Thank you. I have sent a note to Flavio. You are indeed correct that the date is a simple one. To explain myself, if I must, I converted the date myself. But I also have a habit of verifying my own calculations on an automated converter site. It is at
http://www.guernsey.net/~sgibbs/roman.html and it
usually works very well. However, the input MXM was rejected as invalid. Please try it out yourself. So my posting here was more a confirmation of my own calculation of (indeed!) a very simple thing.
Thank you.