Conditional formatting - Fill colour and dates

First post here. Here goes:

I'm trying to reduce the amount of data I enter manually in an excel Parts List at work. I don't really have a clue how to code but what I'm trying to do in Excel might sound something like this in computer language (see attachment):

If Cell B3 & D3 = fill colour green then>
Value in Cell C3=Value in B3
and
D3=Todays Date (i.e. date I'm actually filling in the info)

Alternatively if I enter a date in D3 (any date, could be 04/04/1916)

If D3 = date entered then>
C3 & D3 = Fill Colour Green
and
Value in B3 = Value in C3.

Is it possible to do this in Conditional Formatting?