IPB post date check

Hi, I'm writing a bot that should let a user log in an IPB forum and do some actions after checking that the right conditions are verified in the user's account's profile. These conditions are: 1) the user must have registered his account before a certain date 2) the user must have posted a message in a defined period of time (between date 1 and date 2) I'm using a set of functions to get infos about the user from the board's db: http://projects.pc-intern.com/index.php?showforum=150 I've been able to verify condition 1, but I don't know what to do about the second, since I cannot seem to find a way to check if a user posted a message on a certain day. Do you have any idea on how I should do this check? Thanks for your help, Luca