SUMPRODUCT error

surkdidat

Well-known Member
Joined
Oct 1, 2011
Messages
582
Office Version
  1. 365
Can anyone advise why the below formula seems to include all blanks, and how I get around this please? (It works fine for every other month!)
Code:
=SUMPRODUCT(1*(MONTH('Dev WIP'!$AC$2:$AC$1000)=1))
 

Excel Facts

What did Pito Salas invent?
Pito Salas, working for Lotus, popularized what would become to be pivot tables. It was released as Lotus Improv in 1989.

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