I am using the below formula to generate a comment that displays when a report will expire. Because I added the text "This report will expire on" directly into the concatenate function arguments box it is constantly displayed. I want the cell to be blank if there is no date in the third party expiration!D13 cell.

=CONCATENATE("This report will expire on"," ",TEXT('Third Party Expiration'!D13,"mmmm d, yyyy"))

This formula is constantly displayed as "This report will expire on"
When there is a date in the D13 cell then an example display is "This report will expire on August 8, 2013"

When D13 contains no date- I do not want the words "this report will expire on" to show up. How can I alter this formula to have the cell left blank on a conditional basis.

Thanks!