CREATE TABLE table_56660 ("Date" CLOB, "Visitor" CLOB, "Score" CLOB, "Home" CLOB, "Decision" CLOB, "Attendance" FLOAT, "Record" CLOB)

On what date was the attendance greater than 18,118 when Colorado was the visitor?
SELECT "Date" FROM table_56660 WHERE "Attendance" > '18,118' AND "Visitor" = 'colorado'
SELECT "Date" FROM "table_56660" WHERE "Attendance" > '18,118' AND "Visitor" = 'colorado'