joda-time的一个DEMO

Date activeDate = person.getActiveTime();
if(activeDate==null){
　　modelMap.put("expireDate","待定" );
}else{
　　SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
　　String time = sdf.format(activeDate);
　　DateTime dateTime = DateTime.parse(time);
　　DateTime expireDate =dateTime.plusYears(1);
　　modelMap.put("expireDate",expireDate.toString().substring(0, 10) );
}