打开工作簿的最后修改日期

Question

vba新手。需要一个函数来输出打开的工作簿的最后修改日期。这是我到目前为止所拥有的，但是当我调用该函数时，我收到一条消息，指出我的公式包含错误：

Function LastWBModDate(wbname)

    ActivateWB (wbname)
    LastWBModDate = Format(FileDateTime(ActiveWorkbook.FullName), "m/d/yy h:n ampm")

End Function

Public Function ActivateWB(wbname As String)

    If IsWBOpen(wbname) Then
        Workbooks(wbname).Activate
    Else
        MsgBox "Workbook : " & wbname & " is not open " & vbNewLine
    End If

End Function

Public Function IsWBOpen(wbname As String) As Boolean

    On Error Resume Next
    If Workbooks(wbname) Is Nothing Then
        IsWBOpen = False
    Else
        IsWBOpen = True
    End If

End Function

谢谢！

Answer 1

Function LastWBModDate(wbname As String)
Dim rv, wb As Workbook

    rv = "workbook?" 'default return value

    On Error Resume Next
    Set wb = Workbooks(wbname)
    On Error GoTo 0

    If Not wb Is Nothing Then
        rv = Format(FileDateTime(wb.FullName), "m/d/yy h:n ampm")
    End If

    LastWBModDate = rv

End Function