SUMPRODUCT(...)
Count if the cell contains date
Used Functions
Category: Math and trigonometry
Returns the sum of the products of corresponding array components
Syntax
SUMPRODUCT(array1, [array2], [array3], ...)
Practice SUMPRODUCT Formula at Sheetzoom
SUMPRODUCT formula at Microsoft helpCategory: Information
Returns TRUE if the value is a number
Syntax
ISNUMBER(value)
0
The formula we have used used ISNUMBER that cheeks if the cell contains a number (the date) and returns an array of TRUE and FALSE and multiplies it 1 and then sum up the array.