$current_page_year = get_the_time('Y');
$current_page_month = get_the_time('n');

var_dump($current_page_year);
var_dump($current_page_month);
/*Latest Featured post*/
echo '<div class="newsletter-featured">';

$args = array(
        'cat' => 13,
        'year' => $current_page_year,
        'monthnum' => $current_page_month,
        'showposts' => 1,
        'orderby' => 'date',
        'order' => 'ASC',
    );
$lastposts = get_posts( $args );
foreach ( $lastposts as $post ) :