Remember this "glitch"?
Barack Obama signs wrong date in abbey visitor's book
Barack Obama made a gaffe during his state visit yesterday — signing Westminster Abbey’s visitors’ book with the incorrect year.
12:01AM BST 25 May 2011
The president dated his entry “May 24, 2008”, rather than the current year. He was heard to ask the Very Rev Dr John Hall, the Dean of Westminster, what the date was, but he still managed to get the year wrong.
https://www.telegraph.co.uk/news/worldnews/barackobama/8534672/Barack-Obama-signs-wrong-date-in-abbey-visitors-book.html