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I want to compare sales of Jan 2020 with Jan 2019 day by day but I want the same weekday for example 1/1/2020 Wednesday with 2/1/2019 which is also Wednesday. My master calendar has all the basic flags but I cant find the proper way to do it.
This should calculate the nearst weekday the previous year:
If the field that contains the date of the current year is called aDate:
Date(AddMonths(aDate,-12) + If(Mod(Year(aDate)-1,4)=0 AND Mod(Year(aDate)-1,100)<>0 OR Mod(Year(aDate)-1,400)=0 ,2,1 ))
If you have a field for the year corresponding to the year in aDate:
Date(AddMonths(aDate,-12) + If(Mod(aYear-1,4)=0 AND Mod(aYear-1,100)<>0 OR Mod(aYear-1,400)=0 ,2,1 ))