Display the date and time?

Use the template tag, the_time(), in the template that displays your posts.

Stepping Into Template Tags
Stepping Into Templates
Template Hierarchy

Thanks so much Michael =)

You have pointed me in the right direction, hehe. I read the template time WordPress tutorial, however they did not specify on where to put the code. Should I add it to my pages.php / singles.php / or?

And also, where in the page should I put this code?

depends where you want it to show.

index.php for your posts page
page.php for single pages
single.php for individual post page
etc

This is a generalization…..theme’s can be unique
where you put the code depends on where you want it displayed
Mine is next to my categories for instance

<div class="date"><span>Posted by <?php the_author_posts_link(); ?> under <?php the_category(', '); ?> on <?php the_time('F j, Y'); ?> at <?php the_time('g:i a'); ?></span></div>