11h 51min, jan 1, 3400 y BC - Cuneiform First Used

Description:

-Cuneiform writing first seen around 3,400 BCE.
-Not a language
-Used pictures to represent sound
-Written on clay with a reed
-It was invented to keep records of goods and services, and the language that was recorded was, as far as we can tell, Sumerian.

Source:
1.http://etcsl.orinst.ox.ac.uk/edition2/cuneiformwriting.php
2.https://www.historyextra.com/period/ancient-egypt/cuneiform-6-things-you-probably-didnt-know-about-the-worlds-oldest-writing-system/