The Ides of March
The Ides of March is the name of March 15 in the Roman calendar. The term ides was used for the 15th day of the months of March, May, July, and October. The Ides of March was a festive day dedicated to the god Mars and a military parade was usually held. In modern times, the term Ides of March is best known as the date that Julius Caesar was killed in 709 B.C.
via Hancock News week of March 18 | Morris Sun Tribune | Morris, Minnesota.
… my guess is that they didn’t know what A.U.C. was in some of the items making the rounds …