9th September 1947: Moth 'bug' discovered inside a Harvard computer

September 9, 1947
First Instance of Actual Computer Bug Being Found

At 3:45 p.m., Grace Murray Hopper records the first computer bug in her log book as she worked on the Harvard Mark II. The problem was traced to a moth stuck between a relay in the machine, which Hopper duly taped into the Mark II's log book with the explanation: “First actual case of bug being found.”
http://www.computerhistory.org/tdih/September/9/

https://www.nationalgeographic.org/thisday/sep9/worlds-first-computer-bug/

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