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DAX のカレンダーはよく見かけますが、PowerQuery でカレンダーを作成しているのを見つけたので、自分用にアレンジして、備忘録として保存します。
引用元:All in One: Script to Create Date Dimension in Power BI using Power Query
※ はっきり言って [パクリ] なので、引用に問題がある場合は、ご指摘ください。
変更する場所は、以下 3 か所です。
FromYear ：開始年
ToYear ：終了年
StartofFiscalYear ：会計年度開始月
PowerQuery
PowerQuery
let
    // configurations start
    FromYear = 2015, // set the start year of the date dimension. dates start from 1st of January of this year
    ToYear = 2020, // set the end year of the date dimension. dates end at 31st of December of this year
    StartofFiscalYear=4, // set the month number that is start of the financial year. example; if fiscal year start is July, value is 7
    firstDayofWeek=Day.Monday, // set the week's start day, values: Day.Monday, Day, Sunday....
    // configuration end
    FromDate=#date(FromYear,1,1),
    ToDate=#date(ToYear,12,31),
    Source=List.Dates(
        FromDate,
        Duration.Days(ToDate-FromDate)+1,
        #duration(1,0,0,0)
    ),
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Renamed Columns" = Table.RenameColumns(#"Converted to Table",{{"Column1", "Date"}}),
    #"Changed Type" = Table.TransformColumnTypes(#"Renamed Columns",{{"Date", type date}}),
    #"Inserted Year" = Table.AddColumn(#"Changed Type", "Year", each Date.Year([Date]), Int64.Type),
    #"Inserted Start of Year" = Table.AddColumn(#"Inserted Year", "Start of Year", each Date.StartOfYear([Date]), type date),
    #"Inserted End of Year" = Table.AddColumn(#"Inserted Start of Year", "End of Year", each Date.EndOfYear([Date]), type date),
    #"Inserted Month" = Table.AddColumn(#"Inserted End of Year", "Month", each Date.Month([Date]), Int64.Type),
    #"Inserted Start of Month" = Table.AddColumn(#"Inserted Month", "Start of Month", each Date.StartOfMonth([Date]), type date),
    #"Inserted End of Month" = Table.AddColumn(#"Inserted Start of Month", "End of Month", each Date.EndOfMonth([Date]), type date),
    #"Inserted Days in Month" = Table.AddColumn(#"Inserted End of Month", "Days in Month", each Date.DaysInMonth([Date]), Int64.Type),
    #"Inserted Month Name" = Table.AddColumn(#"Inserted Days in Month", "Month Name", each Date.MonthName([Date]), type text),
    #"Inserted Quarter" = Table.AddColumn(#"Inserted Month Name", "Quarter", each Date.QuarterOfYear([Date]), Int64.Type),
    #"Inserted Start of Quarter" = Table.AddColumn(#"Inserted Quarter", "Start of Quarter", each Date.StartOfQuarter([Date]), type date),
    #"Inserted End of Quarter" = Table.AddColumn(#"Inserted Start of Quarter", "End of Quarter", each Date.EndOfQuarter([Date]), type date),
    #"Inserted Week of Year" = Table.AddColumn(#"Inserted End of Quarter", "Week of Year", each Date.WeekOfYear([Date],firstDayofWeek), Int64.Type),
    #"Inserted Week of Month" = Table.AddColumn(#"Inserted Week of Year", "Week of Month", each Date.WeekOfMonth([Date],firstDayofWeek), Int64.Type),
    #"Inserted Start of Week" = Table.AddColumn(#"Inserted Week of Month", "Start of Week", each Date.StartOfWeek([Date],firstDayofWeek), type date),
    #"Inserted End of Week" = Table.AddColumn(#"Inserted Start of Week", "End of Week", each Date.EndOfWeek([Date],firstDayofWeek), type date),
    FiscalMonthBaseIndex=13-StartofFiscalYear,
    adjustedFiscalMonthBaseIndex=if(FiscalMonthBaseIndex>=12 or FiscalMonthBaseIndex<0) then 0 else FiscalMonthBaseIndex,
    #"Added Custom" = Table.AddColumn(#"Inserted End of Week", "FiscalBaseDate", each Date.AddMonths([Date],adjustedFiscalMonthBaseIndex)),
    #"Changed Type1" = Table.TransformColumnTypes(#"Added Custom",{{"FiscalBaseDate", type date}}),
    #"Inserted Year1" = Table.AddColumn(#"Changed Type1", "Year.1", each Date.Year([FiscalBaseDate]), Int64.Type),
    #"Renamed Columns1" = Table.RenameColumns(#"Inserted Year1",{{"Year.1", "Fiscal Year"}}),
    #"Inserted Quarter1" = Table.AddColumn(#"Renamed Columns1", "Quarter.1", each Date.QuarterOfYear([FiscalBaseDate]), Int64.Type),
    #"Renamed Columns2" = Table.RenameColumns(#"Inserted Quarter1",{{"Quarter.1", "Fiscal Quarter"}}),
    #"Inserted Month1" = Table.AddColumn(#"Renamed Columns2", "Month.1", each Date.Month([FiscalBaseDate]), Int64.Type),
    #"Renamed Columns3" = Table.RenameColumns(#"Inserted Month1",{{"Month.1", "Fiscal Month"}}),
    #"Removed Columns" = Table.RemoveColumns(#"Renamed Columns3",{"FiscalBaseDate"}),
    #"名前が変更された列 " = Table.RenameColumns(#"Removed Columns",{{"Date", "日付"}, {"Year", "年"}, {"Start of Year", "年度開始日"}, {"End of Year", "年度終了日"}, 
                                                                  {"Month", "月"}, {"Start of Month", "月初"}, {"End of Month", "月末"}, {"Days in Month", "月末日"}, 
                                                                  {"Month Name", "月名"}, {"Quarter", "既定四半期"}, {"Start of Quarter", "四半期開始日"}, {"End of Quarter", "四半期終了日"}, 
                                                                  {"Week of Year", "週No"}, {"Week of Month", "月No"}, {"Start of Week", "週の開始日"}, {"End of Week", "週の終了日"}, 
                                                                  {"Fiscal Year", "会計年度"}, {"Fiscal Quarter", "会計四半期"}, {"Fiscal Month", "会計月"}})
in
    #"名前が変更された列 "