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I want to write a dax where the fiscal year starts from 31st December, for example, December 31st 2018 is actually starting of the fiscal year 2019?
Create a Date Table as a new Blank Query using this:
let fnDateTable = (StartDate as date, EndDate as date, FYStartMonth as number) as table => let DayCount = Duration.Days(Duration.From(EndDate - StartDate)), Source = List.Dates(StartDate,DayCount,#duration(1,0,0,0)), TableFromList = Table.FromList(Source, Splitter.SplitByNothing()), ChangedType = Table.TransformColumnTypes(TableFromList,{{"Column1", type date}}), RenamedColumns = Table.RenameColumns(ChangedType,{{"Column1", "Date"}}), InsertYear = Table.AddColumn(RenamedColumns, "Year", each Date.Year([Date]),type text), InsertYearNumber = Table.AddColumn(RenamedColumns, "YearNumber", each Date.Year([Date])), InsertQuarter = Table.AddColumn(InsertYear, "QuarterOfYear", each Date.QuarterOfYear([Date])), InsertMonth = Table.AddColumn(InsertQuarter, "MonthOfYear", each Date.Month([Date]), type text), InsertDay = Table.AddColumn(InsertMonth, "DayOfMonth", each Date.Day([Date])), InsertDayInt = Table.AddColumn(InsertDay, "DateInt", each [Year] * 10000 + [MonthOfYear] * 100 + [DayOfMonth]), InsertMonthName = Table.AddColumn(InsertDayInt, "MonthName", each Date.ToText([Date], "MMMM"), type text), InsertCalendarMonth = Table.AddColumn(InsertMonthName, "MonthInCalendar", each (try(Text.Range([MonthName],0,3)) otherwise [MonthName]) & " " & Number.ToText([Year])), InsertCalendarQtr = Table.AddColumn(InsertCalendarMonth, "QuarterInCalendar", each "Q" & Number.ToText([QuarterOfYear]) & " " & Number.ToText([Year])), InsertDayWeek = Table.AddColumn(InsertCalendarQtr, "DayInWeek", each Date.DayOfWeek([Date])), InsertDayName = Table.AddColumn(InsertDayWeek, "DayOfWeekName", each Date.ToText([Date], "dddd"), type text), InsertWeekEnding = Table.AddColumn(InsertDayName, "WeekEnding", each Date.EndOfWeek([Date]), type date), InsertWeekNumber= Table.AddColumn(InsertWeekEnding, "Week Number", each Date.WeekOfYear([Date])), InsertMonthnYear = Table.AddColumn(InsertWeekNumber,"MonthnYear", each [Year] * 10000 + [MonthOfYear] * 100), InsertQuarternYear = Table.AddColumn(InsertMonthnYear,"QuarternYear", each [Year] * 10000 + [QuarterOfYear] * 100), ChangedType1 = Table.TransformColumnTypes(InsertQuarternYear,{{"QuarternYear", Int64.Type},{"Week Number", Int64.Type},{"Year", type text},{"MonthnYear", Int64.Type}, {"DateInt", Int64.Type}, {"DayOfMonth", Int64.Type}, {"MonthOfYear", Int64.Type}, {"QuarterOfYear", Int64.Type}, {"MonthInCalendar", type text}, {"QuarterInCalendar", type text}, {"DayInWeek", Int64.Type}}), InsertShortYear = Table.AddColumn(ChangedType1, "ShortYear", each Text.End(Text.From([Year]), 2), type text), AddFY = Table.AddColumn(InsertShortYear, "FY", each "FY"&(if [MonthOfYear]>=FYStartMonth then Text.From(Number.From([ShortYear])+1) else [ShortYear])) in AddFY in fnDateTable
How can we implement this in our data model using SSDT?
You can create this as a Date dim table in Power BI and create a relationship with the date column in your fact table.
So bascially we are using direct query in our SSDT with the Azure analysis services and I dont think we have an option in the Powerbi to create external replationship, this all needs to be done in the model itself
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