Greece does a particularly useful practice of notaming the airport opening hours, and this information is accurate.
I guess, this is the result of their AIP being not online (till very recently) and thus being read by practically nobody.
It would be a pity to lose this, because AIPs are very variable in their accuracy. So variable that I almost never look at any nowadays (probably true for most pilots 
) and always contact the airport(s) directly.
