men's 100m breaststroke in heat 6?
SELECT "Date" FROM table_64706 WHERE "Event" = 'men''s 100m breaststroke' AND "Heat/Semifinal/Final" = 'heat 6'
SELECT "Date" FROM "table_64706" WHERE "Event" = 'men\'s 100m breaststroke' AND "Heat/Semifinal/Final" = 'heat 6'