In the following I work with the format dd-mm-yyyy
With 02-09-2015 in A1 and
05-05-2016 in A2
then in A3 try to enter
=A2-A1 which I think returns 02-09-1900.
Now try to format cell A3 General. and you should get the number 246 which is the number of days from 02-09-2015 to 05-05-2016.
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