Format cells to change colour by date?

Looking for some assistance on cell (conditional ) formatting.
I have a sheet with a date column (in no order as sheet in name order) and would like to show these dates in red/amber/green depending on period, i.e. 9 to 12 months and over =red, 6 to 9 months amber and 6 months and under=green.

Have looked at the conditional formatting but can't seem to get it completely right, any help appreciated.

Thanks

Thanks, works a treat.

Thanks for the help and have a good new year.