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 | Final score | Team record | Game site | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 19 | New York Giants | L 40–42 | 0–1 | Lambeau Field | 56263.0 |
| 2.0 | September 26 | Denver Broncos | W 34–13 | 1–1 | Milwaukee County Stadium | 47957.0 |
| 3.0 | October 3 | Cincinnati Bengals | W 20–17 | 2–1 | Lambeau Field | 56263.0 |
| 4.0 | October 10 | at Detroit Lions | L 28–31 | 2–2 | Tiger Stadium | 54418.0 |
| 5.0 | October 17 | Minnesota Vikings | L 13–24 | 2–3 | Lambeau Field | 56263.0 |
| 6.0 | October 24 | at Los Angeles Rams | L 13–30 | 2–4 | Los Angeles Memorial Coliseum | 75531.0 |
| 7.0 | November 1 | Detroit Lions | T 14–14 | 2–4–1 | Milwaukee County Stadium | 47961.0 |
| 8.0 | November 7 | at Chicago Bears | W 17–14 | 3–4–1 | Soldier Field | 55049.0 |
| 9.0 | November 14 | at Minnesota Vikings | L 0–3 | 3–5–1 | Metropolitan Stadium | 49784.0 |
| 10.0 | November 22 | at Atlanta Falcons | L 21–28 | 3–6–1 | Atlanta Stadium | 58850.0 |
| 11.0 | November 28 | New Orleans Saints | L 21–29 | 3–7–1 | Milwaukee County Stadium | 48035.0 |
| 12.0 | December 5 | at St. Louis Cardinals | T 16–16 | 3–7–2 | Busch Stadium | 50443.0 |
| 13.0 | December 12 | Chicago Bears | W 31–10 | 4–7–2 | Lambeau Field | 56263.0 |
Question:
What day were the Denver Broncos the opponent?
Answer:
September 26