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<?php
//https://wp-kama.ru/function/wp_query#parametry-daty-vremeni
?>
<!-- the most popular START -->
	<div class="widget">
		<h3>Интересные материалы</h3>

		<!-- previews -->
		<?php
		// args
		wp_reset_postdata();

		// Создадим новую функцию которая добавит условие where в запрос
		function filter_where( $where = '' ) {
			// за последние 30 дней
			$where .= " AND post_date > '" . date('Y-m-d', strtotime('-30 days')) . "'";
			return $where;
		}
		add_filter( 'posts_where', 'filter_where' );

		$args = array(
        	'cat'    => 0,
        	'showposts' => 5,
        	'meta_key'   => 'post_views_count',
        	'orderby'   => 'meta_value_num',
	    );
		$the_query = new WP_Query( $args );
		remove_filter( 'posts_where', 'filter_where' );
		?>

		<!-- 3009 -->
		<?php if( $the_query->have_posts() ): ?>
			<ul class="previews-list">
		<?php while ($the_query->have_posts()) : $the_query->the_post(); ?>
			<li>
				<!-- post date -->
				<!-- <?php echo get_the_date(); ?> -->
				<a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">
					<?php
					if ( has_post_thumbnail() ) { ?>
						<div class="preview-img">
							<?php the_post_thumbnail( array( 68, 68, 'bfi_thumb' => true ) ); ?>
						</div>
					<?php } ?>
					<div class="preview-text"><?php the_title(); ?></div>
				</a>
			</li>
		<?php endwhile; ?>
		</ul>
		<?php endif; ?>
		<!-- 3009 -->
		<!-- the most popular END -->
		<?php wp_reset_query();  // Restore global post data stomped by the_post(). ?>