Replace date and time at end of posts

We would like to modify the date time showing at end of posts from something like this:
Posted on February 3, 2010 at 3:58 pm.

to something like this:
Posted on February 3, 2010.

Any help would be appreciated. I am assuming it will involve changing this line in category.php, but have not had any luck.

<div class="entry-date">Date Published: <abbr class="published" title="<?php the_time('Y-m-d\TH:i:sO') ?>"><?php unset($previousday); printf( __( '%1$s – %2$s', 'sandbox' ), the_date( '', '', '', false ), get_the_time() ) ?></abbr></div>