Permalinks question

Okay, I have membership, affiliate, and Q&A installed on my multisite…site. One theme at the main domain and one theme in a subdirectory. I have my permalinks set as day and name. My question is, should I change to post name and if I do, what do I have to watch out for?

My only thought about changing it is, what if I change the date posted to change the order it’s displayed (as a sorting workaround)? If I have the permalink set as day and post, it will have a url with a date that’s no longer in effect. I guess that wouldn’t matter. But can anyone give me their thoughts on this subject?