java得到14天前和14天后日期，在线等

Question

java得到14天前和14天后日期,并按下面的格式输出，
yyyy-MM-dd怎么得到呀，thanks

Answer 1

date 单独设置某天 某月  cals.getTime()
SimpleDateFormat 按格式打印  
calendar  加减日期 long now=System.currentTimeMillis();
System.out.println(now);
    Date date=new Date();
    date.setDate(1);
    System.out.println(date.getYear()+1900);
    System.out.println(date.getMonth()+1);
    System.out.println(date.getDate());
    System.out.println(date.getDay());
    Calendar  cal=new GregorianCalendar();
    System.out.println(cal.get(Calendar.YEAR));
    Calendar cals = Calendar.getInstance();//获得当前时间
    cals.add(Calendar.DAY_OF_YEAR, -2);
    DateFormat fmt = 
        new SimpleDateFormat("yyyy-MM-dd");
      String str = fmt.format(cals.getTime());
      System.out.println(str); 
}

Answer 2

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis() - 1000 * 60 * 60 * 24 * 14);
System.out.println(sdf.format(cal.getTime())); Date d1 = new Date();
d1.setTime(System.currentTimeMillis() + 1000 * 60 * 60 * 24 * 14);
System.out.println(sdf.format(d1));

Answer 3

用joda-time吧，专门为了解决坑爹的java日期问题的

Answer 4

Calendar cal = Calendar.getInstance();
cal.set(Calendar.DATE, cal.get(Calendar.DATE) + 14);
cal.set(Calendar.DATE, cal.get(Calendar.DATE) - 14);

Answer 5

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
System.out.println("14天前:"+sdf.format(new Date().getTime()-(1000*60*60*24*14)));
System.out.println("14天后:"+sdf.format(new Date().getTime()+(1000*60*60*24*14)));

Answer 6

最好加个LSimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        System.out.println("14天前:"+sdf.format(new Date().getTime()-(1000*60*60*24*14l)));
        System.out.println("14天后:"+sdf.format(new Date().getTime()+(1000*60*60*24*14l)));