Welcome to the Board!
Highlight your whole column that you want to apply this to, then add the following Conditional Formatting Rules, as they pertain to the first cell in your highlighted range (Excel will automatically adjust for all the other rows). So if the first cell in your range is A1, here is what those formulas will look like:
Code:
Rule 1: =$A1=""
Rule 2: =AND($A1 < TODAY()-1,$A1 > EDATE(TODAY(),-6))
Rule 3: =AND($A1 < EDATE(TODAY(),-6),$A1 > EDATE(TODAY(),-11))
Rule 4: =$A1 < EDATE(TODAY(),-11)
A few notes:
- Don't forget to choose the appropriate color formatting option for each rule.
- When you enter the Conditional Formatting Rules in, the newest rule added gets put at the top. So you either want to enter these rules in reverse order, or re-order them after you have entered them all (you can do that from the "Manage Rules" section).
- Note that you may need to "edit" the rules slightly, as you did not mention what should happen if it EXACTLY 6 months or 11 months. You will probably just need to change the appropriate
> to
>=, etc.