//FUNCTION TO LIMIT SEARCH TO LAST 30 DAYS
<?php function filter_where( $where = '' ) {
$where .= " AND post_date > '" . date('Y-m-d', strtotime('-30 days')) . "'";
return $where;
}
add_filter( 'posts_where', 'filter_where' ); ?>
//THE QUERY AND LOOP
<?php
$query = new WP_Query( array( 'category__not_in' => array( '3', '8', '15' ) ) );
if ( have_posts() ) : ?>
<?php while ( $query->have_posts()) : $query->the_post(); ?>
<h3 class="entry-title"><?php the_title(); ?></h3>
<?php the_content(); ?>
<hr>
<?php endwhile; ?>
<?php endif; ?>
<?php wp_reset_postdata(); ?>
//REMOVE FILTER THAT LIMITS SEARCH TO LAST 30 DAYS
<?php remove_filter( 'posts_where', 'filter_where' ); ?>