Century leap year refers to a watch feature that keeps track of a full century’s worth of leap years, meaning it is able to adjust the calendar for leap years that occur every four years. It is an essential feature for watches that are used for long-term timekeeping, such as chronometers, as it ensures that the watch can keep accurate time for many years to come. It is a useful feature for those who want to keep track of dates and anniversaries that may span multiple decades.
