CREATE TABLE table_19340 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Time  (  ET  ) " CLOB, "TV" CLOB, "Result" CLOB, "Record" CLOB, "Game Site" CLOB)

Name the number of date for shea stadium
SELECT COUNT("Date") FROM table_19340 WHERE "Game Site" = 'Shea Stadium'
SELECT COUNT("Date") FROM "table_19340" WHERE "Game Site" = 'Shea Stadium'