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20 December, 2019

Count dates in given year

Count dates in given year

Excel formula: Count dates in given year
Generic formula 
=SUMPRODUCT(--(YEAR(dates)=year))
Explanation 
To count dates in a given year, you can use the SUMPRODUCT and YEAR functions. In the example shown, the formula in E5 is:

=SUMPRODUCT(--(YEAR(dates)=D5))
where "dates" the a named range B5:B15.

How this formula works

The YEAR function extracts the year from a valid date. In this case, we are giving YEAR and array of dates in the named range "dates", so we get back an array of results:

{2018;2017;2019;2019;2017;2019;2017;2019;2019;2018;2018}
Each date is compared to the year value in column D, to produce an array or TRUE FALSE values:

{FALSE;TRUE;FALSE;FALSE;TRUE;FALSE;TRUE;FALSE;FALSE;FALSE;FALSE}
For the formula in E5, TRUE values are cases where dates are in the year 2017, and FALSE values represent dates in any other year.
Next, we use a double negative to coerce the TRUE FALSE values to 1's and 0's. Inside SUMPRODUCT, we now have:

=SUMPRODUCT({0;1;0;0;1;0;1;0;0;0;0})
Finally, with only one array to work with, SUMPRODUCT sums the items in the array and returns a result, 3.
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