CREATE TABLE table_39901 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Record" CLOB, "Game Site" CLOB, "Attendance" FLOAT)

When did they play at Candlestick Park?
SELECT "Date" FROM table_39901 WHERE "Game Site" = 'candlestick park'
SELECT "Date" FROM "table_39901" WHERE "Game Site" = 'candlestick park'