I'm trying to use a variable in power query to save on adding same fuction twice but can't get it to work;

What i'm trying to replace is ; Date.QuarterOfYear ( 

   (A, B ) => 
let 
   Start = 
  List.Dates(A, (Number.From(B-A)+1), #duration(1,0,0,0) ),
  ToT = Table.FromColumns( { Start }  , { "Date"} ) ,
  FQ = Table.AddColumn( ToT, "Fiscal Q", each if Date.QuarterOfYear([Date]) =1 then 4 else Date.QuarterOfYear([Date])-1)
  
  in
   FQ
Which works

And I'd like to add Date.Quarter as a step and then use it; I've tried 



 (A, B ) => 
let 
   Start = 
  List.Dates(A, (Number.From(B-A)+1), #duration(1,0,0,0) ),
  ToT = Table.FromColumns( { Start }  , { "Date"} ) ,
  Quar = Date.QuarterOfYear([Date]) , 
  FQ = Table.AddColumn( ToT, "Fiscal Q", each if Quar = 1 then 4 else Quar -1 ) 
   in
   FQ
Not sure which part is wrong or if I need to declare the Quarter in a different way.


Richard