public static String getStringTime(String date, String time, int days) {
    String timeStr = date.substring(0, 10) + time.substring(10, 19);

    if (0 == days) {
      return timeStr;
    } else {
      // 字符串转Date
      SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
      try {
        java.util.Date timeDate = dfs.parse(timeStr);
        // 在原有日期上加上days
        java.util.Date newDate = DateUtil.addDateOneDay(timeDate, days);
        timeStr = dfs.format(newDate);
      } catch (ParseException e) {
        e.printStackTrace();
      }
      return timeStr;
    }
  }