Since his news conferences started, he's frequently referred to the "1917" pandemic. But there was no pandemic in 1917.
Perhaps he's a big fan of the Sam Mendes war movie, 1917?
Despite the fact that he's always going on (and on) about having a "high IQ", it's well known that Trump's not exactly well versed in history. In fact, a leaked White House memo to staff told them never to assume he knows basic facts about American history.
Still, someone needs to have a word and tell the stable genius himself that he's got the date wrong.