Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | September 11, 1966 | at Washington Redskins | W 38–14 | 48,643 |
| 2.0 | September 18, 1966 | Green Bay Packers | L 21–20 | 83,943 |
| 3.0 | September 25, 1966 | St. Louis Cardinals | L 34–28 | 74,814 |
| 4.0 | October 2, 1966 | at New York Giants | W 28–7 | 62,916 |
| 5.0 | October 8, 1966 | Pittsburgh Steelers | W 41–10 | 82,687 |
| 6.0 | Bye | Bye | Bye | Bye |
| 7.0 | October 23, 1966 | Dallas Cowboys | W 30–21 | 84,721 |
| 8.0 | October 30, 1966 | at Atlanta Falcons | W 49–17 | 57,235 |
| 9.0 | November 6, 1966 | at Pittsburgh Steelers | L 16–6 | 39,690 |
| 10.0 | November 13, 1966 | Philadelphia Eagles | W 27–7 | 77,698 |
| 11.0 | November 20, 1966 | Washington Redskins | W 14–3 | 78,466 |
| 12.0 | November 24, 1966 | at Dallas Cowboys | L 26–14 | 75,504 |
| 13.0 | December 4, 1966 | New York Giants | W 49–40 | 61,651 |
| 14.0 | December 11, 1966 | at Philadelphia Eagles | L 33–21 | 58,074 |
| 15.0 | December 17, 1966 | at St. Louis Cardinals | W 38–10 | 47,721 |
Question:
When did the 1966 Cleveland Browns play the Green Bay Packers?
Answer:
September 18, 1966