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Put the initial date you want in the first cell and then use a formula to add 15 to that date in subsequent cells. So for example, in A1 you could type:

01/01/09

In A2 type:

=A1+15

That will give you 16/01/09 in the A2. Then copy the formula down and it will keep on adding 15 days to the previous date.

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15y ago

What else can I help you with?