CREATE TABLE table_12346 ("Name" CLOB, "Circuit" CLOB, "Date" CLOB, "Winning driver" CLOB, "Winning constructor" CLOB, "Report" CLOB)

What day was the circuit Isle of Man?
SELECT "Date" FROM table_12346 WHERE "Circuit" = 'isle of man'
SELECT "Date" FROM "table_12346" WHERE "Circuit" = 'isle of man'