(PHP 5 >= 5.5.0, PHP 7)
DateTimeImmutable::setISODate — Sets the ISO date
public DateTimeImmutable::setISODate ( int $year , int $week [, int $dayOfWeek = 1 ] ) : DateTimeImmutable
Like DateTime::setISODate() but works with DateTimeImmutable.
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https://www.php.net/manual/en/datetimeimmutable.setisodate.php