Vba Code Recording Dde Linked Data

In A2 is the Stock price, and B2 the time of the update.Now every time it updates A2 and B2 get overwritten.I need some code that will save/ record the the stock price on the hour, every hour. I then need the highest and the lowest price within that hour, and lastly the price at the very end of that hour. (example)

A.........B.................C.........D.........E...........F..........G
stock...time.............time......open....high.......low.......Close
.60......16:45:33......14:00....40........90.........30........60
............................15:00....65........78.........65........62
............................16:00....62........72.........58........58

I received what I think may work, but I dont know how to write this in VBA. If the time of the new value received > than B2 + 1 second, create new row where Open=High=Low=Close else if (last column=new value,if new value>high column then high column=new value,if new value<low coulmn then low column=new value.)