(PHP 5 >= 5.5.0, PHP 7)
DateTimeImmutable::setDate — Sets the date
public DateTimeImmutable::setDate ( int $year , int $month , int $day ) : DateTimeImmutable
Like DateTime::setDate() but works with DateTimeImmutable.
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https://www.php.net/manual/en/datetimeimmutable.setdate.php