All such instruments which have been executed and the execution thereof proved by acknowledgment, as provided in 1944 Act No. 473 (1944 (43) 1323) since January 1, 1940 are hereby confirmed and ratified and the recordation of such instruments declared to be legal notice of the existence thereof as fully as if they had been duly executed and probated in conformity with the law of this State as it then existed with reference to the probate and recording of written instruments.