I verified the time value is good tonight. I do have a PM receipt. It is always a good idea to have a test forum, so I would do that anyway.
I took the query from the file and ran it in MySQL Query Browser and it did a partial. It actually got rid of the pm receipt, but it did not delete the rest. I'm looking at MySQL syntax right now. Here's the page if you want to take a look.
http://dev.mysql.com/doc/refman/5.0/en/delete.html