'widget_amp_entries', 'description' => __( 'Generates a list of AMP posts in the widget area.'), 'customize_selective_refresh' => true, ); parent::__construct( 'amp-posts', __( 'AMP Recent Posts widget' ), $widget_ops ); $this->alt_option_name = 'widget_amp_entries'; } /** * Outputs the content for the current AMP Posts widget instance. * * @since 2.8.0 * @access public * * @param array $args Display arguments including 'before_title', 'after_title', * 'before_widget', and 'after_widget'. * @param array $instance Settings for the current AMP Posts widget instance. */ public function widget( $args, $instance ) { if ( ! isset( $args['widget_id'] ) ) { $args['widget_id'] = $this->id; } $title = ( ! empty( $instance['title'] ) ) ? $instance['title'] : __( '' ); //* JD add field $append = ( ! empty( $instance['append'] ) ) ? $instance['append'] : __( 'amp' ); /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */ $title = apply_filters( 'widget_title', $title, $instance, $this->id_base ); $number = ( ! empty( $instance['number'] ) ) ? absint( $instance['number'] ) : 5000; if ( ! $number ) $number = 5000; $show_date = isset( $instance['show_date'] ) ? $instance['show_date'] : false; /** * Filter the arguments for the Recent Posts widget. * * @since 3.4.0 * * @see WP_Query::get_posts() * * @param array $args An array of arguments used to retrieve the recent posts. */ $r = new WP_Query( apply_filters( 'widget_posts_args', array( 'posts_per_page' => $number, 'no_found_rows' => true, 'post_status' => 'publish', 'ignore_sticky_posts' => false ) ) ); if ($r->have_posts()) : ?>

Depending on the plugin you use, in case of the AMP plugin by Automattic it's ’amp’.
Ex: www.yoursite.com/somepost/amp.

id="get_field_id( 'show_date' ); ?>" name="get_field_name( 'show_date' ); ?>" />