code: public LocalDateTime atTime(int hour, int minute, int second) {
          return atTime(LocalTime.of(hour, minute, second));
      }
docs: Combines this date with a time to create a {@code LocalDateTime}.
  <p>
  This returns a {@code LocalDateTime} formed from this date at the
  specified hour, minute and second.
  The nanosecond field will be set to zero.
  The individual time fields must be within their valid range.
  All possible combinations of date and time are valid.
  
  @param hour  the hour-of-day to use, from 0 to 23
  @param minute  the minute-of-hour to use, from 0 to 59
  @param second  the second-of-minute to represent, from 0 to 59
  @return the local date-time formed from this date and the specified time, not null
  @throws DateTimeException if the value of any field is out of range