CREATE TABLE table_34408 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Attendance" FLOAT)

Which Date has a Game site of shea stadium, and a Week of 5?
SELECT "Date" FROM table_34408 WHERE "Game site" = 'shea stadium' AND "Week" = '5'
SELECT "Date" FROM "table_34408" WHERE "Game site" = 'shea stadium' AND "Week" = '5'