a better way in my opinion is to enter it into the custom box feature manually. Might be tedious to remember to do it everyday , but it doesn't disappear, and the text size can be customized, and be entered in any format (mm/dd/yyyy) you want.
this is just my insight. Do whatever you want. You may know about it or just haven't realized it yet. Just bringing it into the light as I believe it is one of those forgotten features.