Bonjour,
Option Explicit
Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
Cancel = True
If Target.Column = 2 Then
If Cells(Target.Row, 3) = "" Then
Cells(Target.Row, 3) = Date
Cells(Target.Row, 1).Interior.ColorIndex = 4
Else
Cells(Target.Row, 3) = ""
Cells(Target.Row, 1).Interior.ColorIndex = xlNone
End If
End If
End Sub
A+