How do I Modify a document's BuiltIn properties?

Sorry! can i post in this topic?
I want modify some propeties:
wdPropertyRevision (as Creation Date)
wdPropertyTimeCreated (as Revision Number)
and "Total Editing Time"
but this no effect.
How i can write it?

Split into its own thread

you can change some of the document properties like
ActiveDocument.BuiltInDocumentProperties(wdPropertySubject) = "mytest"
but help says they are read only and most can not be changed