/**
* Returns a copy of this {@code LocalDateTime} with the month-of-year altered.
* <p>
* The time does not affect the calculation and will be the same in the result.
* If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param int $month the month-of-year to set in the result, from 1 (January) to 12 (December)
* @return LocalDateTime a {@code LocalDateTime} based on this date-time with the requested month, not null
* @throws DateTimeException if the month-of-year value is invalid
*/
public function withMonth($month)
{
return $this->_with($this->date->withMonth($month), $this->time);
}