change colour - conditional formatting

[stuee]

Ok ill try not to loose you.

I have a layout "List" this shows tasks to do as Y which is setup from another layout in a job setup.

On the job setup layout where the person pick Y this part of the job needs to be done, when the person does they choose their name and it auto fills the time / date in another field. 

What i want is this List showing the Y to be green, but if the person has done this part of the job and the timedate is in the compledate field then the y changes to a different colour like yellow.

they are all in the same table too.

Im hoping someone can give me help how to perform this.

 

Thanks