What is the official "Start Date' of the internet?

Question

It's a bonus question for the midterm in my Cyber Crimes class. I need to know the official date that the internet started...

Answer 1

I believe it was created by the US military some time in the late 1960s.

Answer 2

Here

Answer 3

The first permanent connection on ARPANET (the internet's predecessor) was made on November 21, 1969.  The first message (the word "login") was sent over a temporary connection on October 29, 1969.