app/Date/AbstractCalendarDate.php
protected function formatDayOfYear(): string
    {
        return I18N::digits($this->minimum_julian_day - $this->calendar->ymdToJd($this->year, 1, 1));
    }
protected function formatDayOfYear(): string
    {
        return I18N::digits($this->minimum_julian_day - $this->calendar->ymdToJd($this->year, 1, 1));
    }
protected function formatDayOfYear ( ) : string { return I18N :: digits ( $ this -> minimum_julian_day - $ this -> calendar -> ymdToJd ( $ this -> year , 1 , 1 ) ) ; }
Generate the %z format for a date.

@return string
Generate the %z format for a date .