In Function ScanFolders(PathSpec) you would need to check the date created for each file against the time frame you select.
Something Like:
Function ScanFolders(PathSpec)
Dim fs, f, Folder, fc, s, File, FileList, FolderInfo, FileName, Name
response.write "<BLOCKQUOTE>"
Set FolderInfo = Fso.GetFolder(PathSpec)
Set FileList = FolderInfo.Files
For Each File in FileList
If File.DateCreated > TimeSelected Then 'TimeSelected being today, this week, month, etc. you would use your favorite date compare function here
' continue processing to output name
Else
' do nothing and continue to next file
EndIf
<