public static function getShortDay($day): string
	{
		if ($day instanceof DateTimeInterface) {
			$day = (int) $day->format('N');
		}
		if (!is_int($day)) {
			throw new InvalidArgumentException;
		}
		return self::$dayNamesShort[self::$locale][$day];
	}
public static function getShortDay($day): string
	{
		if ($day instanceof DateTimeInterface) {
			$day = (int) $day->format('N');
		}
		if (!is_int($day)) {
			throw new InvalidArgumentException;
		}
		return self::$dayNamesShort[self::$locale][$day];
	}
public static function getShortDay ( $ day ) : string { if ( $ day instanceof DateTimeInterface ) { $ day = ( int ) $ day -> format ( 'N' ) ; } if ( ! is_int ( $ day ) ) { throw new InvalidArgumentException ; } return self :: $ dayNamesShort [ self :: $ locale ] [ $ day ] ; }
Vrati zkraceny nazev dne
@param int|DateTimeInterface $day
@return string
Vrati zkraceny nazev dne