=ТЕКСТ(--(1&звонки[[#Эта строка];[дата]]);"ММММ")
let from = Excel.CurrentWorkbook(){[Name="звонки"]}[Content], to = Table.TransformColumns(from,{{"дата", each Date.MonthName(Date.From("1"&_&"2020")), type text}}) in to
=Date.ToText( Date.From( "1."&[дата], "RU-ru" ), "MMMM")