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SUMPRODUCT(...ISNUMBER(...B4:B13)*1)

Count if the cell contains date

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. 


Used Functions

Category: Math and trigonometry

Returns the sum of the products of corresponding array components

Syntax

SUMPRODUCT(array1, [array2], [array3], ...)

Category: Information

Returns TRUE if the value is a number

Syntax

ISNUMBER(value)

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