what happened at sept 1947?
From Wikipedia, is when the first bug was discovered :p:
The first software bug was recorded, in the Harvard Mark II electromechanical computer. The glitch was quite literally a "bug", as the error was traced to a moth trapped in a relay, which was carefully removed and taped to the log book.
https://en.wikipedia.org/wiki/September_1947#September_9,_1947_(Tuesday)