CREATE TABLE table_3699 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Replaced by" TEXT, "Date of appointment" TEXT)

Please mention those appointment dates those are replaced by alfredo aglietti
SELECT "Date of appointment" FROM table_3699 WHERE "Replaced by" = 'Alfredo Aglietti'
SELECT "Date of appointment" FROM "table_3699" WHERE "Replaced by" = 'Alfredo Aglietti'