Dates are the same, shouldn’t be

I’m using WordPress blog as sort of a content management system where it’s never published, or online, but I feed the content into a webpage on my basketball site. I’m going to be having 60-70 users enter scores for area basketball teams and when they publish their post it will automatically get updated on my “Scores” page within the website.

I’m testing it right now and everything is working fine except one thing. Yesterday I posted 5 fake games and their scores. The date was 9/19/06.

I went in today, registered myself as a user, pretending to be one of the other users, and posted another game score. I went to my Scores page where the blog feeds into and the date for the new post was right, but the five posts from yesterday, their dates all changed to 9/20/06. I, of course, don’t want that to happen. I want those earlier dates to reflect when that game was played. What am I doing wrong? Thanks

http://section4hoops.com/rss_scores.php