bonjour,
une proposition
Sub par30()
Set ws = Sheets.Add
With Sheets("test")
.Range("A1").Resize(, 3).Copy ws.Range("A1")
ws.Columns(1).NumberFormat = "dd/mm/yy"
ws.Columns(2).NumberFormat = "hh:mm"
k = 1
dl = .Cells(Rows.Count, 1).End(xlUp).Row
For i = 2 To dl Step 6
k = k + 1
ws.Cells(k, 1) = .Cells(i, 1)
ws.Cells(k, 2) = .Cells(i + 5, 2)
ws.Cells(k, 3) = Round(Application.WorksheetFunction.Average(.Cells(i, 3).Resize(6, 1)) / 1000, 1)
Next i
End With
End Sub