user: Question: what is the date when the opponent# is Iowa?
Columns: ['Date', 'Opponent#', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['09/30/1950', 'at Washington', 'Husky Stadium • Seattle, WA', 'L13-28', '49,500']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent#" = 'Iowa';