Sumproduct trouble

Dear ALL,
I am a Project Manager, Surveyor involved in new ships building. I have to control and report the budget and actual hours every month and at the end of the project. I need to calculate the sum of the actually spent hours for the inspections done every month and send them to our head office. I use SUMPRODUCT function but Excel displays #VALUE! error eventhough there are no cells used in the formula which contain text!
The formula in E11 = SUMPRODUCT(--(MONTH(E2:E8)=MONTH(E10)),--(YEAR(E2:E8)=YEAR(E10)),H2:H8)
E2:E8 and E10 are formated as a date. I tested all of them with ISNUMBER and the result is TRUE!!!
Could you advise please where is the mistake??? Is there other formula I can use for the intended purpose?
E F G H
1 DATE SURVEYOR BUDGET HOURS ACTUAL HOURS
2 20/11/2008 KL 2 1.5
3 3/10/2008 SSN 4 3.25
4 25/11/2008 JJO 1 1.5
5 9/12/2008 BMC 4 5.25
6 1/1/2009 KL 0.5 1
7 15/10/2008 KL 1 1
8 01/12/2009 JJK 2.5 1
9 Total Hours - 15.0 14.5
10 Oct-08 Nov-08 Dec-08 Jan-09
11 #VALUE! #VALUE! #VALUE! #VALUE!

Select E2:E8 and go to DATA|Text To Columns...

Skip to the 3rd dialogue and select Date from the column data format area and then pick DMY from the drop down next to it...

Click Finish.. does that fix it?

Can you post the workbook?