Unable to make a cell change colour depending on another cells date.

Hello, I will try to explain this clearly.

I am having an issue with a formula.

I would like a cell to turn from green to red if a date in different cells goes beyond todays date.

For example, if the date in a cell isn't changed to todays date or a date in the future, a separate cell turns from green to red.

Does anyone have any tips?

Kind Regards Robert.