I can logg in into Psn but when I click the psn store it says it is going under Maintainance,why
Because it's being maintained.
If you know where to look (e.g. the forums) these things are usually advertised in advance.
This one is due to last until midnight (GMT).
IS ps store open at midnight?!?! someone please answer, i read a tweet from playstation saying 4.pm what is this? mabye i miss read