Sets the ISO date

DateTimeImmutable::setDate
DateTimeImmutable::setTime
DateTimeImmutable
PHP Manual

# DateTimeImmutable::setISODate

(PHP 5 >= 5.5.0)

DateTimeImmutable::setISODate — Sets the ISO date

### Description

public DateTimeImmutable DateTimeImmutable::setISODate ( int `$year` , int `$week` [, int `$day` = 1 ] )

Like DateTime::setISODate() but works with DateTimeImmutable.

DateTimeImmutable::setDate
DateTimeImmutable::setTime
DateTimeImmutable
PHP Manual