I have a WordPress 3.1.3 site that was hacked, so I decided to rebuild it from scratch with 3.3.1. I will manually port the old posts. The problem is that the prior pretty-URLs had a year/mongth/ format, and now the new site is incapable of producing the "year/month" that my older posts had.
In other words, when I'm done, all inbound links will be broken. How can I "hack" the new site, so that the year/month portion of the slug reflects some time far in the past (two years ago, etc)?
I figure I have to visit a table in my database, but which one? What column?
Why is the new site incapable of the same permalink structure? Why not import the old database?
Try the plugin WordPress › Redirection « WordPress Plugins; import a CSV of your old and new slugs if possible.