I have a Brookstone clock that has 3 circles on the face, one for the day/date, one for the time and one for the temperature. There is no product number anywhere, but the clock lights up green, red and blue. On the back is a Mode Buttom, a Set Button, an up arrow a down arrow and a C/F (which I suppose is Celcius and Fahrenheidt. But I can't seem to be able to set the date or time. Can you help