LocalDate.plus Incorrect Answer : <p>Java's LocalDate API seems to be giving the incorrect answer when calling <code>plus(...)</code> with a long <code>Period</code>, where I'm getting an off by one error. Am I doing something wrong here?</p>

<pre class="lang-java prettyprint-override"><code>import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
import java.time.temporal.ChronoUnit;

public class Main
{
    public static void main(String[] args)
    {
        // Long Period
        LocalDate birthA = LocalDate.of(1965, Month.SEPTEMBER, 27);
        LocalDate eventA = LocalDate.of(1992, Month.MAY, 9);
        LocalDate halfA = eventA.plus(Period.between(birthA, eventA));
        System.out.println(halfA); // 2018-12-21 ????
        System.out.println(ChronoUnit.DAYS.between(birthA, eventA)); // 9721
        System.out.println(ChronoUnit.DAYS.between(eventA, halfA)); // 9722 ????

        // Short Period
        LocalDate birthB = LocalDate.of(2012, Month.SEPTEMBER, 10);
        LocalDate eventB = LocalDate.of(2012, Month.SEPTEMBER, 12);
        LocalDate halfB = eventB.plus(Period.between(birthB, eventB));
        System.out.println(halfB); // 2018-09-14
        System.out.println(ChronoUnit.DAYS.between(birthB, eventB)); // 2
        System.out.println(ChronoUnit.DAYS.between(eventB, halfB)); // 2
    }
}
</code></pre>
