Dates missing on all but newest post

http://jwhathaway.100webcustomers.com/Wordpress/

As you can see, the date of the post only shows up on the most recent post made. (I have confirmed this by adding test posts, same problem.)

The cuplrit seems to be the the_date() function in my theme’s post.php file, which I recently modified. It curently have

<?php the_date(); ?> <?php the_time(); ?>

to print the date and time of the post. Is there some other way I should do this to print the date and time? Is there a file I need to change other than post.php? Any help would be great.