转自：微点阅读   https://www.weidianyuedu.com/content/5817505177546.html

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

* JAVA的日期加减方法

*

* @author 老紫竹(学习文库,java.net)

*/

public class Test {undefined

public static void main(String[] args) throws Exception {undefined

Calendar calendar = Calendar.getInstance();

calendar.setTime(new Date());

System.out.println(calendar.get(Calendar.DAY_OF_MONTH));// 今天的日期

calendar.set(Calendar.DAY_OF_MONTH, calendar.get(Calendar.DAY_OF_MONTH) + 1);// 让日期加1

System.out.println(calendar.get(Calendar.DATE));// 加1之后的日期Top

Date d = new Date();

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

System.out.println("今天的日期：" + df.format(d));

System.out.println("两天前的日期：" + df.format(new Date(d.getTime() - 2 * 24 * 60 * 60 * 1000)));

System.out.println("三天后的日期：" + df.format(new Date(d.getTime() + 3 * 24 * 60 * 60 * 1000)));

}

}