What does it mean that Martin Luther king day will affect hours? Is it open to 9:30 or not?

Hours are regular hours no change.

Why don't you just call the store you want to visit?

It means that some Stores COULD close early not all

Yuppity duuuppp

Google to be on a safer side, in ALL bank/National holidays says 'Hours may be affected '. It may/may not be true but it's always a better idea to check.

As far as I know, it's still open until 9:30 pm.