don't calculate if no date is entered

From: Mike <Mike_at_discussions.microsoft.com>
Date: Sat, 1 Jul 2006 05:54:01 -0700

I need to calculate days passed up to today, using the formula DAYS360(D2,TODAY()) which works great. However, in a row where a date has not been entered yet the formula returns 38314, which I assume is calculating from Jan 1900. What can I do to get Excel to just display 0 if no date is enetered yet?

ex. of worksheet   

    |  A           |    B               |          C               |         
      D                    |


________________________________________________________________

1 |DAYS OUT  |    NAME        |     DVD TITLE       | DATE CHECKED OUT       |


________________________________________________________________

2 |20              | John Doe      |     Chicken Little   |    Wed, Apr 20, 
2006      |


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3  |38314       |                     |                           |          
                           |


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Thanks......... Received on Sat Jul 01 2006 - 05:54:01 PDT