let
Source = Excel.CurrentWorkbook(){[Name="Calendrier"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Dates", type date}, {"Mois (text)", type text}, {"jour (text)", type text}}),
#"Grouped Rows" = Table.Group(#"Changed Type", {"Mois (text)"},
{{"data", each fctn_add_index(_),
type table
[ Dates=nullable date,
#"Mois (text)"=nullable text,
#"jour (text)"=nullable text,
Index= Int64.Type
]
}})
in
#"Grouped Rows"