/*

현재날짜에서 Add day 구하는 함수

*/

public static String getAddDt(int day){
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     String currentDateandTime = sdf.format(new Date());
     Date date = new Date();
     Calendar cal = Calendar.getInstance();
     cal.setTime(date);
     cal.add(Calendar.DATE, day);
     String strDate = sdf.format(cal.getTime());
     return strDate;
}

AND