如何计算两个日期之间的年数差异? [英] How do I calculate the number of years difference between 2 dates?

问题描述

如何计算Java中两个日历之间的年数差异?

How do I calculate the number of years difference between 2 calendars in Java?

推荐答案

首先，您需要确定哪个比另一个年龄大.然后利用 while 循环，在其中测试旧版本是否不是 <代码> Calendar#add() 和一个( 1 )

First you need to determine which one is older than the other. Then make use of a while loop wherein you test if the older one isn't after() the newer one. Invoke Calendar#add() with one (1) Calendar.YEAR on the older one to add the years. Keep a counter to count the years.

开球示例:

Calendar myBirthDate = Calendar.getInstance();
myBirthDate.clear();
myBirthDate.set(1978, 3 - 1, 26);
Calendar now = Calendar.getInstance();
Calendar clone = (Calendar) myBirthDate.clone(); // Otherwise changes are been reflected.
int years = -1;
while (!clone.after(now)) {
    clone.add(Calendar.YEAR, 1);
    years++;
}
System.out.println(years); // 32

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也就是说，Java SE中的 Date 和 Calendar API实际上是史诗般的失败.正在为即将到来的Java 8计划新的Date API，即 JSR-310 这与 Joda-Time 非常相似.到目前为止，您可能要考虑Joda-Time，因为它确实可以简化这样的日期/时间计算/修改.这是使用Joda-Time的示例:

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That said, the Date and Calendar API's in Java SE are actually epic failures. There's a new Date API in planning for upcoming Java 8, the JSR-310 which is much similar to Joda-Time. As far now you may want to consider Joda-Time since it really eases Date/Time calculations/modifications like this. Here's an example using Joda-Time:

DateTime myBirthDate = new DateTime(1978, 3, 26, 0, 0, 0, 0);
DateTime now = new DateTime();
Period period = new Period(myBirthDate, now);
int years = period.getYears();
System.out.println(years); // 32

更简洁明了，不是吗?

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