Where a cell has an event I don't wish to do anything 

Where a cell doesn't have an event  I want to set the cell background color to a specific color determined by the time of the cell, ie: its position in the time scale.

 

Lets say I have an appointment at 0900: No prob I set the event colour to whatever.

at 0930 I dont have any appointments so I want to set the cell backgroung colour to say purple. This would be the default color for 0930 where there is no appointment (event).

 

at 1030 I don't have an appointment also, but now I want to set the cell color to green. The default color for 1030 where there is no appointment (event).

 

Any Ideas anyone?

 

Thanks

Mk