I remember this problem years ago when I first started using WordPress. It's been so long, that I can't remember exactly how to fix it. Sorry, I also tried searching, but for some reason couldn't find an answer. I remember it being a matter of changing one little thing.
Right now I'm using
<?php the_date(); ?> what do I need to switch it to so that it still displays the day, but allows the date to show up for multiple posts from the same day?