calculate the difference between two dates all in one cell

[happydz]

Hi guys
I need to calculate the difference between two dates (Days/Months/Years) all in one cell, I tried the formula as shown in the screenshot, but it faild.
I have microsoft office excel 2007
I tried every trick I found on youtube, but none of them worked
It would be very helpful if you create a completed template (excel sheet.xls) so that I will find it easier to edit the dates
thank you in advance

 

[happydz]

	A	B	C	D	E	F
1	04-05-2001	06-06-2015		14	1	2
2

<tbody>
</tbody>

 

[Fluff]

Which is correct.
What if you have the full formula in C1?