/**
* @param integer $dayOfMonth The day-of-month to check, validated as an integer.
* @param integer|null $monthOfYear An optional month-of-year to check against, fully validated.
* @param integer|null $year An optional year to check against, fully validated.
*
* @return void
*
* @throws DateTimeException If the day-of-month is not valid.
*/
public static function check($dayOfMonth, $monthOfYear = null, $year = null)
{
if ($dayOfMonth < 1 || $dayOfMonth > 31) {
throw DateTimeException::fieldNotInRange(self::NAME, $dayOfMonth, 1, 31);
}
if ($monthOfYear === null) {
return;
}
$monthLength = MonthOfYear::getLength($monthOfYear, $year);
if ($dayOfMonth > $monthLength) {
if ($dayOfMonth === 29) {
throw new DateTimeException("Invalid date February 29 as {$year} is not a leap year");
} else {
$monthName = MonthOfYear::getName($monthOfYear);
throw new DateTimeException("Invalid date {$monthName} {$dayOfMonth}");
}
}
}
/**
* Returns the length of the month represented by this date.
*
* @return integer The length of the month in days.
*/
public function getLengthOfMonth()
{
return Field\MonthOfYear::getLength($this->month, $this->year);
}
/**
* Returns a copy of this MonthDay with the month-of-year altered.
*
* If the day-of-month is invalid for the specified month, the day will
* be adjusted to the last valid day-of-month.
*
* @param integer $month
*
* @return MonthDay
*
* @throws DateTimeException If the month is invalid.
*/
public function withMonth($month)
{
$month = Cast::toInteger($month);
if ($month === $this->month) {
return $this;
}
Field\MonthOfYear::check($month);
$lastDay = Field\MonthOfYear::getLength($month);
return new MonthDay($month, $lastDay < $this->day ? $lastDay : $this->day);
}