if ($previous_post->post_date) { ?>
día anterior, echo (strftime("%A, %e de %B", strtotime($previous_post->post_date))); ?>
} ?>
< < <
echo (strftime("%A, %e de %B", strtotime($post->post_date))); ?>
> > >
if ($next_post) { ?>
día siguiente, echo (strftime("%A, %e de %B", strtotime($next_post->post_date))); ?>
} else { ?>
visitanos y lo verás ;-)
mañana, echo (strftime("%A, %e de %B", strtotime($post->post_date)+86400)); ?>
} ?>