I have tried editing my normal template but am having problems with file name.
I opened normal.dotm and changed margins. I opened the footer and from Insert - Quick Parts - Fields selected File name. Then back in footer I added [space] - [space] and then back in Quick Pats selected Date.
The file name now showed a footer

Normal.dotx - 12 Sept 2016 as I expected and wanted.

Problem is that when I then opened a new blank document, the changed margins were applied, the footer showed but not as expected i.e.

Doc1.docx - 12 Sept 2016
but as
Normal.dotx - 12 Sept 2016 even though the title bar at the top of the screen showed the document name as Doc1.docx
Saving it with a new file name and then re-opening it showed the same wrong file name again.
Any suggestions as to why please?