The last discovered use of hieroglyphs dates to August 24, 394.

An excerpt from the article 15 facts about Egypt

They were carved in a temple on the island of Philae in southern Egypt. The inscription is dedicated to the Nubian deity Mandulis - the patron of the sky and the sun. The deity was depicted as a man with a hanging chest and wearing an Atef crown.

The inscription, carved in hieroglyphic writing, read:

"Before Mandulis, son of Horus, by the hand of Nesmeterakhem, son of Nesmeter, the Second Priest of Isis, for all time and eternity. Words were spoken by Mandulis, lord of the Abaton, great god."