# How to Sum Numbers in A Month and Year

The SUMPRODUCT function is to return the sum of the products of corresponding ranges or arrays. It can sum the numbers in a certain year, a month, or a day. The following example is to sum numbers in a month and year, e.g., November 1994.

Example: You are working with a dataset with the product name in column A, the date sold in column B, and the amount sold in column C.

Formula 1: To count the total number of products sold in June 1993

=SUMPRODUCT( --(YEAR(B2:B12)=1993),--(MONTH(B2:B12)=6),C2:C12)

(YEAR(B2:B12)=1993): if the year is 1993, it returns true, otherwise false;
(MONTH(B2:B12)=6): if the month is June, it returns true, otherwise false;
The double hyphens (--) convert true into 1, and false into 0;
The SUMPRODUCT returns the sum of the products of the array.

The result returns 2,935, and 2,935 products were sold in June 1993.

Formula 2: To count the total number of products sold in November 1994

=SUMPRODUCT( --(YEAR(B2:B12)=1994), --(MONTH(B2:B12)=11),C2:C12)

The result returns 2,561, and 2,561 products were sold in November 1994.

Notes: The SUMPRODUCT function

The SUMPRODUCT function adds all the multiplication results for all arrays.

Formula:

=SUMPRODUCT(array1, [array2], …)

Explanations:

– Array1 is required, the first array is to multiply and then add.
– Array2 is optional, the second array is to multiply and then add.