user: Question: On what date was the game against San Diego Chargers played?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 3, 1984', 'Cleveland Browns', 'W 33-0', 'Kingdome', '1–0', 59540.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'San Diego Chargers';