My cooker has a button with a picture of a clock underneath it. When I press it nothing happens, when I hold it nothing happens. The button does not appear to do anything.

To change the time on my oven you have to press a button with a picture of a key on it, wait for a red light to show up, then press the up and down keys to move left and right and the plus and minus keys to increase and decrease time. The bottom with the picture of the clock on it does not appear to be involved in the process at all.