Ouch, that one hurts. We got a little framed picture on our wedding day, with the announcement done up in thread and decorations, and of course the date is on it. It is hanging in the bedroom, so every now and then I check it, just to make sure. I have the month for sure in my head, but the date....not always first thing in my memory banks, which are failing with old age, ha ha. This has worked for 25 years.
Have one made up, present it to her for a gift, and as a means of atonement, and then you are set. It is always on the wall. Hope you escape the doghouse soon. Good Luck.