Today is the Ides of March, the 15th day of the month made famous by the assassination of Julius Caesar in 44 BC, an assassination which was predicted by a "soothsayer." The killing of Caesar was then made even more famous by Shakespeare in his Julius Caesar play. "Beware the Ides of March."
In any event, this particular Ides was not an unusual date because in the Roman Calendar the midpoint of each month was called the Ides. Interestingly the first of each Roman month was named the Kalends and this was the day taxes were due.
In the US, taxes are due on the 15th, the Ides of April.