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

@param int $hours

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