src/ZonedDateTime.php
public function plusDays(int $days) : ZonedDateTime
    {
        return ZonedDateTime::of($this->localDateTime->plusDays($days), $this->timeZone);
    }
public function plusDays(int $days) : ZonedDateTime
    {
        return ZonedDateTime::of($this->localDateTime->plusDays($days), $this->timeZone);
    }
public function plusDays ( int $ days ) : ZonedDateTime { return ZonedDateTime :: of ( $ this -> localDateTime -> plusDays ( $ days ) , $ this -> timeZone ) ; }
Returns a copy of this ZonedDateTime with the specified period in days added.

@param int $days

@return ZonedDateTime
Returns a copy of this ZonedDateTime with the specified period in days added .