getid3_id3v2::IsValidDateStampString( string $datestamp ): bool

3771	public static function IsValidDateStampString($datestamp) {3772		if (!preg_match('#^[12][0-9]{3}[01][0-9][0123][0-9]$#', $datestamp)) {3773			return false;3774		}3775		$year  = substr($datestamp, 0, 4);3776		$month = substr($datestamp, 4, 2);3777		$day   = substr($datestamp, 6, 2);3778		if (($year == 0) || ($month == 0) || ($day == 0)) {3779			return false;3780		}3781		if ($month > 12) {3782			return false;3783		}3784		if ($day > 31) {3785			return false;3786		}3787		if (($day > 30) && (($month == 4) || ($month == 6) || ($month == 9) || ($month == 11))) {3788			return false;3789		}3790		if (($day > 29) && ($month == 2)) {3791			return false;3792		}3793		return true;3794	}