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 | Game site | Record | Attendance |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | September 12 | at Cincinnati Bengals | L 7–17 | Riverfront Stadium | 0–1 | 53464.0 |
| 2.0 | September 19 | New York Jets | W 46–3 | Mile High Stadium | 1–1 | 62669.0 |
| 3.0 | September 26 | Cleveland Browns | W 44–13 | Mile High Stadium | 2–1 | 62975.0 |
| 4.0 | October 3 | San Diego Chargers | W 26–0 | Mile High Stadium | 3–1 | 63369.0 |
| 5.0 | October 10 | at Houston Oilers | L 3–17 | Astrodome | 3–2 | 45298.0 |
| 6.0 | October 17 | Oakland Raiders | L 17–10 | Mile High Stadium | 3–3 | 63431.0 |
| 7.0 | October 24 | at Kansas City Chiefs | W 35–26 | Arrowhead Stadium | 4–3 | 57961.0 |
| 8.0 | October 31 | at Oakland Raiders | L 6–19 | Oakland-Alameda County Coliseum | 4–4 | 52169.0 |
| 9.0 | November 7 | Tampa Bay Buccaneers | W 48–13 | Mile High Stadium | 5–4 | 62703.0 |
| 10.0 | November 14 | at San Diego Chargers | W 17–0 | San Diego Stadium | 6–4 | 32017.0 |
| 11.0 | November 21 | New York Giants | W 14–13 | Mile High Stadium | 7–4 | 63151.0 |
| 12.0 | November 28 | at New England Patriots | L 14–38 | Schaefer Stadium | 7–5 | 61128.0 |
| 13.0 | December 5 | Kansas City Chiefs | W 17–16 | Mile High Stadium | 8–5 | 58170.0 |
Question:
What was the date of the week 4 game?
Answer:
October 3