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

@param int $years

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