znalazłem działającą klasę do odczytywania daty urodzenia z nr pesel, ale format daty mam:dd-m-rrrr a chciałbym mieć w miesiący poprzedzające 0 np.21-03-2018. jak to zrobić? nie widzę miejsca w kodzie gdzie mógłbym to poprawić:

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<?php
class Pesel 
{
	/**
	 * String containing polish national identification number.
	 * 
	 * @var string
	 */
	protected $peselString;
 
	/**
	 * Day of birth.
	 * 
	 * @var int
	 */
	protected $dayOfBirth;
 
	/**
	 * Month of birth.
	 * 
	 * @var int
	 */
	protected $monthOfBirth;
 
	/**
	 * Year of birth.
	 * 
	 * @var int
	 */
	protected $yearOfBirth;
 
	/**
	 * Sex.
	 * 
	 * 0 = male, 1 = female
	 * 
	 * @var int
	 */
	protected $sex;
 
	/**
	 * Creates PESEL object and validates it's contents.
	 * 
	 * @param string $peselString String containing elevel digits of the PESEL number.
	 * @return Pesel
	 */
	public function __construct($peselString) {
		$this->peselString = $peselString;
		$this->validate();		
	}
 
	/**
	 * Validates PESEL number;
	 *
	 * @return void 
	 */
	protected function validate() {
		if(!preg_match('~^[\d]{11}$~', $this->peselString)) {
			throw new Exception('pesel powinien zawierać 11 znaków');
		}		
		$this->sex = (int)(substr($this->peselString, 9, 1) % 2 === 0);
		$this->dayOfBirth = (int)substr($this->peselString, 4, 2);
		$this->monthOfBirth = (int)substr($this->peselString, 2, 2);
		$century = 1900;
		if($this->monthOfBirth > 12) {
			switch($this->monthOfBirth[0]) {
				case 2:
				case 3:
					$century = 2000;
					$this->monthOfBirth -= 20;
					break;
				case 4:
				case 5:
					$century = 2100;
					$this->monthOfBirth -= 40;
					break;
				case 6:
				case 7:
					$century = 2200;
					$this->monthOfBirth -= 60;
					break;
				case 8:
				case 9:
					$century = 1800;
					$this->monthOfBirth -= 80;
					break;
				default:
					break;
			}
		}
 
		if($this->monthOfBirth == 0 || $this->monthOfBirth > 12) {
			throw new Exception('nieprawidłowa data urodzenia');
		}		
 
		$this->yearOfBirth = ((int)substr($this->peselString, 0, 2)) + $century;
 
		if(!checkdate($this->monthOfBirth, $this->dayOfBirth, $this->yearOfBirth)) {
			throw new Exception('nieprawidłowa data urodzenia');
		}
 
		$p = $this->peselString;
		$crc = 
			1 * $p[0] + 
			3 * $p[1] +
			7 * $p[2] +
			9 * $p[3] +
			1 * $p[4] +
			3 * $p[5] +
			7 * $p[6] +
			9 * $p[7] +
			1 * $p[8] +
			3 * $p[9];
		$crc = 10 - ((int) substr($crc, -1));			
		if($crc != $p[10]) {
			throw new Exception('nieprawidłowa suma kontrolna');
		}
	}
 
	/**
	 * Returns calculated year of birth.
	 * 
	 * @return int Day of birth. 
	 */	
	public function getYearOfBirth() {
		return $this->yearOfBirth;
	}
 
	/**
	 * Returns calculated month of birth.
	 * 
	 * @return int Month of birth. 
	 */	
	public function getMonthOfBirth() {
		return $this->monthOfBirth;
	}
 
	/**
	 * Returns calculated day of birth.
	 * 
	 * @return int Day of birth. 
	 */
	public function getDayOfBirth() {
		return $this->dayOfBirth;
	}
 
	/**
	 * Checks if given person is male.
	 * 
	 * @return bool True if male, false otherwise. 
	 */	
	public function isMale() {
		return $this->sex === 0;
	}
 
	/**
	 * Checks if given person is female.
	 * 
	 * @return bool True if female, false otherwise. 
	 */
	public function isFemale() {
		return $this->sex === 1;		
	}
 
	/**
	 * Returns PESEL number.
	 *
	 * @return string PESEL number. 
	 */
	public function getPesel() {
		return $this->peselString;
	}
}
 
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Skorzystaj z funkcji:

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$month = 3
echo str_pad($month, 2, '0', STR_PAD_LEFT); //03
$month = 12
echo str_pad($month, 2, '0', STR_PAD_LEFT); //12
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Ja bym chyba dodał jeszcze 1 metodę do tego:

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    public function getBirthDate($format = 'd-m-Y')
    {
        return (new DateTime())
            ->setDate(
                $this->yearOfBirth,
                $this->monthOfBirth,
                $this->dayOfBirth
            )
            ->format($format);
    }
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