CREATE TABLE table_55884 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Attendance" CLOB, "Record" CLOB)

On what date was there a game in which the opponent was the Detroit Tigers, and the attendance was 38,639?
SELECT "Date" FROM table_55884 WHERE "Opponent" = 'detroit tigers' AND "Attendance" = '38,639'
SELECT "Date" FROM "table_55884" WHERE "Attendance" = '38,639' AND "Opponent" = 'detroit tigers'