Date data in M code for DAX

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    Keivan Work

    The code creates a table called "fnDateTable" that contains the following columns:

    StartDate EndDate FYStartMonth

    The code first parses the StartDate and EndDate values into dates using the DateTimeSerializer. From these dates, it creates a Duration object that represents the amount of time between the two dates.

    Next, it creates a List of Dates from the StartDate and EndDate values. It uses the Splitter object to split the list into two pieces, one containing the dates from the StartDate to the first day of the month, and the other containing the dates from the StartDate to the last day of the month.

    The code then creates a table called "TableFromList" from the List of Dates. It uses the Table object's FromList method to create the table.

    The code then converts the types of the columns in TableFromList to the types that the table fnDateTable will have. This is done with the Table.TransformColumnTypes method.

    The code then renames the columns in TableFromList to reflect the new column names.

    The code then adds the following columns to the table:

    Year YearNumber Month Day

    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
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