app/Date/AbstractCalendarDate.php
protected function formatLongMonth($case = 'NOMINATIVE'): string
    {
        switch ($case) {
            case 'GENITIVE':
                return $this->monthNameGenitiveCase($this->month, $this->isLeapYear());
            case 'NOMINATIVE':
                return $this->monthNameNominativeCase($this->month, $this->isLeapYear());
            case 'LOCATIVE':
                return $this->monthNameLocativeCase($this->month, $this->isLeapYear());
            case 'INSTRUMENTAL':
                return $this->monthNameInstrumentalCase($this->month, $this->isLeapYear());
            default:
                throw new InvalidArgumentException($case);
        }
    }
protected function formatLongMonth($case = 'NOMINATIVE'): string
    {
        switch ($case) {
            case 'GENITIVE':
                return $this->monthNameGenitiveCase($this->month, $this->isLeapYear());
            case 'NOMINATIVE':
                return $this->monthNameNominativeCase($this->month, $this->isLeapYear());
            case 'LOCATIVE':
                return $this->monthNameLocativeCase($this->month, $this->isLeapYear());
            case 'INSTRUMENTAL':
                return $this->monthNameInstrumentalCase($this->month, $this->isLeapYear());
            default:
                throw new InvalidArgumentException($case);
        }
    }
protected function formatLongMonth ( $ case = 'NOMINATIVE' ) : string { switch ( $ case ) { case 'GENITIVE' : return $ this -> monthNameGenitiveCase ( $ this -> month , $ this -> isLeapYear ( ) ) ; case 'NOMINATIVE' : return $ this -> monthNameNominativeCase ( $ this -> month , $ this -> isLeapYear ( ) ) ; case 'LOCATIVE' : return $ this -> monthNameLocativeCase ( $ this -> month , $ this -> isLeapYear ( ) ) ; case 'INSTRUMENTAL' : return $ this -> monthNameInstrumentalCase ( $ this -> month , $ this -> isLeapYear ( ) ) ; default : throw new InvalidArgumentException ( $ case ) ; } }
Generate the %F format for a date.

@param string $case Which grammatical case shall we use

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