Method dayDelta

base/src/main/java/net/time4j/CalendarUnit.java:776–787

(
            PlainDate start,
            PlainDate end
        )

        }

        private static long dayDelta(
            PlainDate start,
            PlainDate end
        ) {

            if (start.getYear() == end.getYear()) {
                return end.getDayOfYear() - start.getDayOfYear();
            }

            return end.getDaysSinceUTC() - start.getDaysSinceUTC();

        }

    }