user: Question: What is the Week number on december 18, 1960?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 25, 1960', 'New York Giants', 'L 21-19', '44,598']
SQL:

assistant: SELECT "Week" FROM "Table" WHERE "Date" = 'december 18, 1960';