CREATE TABLE table_27139 ("Round" FLOAT, "Circuit" TEXT, "Date" TEXT, "Class A Winner" TEXT, "Class B Winner" TEXT, "Class C Winner" TEXT, "Class D Winner" TEXT)

When did Alan Hutcheson won Class B on round 1?
SELECT "Date" FROM table_27139 WHERE "Class B Winner" = 'Alan Hutcheson' AND "Round" = '1'
SELECT "Date" FROM "table_27139" WHERE "Class B Winner" = 'Alan Hutcheson' AND "Round" = '1'