z = Table.AddColumn( #"Добавлен пользовательский объект", "Custom11", each Json.Document( Web.Contents( [Custom] ) ) )

=FORMAT(MAX( DATE(YEAR([Дата]);1;1); [Дата]-WEEKDAY([Дата];3) );"DD") & 
 "-" & 
 FORMAT(MIN( DATE(YEAR([Дата]);12;31); [Дата]+7-WEEKDAY([Дата];2) );"DD.MM")

let
    return = (minDate as date, maxDate as date, lang as text) =>
let
    base = Table.FromColumns( {List.Dates( minDate, Duration.Days(maxDate - minDate) + 1, #duration(1, 0, 0, 0) )}, {"Date"}),
    dateType = Table.TransformColumnTypes(base,{{"Date", type date}}),
    addYear = Table.AddColumn(dateType, "Year", each Date.Year(_[Date]), Int64.Type),
    addMonthName = Table.AddColumn(addYear, "Month Name", each Date.ToText(_[Date], "MMMM", lang), type text),
    addWeekdayName = Table.AddColumn(addMonthName, "Weekday Name", each Date.ToText(_[Date], "dddd", lang), type text)
    
in
    addWeekdayName
in
    return

=CALCULATE(
   MIN('Таблица1'[Дата]);
   FILTER(
      ALL('Таблица1'[Дата]);
      'Таблица1'[Номер недели]=EARLIER('Таблица1'[Номер недели])
   )
)

let
    Source = ExcelWorksheetsRowOutlines(FullPath, {"TDSheet"})
in
    Source