java - 为什么 daysBetween 这里是错误的？

Question

我正在尝试计算两个日期之间的天数，如下所示:

public static int getDaysBetweenTwoDates(final LocalDateTime oldDate,
        final LocalDateTime newDate) {
    System.out.println("--Calculate days between: " + oldDate.toString()
            + "->" + newDate);
    Days days = Days.daysBetween(new DateMidnight(oldDate.toDateTime()),
            new DateMidnight(newDate.toDateTime()));
    System.out.println("----DIFF: " + days.size());
    return days.size();
}

嗯，我不明白为什么在 12 月 10 日到 12 月 28 日之间它返回“1”作为结果:

--Calculate days between: 2011-12-10T00:00:00.000->2011-12-28T12:01:07.577
----DIFF: 1

你看出什么原因了吗？

更新:我也试图保持简单，但它仍然不起作用:

Days days = Days.daysBetween(oldDate, newDate);

Answer 1

尝试days.getDays()。根据JavaDoc BaseSingleFieldPeriod 中的 size()(它是 Days 的父类(super class)):

Gets the number of fields that this period supports, which is one.