java 日期加天数得到新的日期

转  http://blog.csdn.net/onafioo/article/details/7824016

package com.zhang.test;

import java.text.SimpleDateFormat;

import java.util.Date;

import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;

public class Test {

 public static Date addDate(Date d,long day) throws ParseException {

  long time = d.getTime(); 

  day = day*24*60*60*1000; 

  time+=day; 

  return new Date(time);

  }

 /**

  * @param args

  */

 public static void main(String[] args) {

  /*

  java.util.Date dt=new java.util.Date();

  System.out.println(dt);   //输出结果是：Wed Aug 10 11:29:11 CST 2005

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

  System.out.print(sdf.format(dt) + 12); 

  */

  Date d = new Date(); 

  

  Date newDate = addDate(d, 12); 

  

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

  System.out.println(dateFormat.format(d));

  System.out.println(dateFormat.format(newDate));

 }

}