CREATE TABLE table_33140 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Attendance" CLOB)

What was the date when the attendance was 77,918?
SELECT "Date" FROM table_33140 WHERE "Attendance" = '77,918'
SELECT "Date" FROM "table_33140" WHERE "Attendance" = '77,918'