Sorry it's not working for you, but I believe it should work. I'm sure there
are better ways of explaining this than I have done.
Try this if you want to pursue this further.
A B
C
1 Type 12/31/07 then enter
2 Type 3/31/07 then enter
3 Type =A1-A2+1 then enter
Select cells A1 and A2 and right click.
Select Format Cells.
Click on Number tab.
Select Date.
In the Type box, select 3/14/01 and click OK.
Right click cell A3.
In Number tab, select General and click OK.
You should see something like the sample spreadsheet below.
A B C
1 12/31/07
2 3/31/07
3 276
OPTIONAL:
In cell B1, type = then point to A1 and hit Enter.
In cell B2, type = then point to A2 and hit Enter.
Copy the formula in cell A3 to cell B3.
Select cells B1 to B3 and right click.
In Number tab, select General and click OK.
You should see something like the sample spreadsheet below.
This shows that 39447 is the numerical equivalent of Dec 31, 2007 and 39172
is the numerical equivalent of Mar 31, 2007.
A B C
1 12/31/07 39447
2 3/31/07 39172
3 276 276
I hope the extra information does not confuse you. Personally, I find it
good to know why I can do math with Excel dates.