There is a plant which gives aroma in the night; I do not know its name but I have seen it somewhere.
Are there any plants that give aroma day and night?
No - some plants produce their perfume when its dark and others during the day. Some produce the most intense perfume as dusk falls, but not after dark. I can't think of any single plant which produces perfume 24 hours a day, other than one I can't recall the name of which apparently stinks rather than being pleasantly scented - that one may stink all the time the flower is present, I'm not sure. There wouldn't really be any advantage in their doing it - those which produce their perfume after dark do so as a 'lure', if you like, to encourage night insects to visit, either for the plant to consume or simply for pollination - they've just evolved that way.