« DateTimeImmutable::__set_state DateTimeImmutable::setISODate » PHP Manual DateTimeImmutable Sets the date DateTimeImmutable::setDate (PHP 5 >= 5.5.0, PHP 7) DateTimeImmutable::setDate — Sets the date 说明 public DateTimeImmutable::setDate ( int $year , int $month , int $day ) : DateTimeImmutable Like DateTime::setDate() but works with DateTimeImmutable.