<?php
    $this_post = $post;
    $category = get_the_category(); $category = $category[0]; $category = $category->cat_ID;
    $posts = get_posts('numberposts=6&offset=0&orderby=post_date&order=DESC&category='.$category);
    $count = 0;
    foreach ( $posts as $post ) {
    if ( $post->ID == $this_post->ID || $count == 5) {
    unset($posts[$count]);
    }else{
    $count ++;
    }
    }
    ?>

    <?php if ( $posts ) : ?>
    <div class="related_articles">
    <div class="rptitle">Other Posts in this Category</div>
    <ul>
    <?php foreach ( $posts as $post ) : ?>
    <li><a href="<?php the_permalink() ?>" title="<?php echo trim(str_replace("n"," ",preg_replace('#<[^>]*?>#si','',get_the_excerpt()))) ?>"><?php if ( get_the_title() ){ the_title(); }else{ echo "Untitled"; } ?></a> (<?php the_time('F jS, Y') ?>)</li>
    <?php endforeach // $posts as $post ?>
    </ul>
    </div>
    <?php endif // $posts ?>
    <?php
    $post = $this_post;
    unset($this_post);
    ?>