user: Question: Name the number of date for Shea Stadium
Columns: ['Week', 'Date', 'Opponent', 'Time ( ET )', 'TV', 'Result', 'Record', 'Game Site']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Monday September 19', 'San Francisco 49ers', '9:00pm', 'ABC', 'W 27–0', '1–0', 'Three Rivers Stadium']
SQL:

assistant: SELECT COUNT("Date") FROM "Table" WHERE "Game Site" = 'Shea Stadium';