Most "collected" photographers (i.e. photographers whose prints are collected) whose prints I have seen do not date the image on the front. There are those who do--John Sexton comes to mind--and they typically use the date the negative was made. Usually there is just a signature on the front and a data stamp on the back with information like the date the negative was made, the negative or other reference number or name, the date and number of this particular print, and the name and contact info of the photographer.
Hope this helps!