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.
Category: Math and trigonometry
Returns the sum of the products of corresponding array components
SUMPRODUCT(array1, [array2], [array3], ...)
Category: Information
Returns TRUE if the value is a number
ISNUMBER(value)
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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.