Save Outlook attachment to a folder and Rename the file with date - vba

Question

I'm trying to save the daily system generated report attached to the e-mail to a folder.
Then, append the attachment filename with the date (modified date in the file). I am able to get the file saved to a folder. However, the renaming piece doesn't seem to work for me.
Can someone please help why the renaming piece isn't working? Much Thanks!
Public Sub saveAttachtoBIFolder(itm As Outlook.MailItem)
Dim objAtt As Outlook.Attachment
Dim saveFolder As String
Dim fso As Object
Dim oldName As Object
Dim file As String
Dim DateFormat As String
Dim newName As Object
saveFolder = "C:\BI Reports"
Set fso = CreateObject("Scripting.FileSystemObject")
On Error Resume Next
For Each objAtt In itm.Attachments
file = saveFolder & "\" & objAtt.DisplayName
objAtt.SaveAsFile file
Debug.Print "file="; file ' the full file path printed on immediate screen
Set oldName = fso.GetFile(file) ' issue seems to start from here
DateFormat = Format(oldName.DateLastModified, "yyyy-mm-dd ")
newName = DateFormat & objAtt.DisplayName
oldName.Name = newName
Debug.Print "DateFormat="; DateFormat 'the date format printed on the immediate screen
Set objAtt = Nothing
Next
Set fso = Nothing
End Sub

Answer 1

Your newName needs to be string NOT Object so Dim newName As String also I would assign objAtt.DisplayName to string variable
See Example
Set FSO = CreateObject("Scripting.FileSystemObject")
For Each objAtt In itm.Attachments
File = saveFolder & "\" & objAtt.DisplayName
objAtt.SaveAsFile File
Debug.Print File ' the full file path printed on immediate screen
Set oldName = FSO.GetFile(File) ' issue seems to start from here
Debug.Print oldName
Dim newName As String
Dim AtmtName As String
AtmtName = objAtt.DisplayName
Debug.Print AtmtName
DateFormat = Format(oldName.DateLastModified, "yyyy-mm-dd ")
Debug.Print DateFormat
newName = DateFormat & " " & AtmtName
oldName.Name = newName
Debug.Print newName 'the date format printed on the immediate screen
Next