Hi All,
I followed the guidelines for importing a CSV file and preparing it on Google Drive. I then inserted the formula for calculating month and got a REF error
=arrayformula(if(row($A1:$A)=1,“Month”,iferror(date(year($A1:$A),month($A1:$A),1))))
Below is the layout of the file. The formula used is exactly like the one from Tiller and pasted above.