To count the number of cells that contain dates between two dates, you can use the COUNTIFS function.
In the example shown, F5 contains this formula:
This formula counts birthdays in the year 2000, that appear in the range C5:C11.
How the formula works
The COUNTIFS function is built to count cells that meet multiple criteria. In this case, we need to provide two criteria: one criteria for the earlier date and one for the later date. We supply the named range dates (C5:C11) for both criteria.
To construct each date, we use the DATE function:
The DATE function makes it easy to build dates based on year, month, and day arguments that are either hard-coded or supplied as cell references. In the example, month and day are hard-coded, and we get year from column E.
Note that >= and <= must be entered as text and surrounded by double quotes. This means we must use concatenation (&) to join each operator to each date.