Like most years, the dates for the Sundays in March are the same as those in February. Every four years, we have a leap year. Why? A year is 365.25 days –more precisely, 365d 5h 48m 47.26s. It used to mess up the solar calendar. That gave rise to the need to reconcile those leftover hours, minutes, and seconds. February 29 reconciles those days as we leap over them every four years – we redeem these partial days.