Snippet: Display “New” Badge for WooCommerce Product

/*
 * Adds a new badge to product entry for any product added in the last 30 days.
 * Simply add to child theme's functions.php file then add some css to your site to style it.
 * If you want the badge to be a part of the "equal height" content then use 'PHP_INT_MAX' for the
 * priority instead of 20
 *
 */
add_action( 'woocommerce_before_shop_loop_item_title', function() {
	$postdate      = get_the_time( 'Y-m-d' ); // Post date
	$postdatestamp = strtotime( $postdate );  // Timestamped post date
	$newness       = 30;                      // Newness in days
	if ( ( time() - ( 60 * 60 * 24 * $newness ) ) < $postdatestamp ) {
		echo '<div class="woo-entry-new-badge">' . esc_html__( 'New', 'total' ) . '</div>';
	}
}, 20 );