Convert isoYearIsoWeek (YYYYWW) into a date

As a week has 7 days - and all ISO weeks have 7 days, also the weeks around New Year - the following query will take you step by step to the start and the end of the week.

This approach is based on the fact that January 4th is always in ISO week number 1.

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    Typed = Table.TransformColumnTypes(Source,{{"isoYearIsoWeek", Int64.Type}}),
    AddedJan_4th = Table.AddColumn(Typed, "Jan_4th", each #date(Number.IntegerDivide([isoYearIsoWeek],100),1,4), type date),
    AddedWeekday_Jan_4th = Table.AddColumn(AddedJan_4th, "Weekday_Jan_4th", each Date.DayOfWeek([Jan_4th],Day.Monday)),
    AddedStartOfWeek1 = Table.AddColumn(AddedWeekday_Jan_4th, "StartOfWeek1", each Date.AddDays([Jan_4th],-[Weekday_Jan_4th]), type date),
    AddedStartOfISOWeek = Table.AddColumn(AddedStartOfWeek1, "StartOfISOWeek", each Date.AddWeeks([StartOfWeek1],Number.Mod([isoYearIsoWeek],100)-1), type date),
    AddedEndOfISOWeek = Table.AddColumn(AddedStartOfISOWeek, "EndOfWeek", each Date.AddDays([StartOfISOWeek],6), type date),
    RemovedColumns = Table.RemoveColumns(AddedEndOfISOWeek,{"Jan_4th", "StartOfWeek1", "Weekday_Jan_4th"})
in
    RemovedColumns