code: public static LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) {
          LocalDate date = LocalDate.of(year, month, dayOfMonth);
          LocalTime time = LocalTime.of(hour, minute, second);
          return new LocalDateTime(date, time);
      }
docs: Obtains an instance of {@code LocalDateTime} from year, month,
  day, hour, minute and second, setting the nanosecond to zero.
  <p>
  This returns a {@code LocalDateTime} with the specified year, month,
  day-of-month, hour, minute and second.
  The day must be valid for the year and month, otherwise an exception will be thrown.
  The nanosecond field will be set to zero.
  
  @param year  the year to represent, from MIN_YEAR to MAX_YEAR
  @param month  the month-of-year to represent, not null
  @param dayOfMonth  the day-of-month to represent, from 1 to 31
  @param hour  the hour-of-day to represent, from 0 to 23
  @param minute  the minute-of-hour to represent, from 0 to 59
  @param second  the second-of-minute to represent, from 0 to 59
  @return the local date-time, not null
  @throws DateTimeException if the value of any field is out of range,
  or if the day-of-month is invalid for the month-year