Outlook VBA Addin

I found this code snippet on another site: https://www.extendoffice.com/documents/outlook/3747-outlook-auto-download-save-attachments-to-folder.html

This works! Which is great. However I would like to modify this to only grab PDF files from the emails and prepend a date to the file name (yyyymmdd - original filename). I have zero programming knowledge. I have found a few different sites and have tried to modify but it just breaks the code and the script stops working. Any assistance would be appreciated.

Public Sub SaveAttachmentsToDisk(MItem As Outlook.MailItem)
Dim oAttachment As Outlook.Attachment
Dim sSaveFolder As String
sSaveFolder = "C:\Users\DT168\Documents\outlook-attachments\"
For Each oAttachment In MItem.Attachments
oAttachment.SaveAsFile sSaveFolder & oAttachment.DisplayName
Next
End Sub