I’ve been meaning to write a blog post about this but it hasn’t happened yet! I’m doing this by writing URLs like this:
/content/{entry_date format="%Y/%m"}/{url_title}/
N.B. Only after doing that did I realise you could just put “/content/{entry_date format="%Y/%m"}/” into the Comment URL path in the Channel preferences, then you can just refer to the {comment_url_title_auto_path} as usual and have the date coming into that. OR I did it that way at first and it didn’t always work - I’m afraid I can’t remember now so you’ll need to try it out yourselves! (Do post what you find up here though for others.)
You’ll need to set up your single page template entries with these parameters, so that it knows where to find the url_title
url_title="{segment_4}"
dynamic="no"
There will probably be other things you need to do for your listings pages and archives and so on but the site I’ve used it on doesn’t have those. I hope this will be enough for you to figure out the rest.
You can see it working here if you’re interested (click on any of the stories on the homepage) http://www.freewordonline.com/