date and time same row

Sure it is, can we have a link to your site so that we can give you the correct code to do this?

Im not so great at this but I think you should replace your loop with this:
<div class="meta"> <h2><?php the_date(); ?></h2> // <ul class="post-categories">

• <?php the_category() ?>

— Christian @ <?php the_time(); ?> </div>