Get last shutdown time

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VB

how to get the time of pc before the shutdown !! and thanks!!!

i found this

Private Sub button1_Click(sender As Object, e As EventArgs)
    MessageBox.Show(GetLastSystemShutdown().ToString())
End Sub

Public Shared Function GetLastSystemShutdown() As DateTime
    Dim sKey As String = "System\CurrentControlSet\Control\Windows"
    Dim key As Microsoft.Win32.RegistryKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(sKey)

    Dim sValueName As String = "ShutdownTime"
    Dim val As Byte() = DirectCast(key.GetValue(sValueName), Byte())
    Dim valueAsLong As Long = BitConverter.ToInt64(val, 0)
    Return DateTime.FromFileTime(valueAsLong)
End Function

but this it's gives you the result after the shutdown !! all what i want is to have the last time before the bigin of shutdown and thanks alot