I don't see any functions in the Excel file you attached.
But, if you are looking to find the Quarter for a given date, you could use the 'Choose' and 'Month' functions:
=CHOOSE(MONTH(Cell_With_Date_Value),"Q1","Q1","Q1","Q2","Q2","Q2","Q3","Q3","Q3","Q4","Q4","Q4")
Basically, that would assign a value like Q1 to any date from Jan,Feb,Mar etc. Could add a column for quarter and then use that in your function somehow?
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