I have a spreadsheet with all of our clients and the services we deliver to
each client. I have it all set up with dates, conditional formatting, IF
functions, point values, etc.

When we get a new client and add them to the spreadsheet, it adds cells for
all of the services that we WILL deliver to the client. If, after a certain
amount of time, depending on the service, the service is not delivered to the
client, it becomes overdue.

I want to see if there is a way to turn the cell red if no data has been
entered into the cell after a month (31 days).

Any suggestions?