Create Conditional Formatting Rules Using Formals that Refer to Date Values

Hi! New subscriber. What I'm looking the internet for is, how can I highlight a cell if the checkbox it's linked to is "False" after a certain date? If the context helps I have a table that has each month as a row, and each cell in that row has a review for an employee that's due in that month. (For example in the January row it may have 1 cell that has Sally, another cell that has John, etc.)

If Sally's review didn't get completed in January when it's due (the box is linked to a checkbox), then I want conditional formatting to highlight Sally's cell if the box isn't checked by February 1st.

I hope this makes sense!!