Java 日期加減

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public static void main(String[] args) {
   String DATE_FORMAT = "yyyy-MM-dd";
   java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(
     DATE_FORMAT);
   Calendar c1 = Calendar.getInstance();
   c1.set(1999, 0, 14);
   System.out.println("Date    is    :    " + sdf.format(c1.getTime()));
   c1.add(Calendar.DATE, 366);
   System.out.println("Date    +    366    days    is    :    "
     + sdf.format(c1.getTime()));
   System.out.println("----------------------------");

   c1.set(1999, 0, 31);
   System.out.println("Date    is    :    " + sdf.format(c1.getTime()));
   c1.roll(Calendar.MONTH, false); // 月份减去一个月，true 为加一个月，年、日不动
   System.out.println("Date    roll    down    1    month    :    "
     + sdf.format(c1.getTime()));

   c1.set(1999, 2, 31);
   System.out.println("Date    is    :    " + sdf.format(c1.getTime()));
   c1.add(Calendar.MONTH, -1); // 月份减去一个月
   System.out.println("Date    minus    1    month    :    "
     + sdf.format(c1.getTime()));
}