Conditional sums

[GTIGUY]

I want to create a formula that adds up numbers from one column that if the
value in a different column, same row is a certain value. As an example, if
column A has months and column B has numeric values, I want to add the values
for a certain month. The key is that the months in column A are repeating.
I may have 15 entries of January in Column A and I want to add the values
from Column B that have a corresponding entry in Column A of January. Any
advice on how to do this?

Thanks in advance.

 

[Max]

Assuming you have real dates in col A, values to be summed in col B
In say, C1:
=SUMPRODUCT(--(TEXT(A2:A100,"mmmyy")="Jan08"),B2:B100)
will return the total for all dates in Jan 2008