=SUMIF(L2:L145,"=02/08/09",D2:D145)+SUMIF(K2:K145,"=02/08/09",D2:D145)+SUMIF(J2:J145,"=02/08/09",D2:D145)+SUMIF(I2:I145,"=02/08/09",D2:D145)+SUMIF(H2:H145,"=02/08/09",D2:D145)+SUMIF(G2:G145,"=02/08/09",D2:D145)+SUMIF(F2:F145,"=02/08/09",D2:D145)+SUMIF(E2:E145,"=02/08/09",D2:D145)

Q1: The number is what I what to get from above function. I wonder if there
is another way to make above function work in a simpler form.

Q2: If I want to add all values in column D whick have a date in the cell
range from E2:P145 within a certain month, how can I correct date from
,"=02/08/09" in to a month range, for instance, in the August month?