문자열을 날짜로 변환 String str_day = "2023-06-30 11:45:00"; SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date d_day = fmt.parse(str_day); 날짜를 문자열로 변환 Date d_day = new Date(); SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String str_day = fmt.format(d_day);