app/Date/AbstractCalendarDate.php
protected function formatMonthZeros(): string
    {
        if ($this->month > 9) {
            return I18N::digits($this->month);
        }

        return I18N::digits('0' . $this->month);
    }
protected function formatMonthZeros(): string
    {
        if ($this->month > 9) {
            return I18N::digits($this->month);
        }

        return I18N::digits('0' . $this->month);
    }
protected function formatMonthZeros ( ) : string { if ( $ this -> month > 9 ) { return I18N :: digits ( $ this -> month ) ; } return I18N :: digits ( '0' . $ this -> month ) ; }
Generate the %m format for a date.

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