In my pages I have cells receiving real time new info (equities quotations from the exchanges). I want to take such info in different cells according to different time spans. For example, I have a cell receiving the higher quotation for a stock during the day. I want to take such data at different time spans, a) 9:30 to 10:30, 10:30 to 11:30, and more. I do not want the cell to be modified after the time span have concluded. How to do it?