Given a date, how do you obtain a new date equal to the same month and day of month in the following year? You can't do that consistently with a duration measu

Given a date, how do you obtain a new date equal to the same month and day of month in the following year? You can't do that consistently with a duration measured in milliseconds or nanoseconds. Instead, you need a more abstract representation of time, something akin to "increment only the year field of a date". That's what Periods are for.