Cartzilla - Single Product Custom "Last update" Date

functions.php

if( ! function_exists( 'cartzilla_wc_product_modified_date' ) ) {
    function cartzilla_wc_product_modified_date() { 
        global $product;
        $updated_date = get_post_meta( $product->get_id(), 'updated_date', true );
        ?>
        <li class="d-flex justify-content-between mb-3 pb-3 border-bottom">
            <span class="text-dark font-weight-medium"><?php echo esc_html('Last update', 'cartzilla'); ?></span>
            <span class="text-muted"><?php echo date( 'F j, Y', strtotime( $updated_date ) ); ?></span>
        </li><?php
    }
}