This would be a great feature to have and I hope it is coming. There are ways around this - resetting the date every time obviously - but that is a hassle that usually causes one to forget about the whole thing. If one could set an automatic reminder, say, every week, for a particular note, that would be most handy.
So what is the best way to let the Evernote people know this would be a good addition? Do they read the forums? I have no idea.