Quick Excel Formula Help Pls!

I am doing a spreadsheet and thought I would be able to work this out easily but not the case:

I need a formula that tells me the days between two dates eg.

04 Nov 07 - 04 Dec 09 = 1416 Days

Now I just did a + formula between the dates and got 78887 so god knows what that represents.

Can anyone help???

:)
 
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