Hi, I want to sum numbers in column B if corresponding date in column A is between Jan and Mar. For example in the following table, the formula should sum Jan line and Feb line and the result would be 12 + 55 = 67. A B ----------- ------------------ 24-Jan-06 12 19-May-06 78 13-Dec-06 40 01-Jun-06 32 07-Feb-06 55 Thanks,