CREATE TABLE table_43153 ("Week" FLOAT, "Date" TEXT, "Time  (  PT  ) " TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game site" TEXT)

How many weeks have September 14, 2008 as the date?
SELECT SUM("Week") FROM table_43153 WHERE "Date" = 'september 14, 2008'
SELECT SUM("Week") FROM "table_43153" WHERE "Date" = 'september 14, 2008'