How to Count Cells on A Day

The SUMPRODUCT function is to return the sum of the products of corresponding ranges or arrays. It can also count the cells in a certain yeara month, or a day. The following formula is to figure out the number of cells in a day (e.g., the ninth day in a month).

Example: You are working with a dataset with the first name in column A, the last name in column B, and the DOB (date of birth) in column C.

Formula 1: How many people were born on the second day of a month?

=SUMPRODUCT(–(DAY(C2:C12)=2))

  • Step 1: DAY(C2:C12)=2: if DOB is on the second, it returns true, otherwise false;
  • Step 2: The double hyphens (–) convert true into one and false into zero;
  • Step 3: The SUMPRODUCT returns the sum of the products of the array.

The result returns 3, so three people were born on the second day.

Formula 2: How many people were born on the 10th of a month?

=SUMPRODUCT(–(DAY(C2:C12)=10))

The result returns 2, so two people were born on the 10th.

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 add.
– Array2 is optional; the second array is to multiply and add.

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