Fetch Number of posts in Last 24 hours for WordPress

aa_custom_page.php

<?php /*    Template Name: Test AA    */
 
        get_header(); ?>

		<!-- section -->
		<section class="aa_sec1">

            <?php echo aa_get_posts_count_from_last_24h(); ?>
            <?php echo aa_get_posts_count_from_today(); ?>

		</section>
		<!-- /section -->



<?php //get_sidebar(); ?>

<?php get_footer(); ?>

functions.php

// Load any external files you have here
function aa_get_posts_count_from_last_24h($post_type ='post') {
    global $wpdb;

    $numposts = $wpdb->get_var(
        $wpdb->prepare(
            "SELECT COUNT(ID) ".
            "FROM {$wpdb->posts} ".
            "WHERE ".
                "post_status='publish' ".
                "AND post_type= %s ".
                "AND post_date> %s",
            $post_type, date('Y-m-d H:i:s', strtotime('-24 hours'))
        )
    );
    return $numposts;
}

function aa_get_posts_count_from_today($post_type ='post') {
    global $wpdb;

    $numposts = $wpdb->get_var(
        $wpdb->prepare(
            "SELECT COUNT(ID) ".
            "FROM {$wpdb->posts} ".
            "WHERE post_status='publish' ".
                "AND post_type= %s ".
                "AND DATE_FORMAT(post_date, '%Y-%m-%d') = %s",
            $post_type, date('Y-m-d', time())
        )
    );
    return $numposts;
}