Java如何在Joda-Time中进行日期计算？
使用Joda-Time库可以简化日期计算过程。例如，我们可以轻松地增加或减少几天，几周，几个月或一年。此操作有加减法。例如，如果您要添加9个星期的日期对象，则可以执行date.plusWeeks(9)。
package org.nhooo.example.joda;
import org.joda.time.LocalDate;
public class DateCalculationDemo {
public static void main(String[] args) {
//创建我们要执行的LocalDate实例
//一些日期计算。
LocalDate date = new LocalDate(2019, 7, 1);
System.out.println("Date = " + date);
//将天，周，月，年值添加到日期对象中。
System.out.println("plusDays(10) = " + date.plusDays(10));
System.out.println("plusWeeks(9) = " + date.plusWeeks(9));
System.out.println("plusMonths(2) = " + date.plusMonths(2));
System.out.println("plusYears(1) = " + date.plusYears(1));
//从日期对象中减去天，周，月，年值。
System.out.println("minusDays(10) = " + date.minusDays(10));
System.out.println("minusWeeks(9) = " + date.minusWeeks(9));
System.out.println("minusMonths(2) = " + date.minusMonths(2));
System.out.println("minusYears(1) = " + date.minusYears(1));
}
}上面程序的输出是：
Date = 2019-07-01 plusDays(10) = 2019-07-11 plusWeeks(9) = 2019-09-02 plusMonths(2) = 2019-09-01 plusYears(1) = 2020-07-01 minusDays(10) = 2019-06-21 minusWeeks(9) = 2019-04-29 minusMonths(2) = 2019-05-01 minusYears(1) = 2018-07-01
Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=joda-time/joda-time/2.10.3/joda-time-2.10.3.jar -->
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.10.3</version>
</dependency>