src/ZonedDateTime.php
public function plusDuration(Duration $duration) : ZonedDateTime
    {
        return ZonedDateTime::ofInstant($this->instant->plus($duration), $this->timeZone);
    }
public function plusDuration(Duration $duration) : ZonedDateTime
    {
        return ZonedDateTime::ofInstant($this->instant->plus($duration), $this->timeZone);
    }
public function plusDuration ( Duration $ duration ) : ZonedDateTime { return ZonedDateTime :: ofInstant ( $ this -> instant -> plus ( $ duration ) , $ this -> timeZone ) ; }
Returns a copy of this ZonedDateTime with the specified Duration added.

@param Duration $duration

@return ZonedDateTime
Returns a copy of this ZonedDateTime with the specified Duration added .