[Steven Zahm]

@ ottomek

re: What would the snippet be to create this text field that only the WP admin could change but it would be read-only/displayed with each Members Profile Directory area.

The following snippet should do the trick.

// Register the metabox and field.
add_action( 'cn_metabox', 'cn_register_custom_metabox_and_date_field' );

function cn_register_custom_metabox_and_date_field() {

    $atts = array(
        'title'    => 'Expiration Date',         // Change this to a name which applies to your project.
        'id'       => 'expiration_date_metabox', // Change this so it is unique to you project.
        'context'  => 'normal',
        'priority' => 'core',
        'fields'   => array(
            array(
                'name'       => 'Date',            // Change this field name to something which applies to you project.
                'show_label' => TRUE,              // Whether or not to display the 'name'. Changing it to false will suppress the name.
                'id'         => 'expiration_date', // Change this so it is unique to you project. Each field id MUST be unique.
                'type'       => 'datepicker',      // This is the field type being added.
            ),
        ),
    );

    if ( is_admin() && current_user_can( 'manage_options' ) ) cnMetaboxAPI::add( $atts );
}

Hope that helps!