Just a question.
How can I obtain a String from

currentTime :: IO Day
currentTime = utctDay `fmap` getCurrentTime

Here currentTime returns to me 2010-06-24, but I want "2010-06-24".
In another worlds I need a function

I bet Day has a Show instance (that's why you get 2010-06-24 in ghci I suppose)
Just use that.

currentTimeStr :: IO Day -> String

Getting out of IO? I would think again. Following might be what you really want:

currentTimeStr :: IO Day -> IO String

Any Idea?

Luca.

Best,
Ozgur