Do you have class here for 12:30

Do you have class here for 12:30
 

Outside the lecture theatre, a student wants to sit in, but he is not sure whether the lecture will be an exam, can he ask one of those students outside?

-Do you have class here for 12:30?
-Do you have class here at 12:30?

Using 'at' would be much more common, but both may be used.

Thank you.