app/Date.php
public static function calendarNames(): array
    {
        return [
            /* I18N: The gregorian calendar */
            'gregorian' => I18N::translate('Gregorian'),
            /* I18N: The julian calendar */
            'julian'    => I18N::translate('Julian'),
            /* I18N: The French calendar */
            'french'    => I18N::translate('French'),
            /* I18N: The Hebrew/Jewish calendar */
            'jewish'    => I18N::translate('Jewish'),
            /* I18N: The Arabic/Hijri calendar */
            'hijri'     => I18N::translate('Hijri'),
            /* I18N: The Persian/Jalali calendar */
            'jalali'    => I18N::translate('Jalali'),
        ];
    }
public static function calendarNames(): array
    {
        return [
            /* I18N: The gregorian calendar */
            'gregorian' => I18N::translate('Gregorian'),
            /* I18N: The julian calendar */
            'julian'    => I18N::translate('Julian'),
            /* I18N: The French calendar */
            'french'    => I18N::translate('French'),
            /* I18N: The Hebrew/Jewish calendar */
            'jewish'    => I18N::translate('Jewish'),
            /* I18N: The Arabic/Hijri calendar */
            'hijri'     => I18N::translate('Hijri'),
            /* I18N: The Persian/Jalali calendar */
            'jalali'    => I18N::translate('Jalali'),
        ];
    }
public static function calendarNames ( ) : array { return [ /* I18N: The gregorian calendar */ 'gregorian' => I18N :: translate ( 'Gregorian' ) , /* I18N: The julian calendar */ 'julian' => I18N :: translate ( 'Julian' ) , /* I18N: The French calendar */ 'french' => I18N :: translate ( 'French' ) , /* I18N: The Hebrew/Jewish calendar */ 'jewish' => I18N :: translate ( 'Jewish' ) , /* I18N: The Arabic/Hijri calendar */ 'hijri' => I18N :: translate ( 'Hijri' ) , /* I18N: The Persian/Jalali calendar */ 'jalali' => I18N :: translate ( 'Jalali' ) , ] ; }
A list of supported calendars and their names.

@return string[]
A list of supported calendars and their names .