Bonjour,
Une proposition ?
Cdlt.
let
Source = Excel.CurrentWorkbook(){[Name="Tableau1"]}[Content],
Type = Table.TransformColumnTypes(Source,{{"Date", type date}}),
AddDates = Table.AddColumn(Type, "Date révisée",
each if Date.Year([Date])<>[Exercice] then #date([Exercice],12,31) else [Date],type date)
in
AddDates