Julius Caesar was given (and ignored) the soothsayer's warning in Shakespeare's play. That has forever imbued this date with a sense of forboding.
But in Roman times the expression the "Ides of March" did not necessarily invoke a dark mood--it was simply the standard way of saying "March 15th." The "Ides" actually refers to the 15th day in March, May, July and October and the 13th in the other months.
At any rate, enjoy the day and don't worry!
