I have conditional formatting already set to shade a row differently for 3
conditions.  But I also need to have a date cell's value change to red if
it's manually changed.

I'm wondering if there's a way to use Excel's custom number format feature
to do this?

Here's the layout:
G - Submission Date (manually entered)
H - Hidden Workdays field to determine a 3 day Due Date date based on G
I -  Displayed Due Date field that equals value of H
J -  Hidden # Days Turnaround Field in General format (currently equals I -
G but can change that to H-G if I need to do that to make this work)

I want to have I's value display in RED if J<3 (or since they'd have to
manually change the displayed date, not sure if it's possible (or desirable)
to have the RED formatting dependant on the field being manually changed?).

Since I don't need to use I's value for calculations (can use H instead if
needed), can I use a custom number format that changes the manually entered
date to RED (I would be okay with it changing the format from mm/dd/yy to
mm-dd-yy if that was the only way to achieve the result -or even changing it
to text if needed).

If so ... what code do I need to do this?  

Don't know if I would need to have the cell stay as a date field unless it's
changed & then apply the custom format that changes it to whatever works for
this? Or if it can all have the custom format and still look like the other
dates (mm/dd/yy).

The more I think about it, the more confused I get but I can't help thinking
it may be possible.  I'm clearly in over my head here so I'd appreciate any
help anyone can give me with this.

Thank you all!