Total values from date range table

I don't know where to start with this one.

I need to put a Start and End date range in the bottom fields so it will total the values that fall within that date range.

PHP Code: 

    October    November    December
1    1.5    0.0    0.0
2    2.7    0.0    2.0
3    0.0    0.0    2.0
4    0.0    3.4    1.8
5    0.0    3.6    0.0
6    3.5    1.8    0.0
7    7.0    1.5    0.0
8    3.9    0.0    0.0
9    3.6    0.0    0.0
10    2.0    0.0    1.0
11    0.0    0.0    1.6
12    0.0    0.0    0.0
13    0.0    0.0    0.0
14    3.9    1.5    0.0
15    1.3    0.0    0.0
16    3.8    0.0    0.0
17    2.0    0.0    0.0
18    0.0    0.0    0.0
19    0.0    0.0    0.0
20    3.8    0.0    0.0
21    1.8    0.0    0.0
22    1.5    0.0    0.0
23    0.0    0.0    0.0
24    2.0    0.0    0.0
25    0.0    1.7    0.0
26    0.0    0.0    0.0
27    2.3    0.0    0.0
28    3.3    0.0    0.0
29    0.0    0.0    0.0
30    0.0    0.0    1.2
31    0.0        0.0
Total Hours    49.9    13.5    9.6
Start Date    1-Oct-08                 7-Nov-08    1-Dec-08
End Date     6-Nov-08     30-Nov-08    29-Dec-09
          Total Here            Total Here            Total Here 


As you can see with the Oct-Nov range, they can overlap months, so simply summing the column of the appropriate month won't work.

Sorry for the formatting of this post, not much time at work to submit properly.

Thanks for the help.

To best describe or illustrate your problem you would be better off attaching a dummy workbook, the workbook should contain the same structure and some dummy data of the same type as the type you have in your real workbook - so, if a cell contains numbers & letters in this format abc-123 then that should be reflected in the dummy workbook.

If needed supply a before and after sheet in the workbook so the person helping you can see what you are trying to achieve.

In short we can guess the references but it would be easier if you posted a file I think...


I think what you're trying to do will prove pretty inefficient using native formulae - a UDF may be preferable - are you able to utilise VBA ?

one cheat - VBA less way of doing this without things becoming too horrendous...

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this creates a date value for each value in your matrix allowing you to use a standard SUMIF which is pretty efficient, eg:

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