Let's say, Right now, it is 30 past 12.
And someone asks me time and I tell him it's over 12
I want to say " it is time more than 12 o'clock
How do we say it in English.
I don't know what preposition has to be used?
I'd say the same as tunaafi and heypresto. I also sometimes say "It's gone twelve". (But usually when it's not more than about 15 or 20 minutes past the hour. From then on I would say "It's nearly half past".)