Every four years, we get to experience a phenomenon known as “leap year.” This occurs when February has 29 days rather than its usual 28. The “leap” refers to the reoccurrence of days from one year to the next. Normally, a given date that occurs during a given year will occur one day later in the subsequent year. For example, January 1, 2023, occurred on a Sunday whereas January 1, 2024, occurred on a Monday of the following year.