“In Italy, where they say ‘anno bisesto, anno funesto’ (which means leap year, doom year), there are warnings against planning special activities such as weddings. The reason? ‘Anno bisesto tutte le donne senza sesto’ which means ‘In a leap year, women are erratic.’”
This happens since nearly every four years the dates on the calendar don’t line up with the true year, or the amount of time it takes the Earth to orbit the sun. In other words, leap year is the year an extra day is added to the month of February to synchronize the seasons with the calendar.