java时间推算

package com.gxzhuangxing.base.modules.coupon.service;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class Test {
public static void main(String[]arg){
<pre name="code" class="java">	    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

System.out.println(sdf.format(date));
<pre name="code" class="java">	    Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
calendar.add(calendar.DATE,19);//把日期往后增加19天.整数往后推,负数往前移动
date=calendar.getTime();   //这个时间就是日期往后推19天的结果
System.out.println(sdf.format(date));
}

}