CREATE TABLE table_49575 ("Date" TEXT, "Place" TEXT, "Race winners" TEXT, "GP winner" TEXT, "Source" TEXT)

What is the date for a source of result and a place of iffendic?
SELECT "Date" FROM table_49575 WHERE "Source" = 'result' AND "Place" = 'iffendic'
SELECT "Date" FROM "table_49575" WHERE "Place" = 'iffendic' AND "Source" = 'result'