I think you should ask about the exact date to make sure, but usually it refers to "5월말(5월 31일)"까지. ^______^

네... 그렇죠??!! ;-)

@Gloups & hiro - 일본인들도 한국인처럼? "~까지" 라는 뜻으로 "まで(made)" 을 많이 사용하는 걸로 알고 있습니다 like "6まで送っ下さい"^^ @Gloups - not at all, asking for confirmation isn't our thing.^^ hahaha...

@hiro: 코맨트 고마워요. 맞은 거 같아요 ;-) 그럼 일본어로 '6ji made'라고 (6ji ni 란 뜻으로) 말하면 좀 이상하겠죠? @Pascal: It s funny then if one always has to ask for confirmation. Could it be a feature of Korean conversation?? A kind of rule such as "Dont be precise when u give first a piece of information, so that ur partner can ask for confirmation"?? I m kidding but... still... (",)

somebody says "까지", especially when it comes to months, I always ask the exact date to confirm.^^