2 つの Joda-Time 日付の間の日数を正確に計算するにはどうすればよいですか?

Days.daysBetween(start.toLocalDate(), end.toLocalDate()).getDays()

// 5am on October 20th to 1pm on October 21st, 2013, Brazil
DateTimeZone BRAZIL = DateTimeZone.forID("America/Sao_Paulo");
DateTime start = new DateTime(2013, 10, 20, 5, 0, 0, BRAZIL);
DateTime end = new DateTime(2013, 10, 21, 13, 0, 0, BRAZIL);

// Using withTimeAtStartOfDay()
System.out.println(Days.daysBetween(start.withTimeAtStartOfDay(),
                                   end.withTimeAtStartOfDay()).getDays());

// Using toLocalDate()
System.out.println(Days.daysBetween(start.toLocalDate(),
                                   end.toLocalDate()).getDays());