Java中两个日期之间的天数差异？

问题描述：

我需要找到两个日期之间的天数：一个来自报告，一个是当前日期。我的片段：

I need to find the number of days between two dates: one is from a report and one is the current date. My snippet:

  int age=calculateDifference(agingDate, today);

此处 calculateDifference 是私有方法， agingDate 和今天是日期对象，仅供您澄清。我已经关注了Java论坛的两篇文章， Thread 1 / 第2主题。

Here calculateDifference is a private method, agingDate and today are Date objects, just for your clarification. I've followed two articles from a Java forum, Thread 1 / Thread 2.

它在独立程序中工作正常但是当我将其包含在我的逻辑中以从报告中读取时，我得到了一个不寻常的值差异。

It works fine in a standalone program although when I include this into my logic to read from the report I get an unusual difference in values.

为什么会发生这种情况？如何解决？

Why is it happening and how can I fix it?

编辑：

与实际天数相比，我获得的天数更多。

I'm getting a greater number of days compared to the actual amount of Days.

public static int calculateDifference(Date a, Date b)
{
    int tempDifference = 0;
    int difference = 0;
    Calendar earlier = Calendar.getInstance();
    Calendar later = Calendar.getInstance();

    if (a.compareTo(b) < 0)
    {
        earlier.setTime(a);
        later.setTime(b);
    }
    else
    {
        earlier.setTime(b);
        later.setTime(a);
    }

    while (earlier.get(Calendar.YEAR) != later.get(Calendar.YEAR))
    {
        tempDifference = 365 * (later.get(Calendar.YEAR) - earlier.get(Calendar.YEAR));
        difference += tempDifference;

        earlier.add(Calendar.DAY_OF_YEAR, tempDifference);
    }

    if (earlier.get(Calendar.DAY_OF_YEAR) != later.get(Calendar.DAY_OF_YEAR))
    {
        tempDifference = later.get(Calendar.DAY_OF_YEAR) - earlier.get(Calendar.DAY_OF_YEAR);
        difference += tempDifference;

        earlier.add(Calendar.DAY_OF_YEAR, tempDifference);
    }

    return difference;
}

注意：

不幸的是，没有一个答案帮助我解决了这个问题。我已经在这个问题 http://sourceforge.net/projects/joda-time/files/joda-time/ =nofollow noreferrer> Joda-time 库。

Unfortunately, none of the answers helped me solve the problem. I've accomplished this problem with the help of Joda-time library.

答

我建议您使用优秀的 Joda Time 库而不是有缺陷的java.util.Date和朋友。你可以简单地写

I would suggest you use the excellent Joda Time library instead of the flawed java.util.Date and friends. You could simply write

import java.util.Date;
import org.joda.time.DateTime;
import org.joda.time.Days;

Date past = new Date(110, 5, 20); // June 20th, 2010
Date today = new Date(110, 6, 24); // July 24th 
int days = Days.daysBetween(new DateTime(past), new DateTime(today)).getDays(); // => 34

Java中两个日期之间的天数差异？

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